Thrombosis

The European Medicines Agency continues to reassure the public about the safety of the AstraZeneca COVID-19 vaccine, although several countries have imposed new restrictions on the product, owing to its link to a rare clotting disorder.

Use of the vaccine has been suspended for individuals younger than 55 or 60 years in several European countries and in Canada after reports of a prothrombotic disorder and thrombocytopenia, mainly in younger individuals.

Now, more information on the prothrombotic disorder has become available. The vaccine appears to be linked to a condition that clinically resembles heparin-induced thrombocytopenia (HIT) and that occurs mainly in younger women.

Researchers have described clinical and laboratory details of nine patients from Germany and Austria who developed this condition 4-16 days after receiving the AstraZeneca vaccine in a preprint article published March 28, 2021, on Research Square.

They found that serum from four patients who were tested showed platelet-activating antibodies directed against platelet factor 4 (PF4), similar to what is seen in HIT.

They are proposing naming the condition “vaccine-induced prothrombotic immune thrombocytopenia (VIPIT)” to avoid confusion with HIT.

At a press conference March 31, the EMA said its ongoing review of the situation “has not identified any specific risk factors, such as age, gender, or a previous medical history of clotting disorders, for these very rare events. A causal link with the vaccine is not proven but is possible, and further analysis is continuing.”

A statement from the agency noted: “EMA is of the view that the benefits of the AstraZeneca vaccine in preventing COVID-19, with its associated risk of hospitalization and death, outweigh the risks of side effects.”

But it added: “Vaccinated people should be aware of the remote possibility of these very rare types of blood clots occurring. If they have symptoms suggestive of clotting problems as described in the product information, they should seek immediate medical attention and inform health care professionals of their recent vaccination.”
 

VIPIT study

In the Research Square preprint article, a group led by Andreas Greinacher, MD, professor of transfusion medicine at the Greifswald (Germany) University Clinic, reported on clinical and laboratory features of nine patients (eight of whom were women) in Germany and Austria who developed thrombosis and thrombocytopenia after they received the AstraZeneca vaccine.

The researchers explained that they investigated whether these patients could have a prothrombotic disorder caused by platelet-activating antibodies directed against PF4, which is known to be caused by heparin and sometimes environmental triggers.

The nine patients were aged 22-49 years and presented with thrombosis beginning 4-16 days post vaccination. Seven patients had cerebral venous thrombosis (CVT), one had pulmonary embolism, and one had splanchnic vein thrombosis and CVT. Four patients died. None had received heparin prior to symptom onset.

Serum from four patients was tested for anti-PF4/heparin antibodies, and all four tested strongly positive. All four also tested strongly positive on platelet activation assay for the presence of PF4 independently of heparin.

The authors noted that it has been recognized that triggers other than heparin, including some infections, can rarely cause a disorder that strongly resembles HIT. These cases have been referred to as spontaneous HIT syndrome.

They said that their current findings have several important clinical implications.

“Clinicians should be aware that onset of (venous or arterial) thrombosis particularly at unusual sites such as in the brain or abdomen and thrombocytopenia beginning approximately 5-14 days after vaccination can represent a rare adverse effect of preceding COVID-19 vaccination,” they wrote. To date, this has only been reported with the AstraZeneca vaccine.

They pointed out that enzyme immunoassays for HIT are widely available and can be used to investigate for potential postvaccination anti-PF4 antibody–associated thrombocytopenia/thrombosis. For such patients, referral should be made to a laboratory that performs platelet-activation assays.

Although this syndrome differs from typical HIT, the researchers noted that at least one patient showed strong platelet activation in the presence of heparin. They thus recommended therapy with nonheparin anticoagulants, such as the direct oral anticoagulants.

They also wrote that high-dose intravenous immunoglobulin has been shown to be effective for treating severe HIT and could also be an important treatment adjunct for patients who develop life-threatening thrombotic events, such as cerebral vein sinus thrombosis (CVST), after being vaccinated.
 

EMA data to date

Updated data, reported at the EMA press briefing on March 31, indicate that 62 cases of CVST have been reported worldwide (44 from the European Union). These data may not yet include all the German cases.

Peter Arlett, MD, head of pharmacovigilance and epidemiology at the EMA, said there were more cases than expected in the 2-week window after vaccination among patients younger than 60 and that health care professionals should be alert to features of this condition, including headache and blurred vision.

He suggested that the higher rate of the condition among younger women may reflect the population that received this vaccine, because initially, the vaccine was not recommended for older people in many countries and was targeted toward younger health care workers, who were mainly women.

The German regulatory agency, the Paul Ehrlich Institute, reported this week that it has now registered 31 cases of CVST among nearly 2.7 million people who had received the vaccine in Germany. Of these patients, 19 also were found to have a deficiency of blood platelets or thrombocytopenia. Nine of the affected patients died. All but two of the cases occurred in women aged 20-63 years. The two men were aged 36 and 57 years.

These data have prompted the German authorities to limit use of the AstraZeneca vaccine to those aged 60 years and older. Even before this decision, senior clinicians in Germany had been urging a change in the vaccination recommendations.

For example, Bernd Salzberger, MD, head of infectious diseases, University Hospital Regensburg (Germany), told the Science Media Center: “In women, a complicated course of COVID disease is less common from the start and is so rare in younger women that the chance of avoiding a fatal course through vaccination in women without comorbidities is of the same order of magnitude as the risk of this rare side effect.”

Sandra Ciesek, MD, a virologist at Goethe University, Frankfurt, Germany, told the journal Science: “The argument I keep hearing is that the risk-benefit ratio is still positive. But we do not have just one vaccine, we have several. So, restricting the AstraZeneca vaccine to older people makes sense to me, and it does not waste any doses.”
 

Concerns put in perspective

Commenting of the latest developments, thrombosis expert Saskia Middeldorp, MD, head of internal medicine at Radboud University Medical Center, Nijmegen, the Netherlands, said it was vitally important that these concerns be put in perspective and that the vaccination program with the AstraZeneca product continue.

“There are some concerning reports about very rare blood clotting disorders and low platelet counts possibly associated with the AstraZeneca vaccine. Groups from Germany and Norway have identified a syndrome similar to HIT, which seems to explain the cause of this very rare side effect,” Dr. Middeldorp noted.

“But with such a high pressure from the virus and many countries now going into a third wave of infection, anything that might slow down vaccination rates will cause much more harm than good,” she warned.

Dr. Middeldorp believes the incidence of this HIT-type syndrome linked to the vaccine is about 1-2 per million. “These are estimates based on the number of reports of this side effect and denominators from the U.K. and EU populations,” she explained. However, Germany has restricted the vaccine on the basis of German data, which appear to show higher rates of the condition. It is not known why the rates are higher in Germany.

“The European Medicines Agency is looking at this very closely. Their statement is quite clear. There is no foundation for changing policy on vaccination,” Dr. Middeldorp stated.

She cautioned that these reports were reducing confidence in the AstraZeneca vaccine, particularly among young people, which she said was causing “a major setback” for the vaccination program.

Noting that everything must be viewed in the context of this severe pandemic, Dr. Middeldorp emphasized that the benefit of the vaccine outweighed any risk, even among young people.

“To those who may be hesitating to have the vaccine as they don’t think they are at high risk of severe COVID infection, I would say there are a lot of young people in the ICU at present with COVID, and your chance of a severe COVID illness is far higher than the 1 or 2 in a million risk of a severe reaction to the vaccine,” she stated.

Dr. Greinacher has received grants and nonfinancial support from Aspen, Boehringer Ingelheim, Merck Sharp & Dohme, Bristol-Myers Squibb, Paringenix, Bayer Healthcare, Gore, Rovi, Sagent, and Biomarin/Prosensa; personal fees from Aspen, Boehringer Ingelheim, Merck Sharp & Dohme, Macopharma, Bristol-Myers Squibb, Chromatec, and Instrumentation Laboratory; and nonfinancial support from Boehringer Ingelheim, Portola, Ergomed, and GTH outside the submitted work.

A version of this article first appeared on Medscape.com.

The European Medicines Agency continues to reassure the public about the safety of the AstraZeneca COVID-19 vaccine, although several countries have imposed new restrictions on the product, owing to its link to a rare clotting disorder.

Use of the vaccine has been suspended for individuals younger than 55 or 60 years in several European countries and in Canada after reports of a prothrombotic disorder and thrombocytopenia, mainly in younger individuals.

Now, more information on the prothrombotic disorder has become available. The vaccine appears to be linked to a condition that clinically resembles heparin-induced thrombocytopenia (HIT) and that occurs mainly in younger women.

Researchers have described clinical and laboratory details of nine patients from Germany and Austria who developed this condition 4-16 days after receiving the AstraZeneca vaccine in a preprint article published March 28, 2021, on Research Square.

They found that serum from four patients who were tested showed platelet-activating antibodies directed against platelet factor 4 (PF4), similar to what is seen in HIT.

They are proposing naming the condition “vaccine-induced prothrombotic immune thrombocytopenia (VIPIT)” to avoid confusion with HIT.

At a press conference March 31, the EMA said its ongoing review of the situation “has not identified any specific risk factors, such as age, gender, or a previous medical history of clotting disorders, for these very rare events. A causal link with the vaccine is not proven but is possible, and further analysis is continuing.”

A statement from the agency noted: “EMA is of the view that the benefits of the AstraZeneca vaccine in preventing COVID-19, with its associated risk of hospitalization and death, outweigh the risks of side effects.”

But it added: “Vaccinated people should be aware of the remote possibility of these very rare types of blood clots occurring. If they have symptoms suggestive of clotting problems as described in the product information, they should seek immediate medical attention and inform health care professionals of their recent vaccination.”
 

VIPIT study

In the Research Square preprint article, a group led by Andreas Greinacher, MD, professor of transfusion medicine at the Greifswald (Germany) University Clinic, reported on clinical and laboratory features of nine patients (eight of whom were women) in Germany and Austria who developed thrombosis and thrombocytopenia after they received the AstraZeneca vaccine.

The researchers explained that they investigated whether these patients could have a prothrombotic disorder caused by platelet-activating antibodies directed against PF4, which is known to be caused by heparin and sometimes environmental triggers.

The nine patients were aged 22-49 years and presented with thrombosis beginning 4-16 days post vaccination. Seven patients had cerebral venous thrombosis (CVT), one had pulmonary embolism, and one had splanchnic vein thrombosis and CVT. Four patients died. None had received heparin prior to symptom onset.

Serum from four patients was tested for anti-PF4/heparin antibodies, and all four tested strongly positive. All four also tested strongly positive on platelet activation assay for the presence of PF4 independently of heparin.

The authors noted that it has been recognized that triggers other than heparin, including some infections, can rarely cause a disorder that strongly resembles HIT. These cases have been referred to as spontaneous HIT syndrome.

They said that their current findings have several important clinical implications.

“Clinicians should be aware that onset of (venous or arterial) thrombosis particularly at unusual sites such as in the brain or abdomen and thrombocytopenia beginning approximately 5-14 days after vaccination can represent a rare adverse effect of preceding COVID-19 vaccination,” they wrote. To date, this has only been reported with the AstraZeneca vaccine.

They pointed out that enzyme immunoassays for HIT are widely available and can be used to investigate for potential postvaccination anti-PF4 antibody–associated thrombocytopenia/thrombosis. For such patients, referral should be made to a laboratory that performs platelet-activation assays.

Although this syndrome differs from typical HIT, the researchers noted that at least one patient showed strong platelet activation in the presence of heparin. They thus recommended therapy with nonheparin anticoagulants, such as the direct oral anticoagulants.

They also wrote that high-dose intravenous immunoglobulin has been shown to be effective for treating severe HIT and could also be an important treatment adjunct for patients who develop life-threatening thrombotic events, such as cerebral vein sinus thrombosis (CVST), after being vaccinated.
 

EMA data to date

Updated data, reported at the EMA press briefing on March 31, indicate that 62 cases of CVST have been reported worldwide (44 from the European Union). These data may not yet include all the German cases.

Peter Arlett, MD, head of pharmacovigilance and epidemiology at the EMA, said there were more cases than expected in the 2-week window after vaccination among patients younger than 60 and that health care professionals should be alert to features of this condition, including headache and blurred vision.

He suggested that the higher rate of the condition among younger women may reflect the population that received this vaccine, because initially, the vaccine was not recommended for older people in many countries and was targeted toward younger health care workers, who were mainly women.

The German regulatory agency, the Paul Ehrlich Institute, reported this week that it has now registered 31 cases of CVST among nearly 2.7 million people who had received the vaccine in Germany. Of these patients, 19 also were found to have a deficiency of blood platelets or thrombocytopenia. Nine of the affected patients died. All but two of the cases occurred in women aged 20-63 years. The two men were aged 36 and 57 years.

These data have prompted the German authorities to limit use of the AstraZeneca vaccine to those aged 60 years and older. Even before this decision, senior clinicians in Germany had been urging a change in the vaccination recommendations.

For example, Bernd Salzberger, MD, head of infectious diseases, University Hospital Regensburg (Germany), told the Science Media Center: “In women, a complicated course of COVID disease is less common from the start and is so rare in younger women that the chance of avoiding a fatal course through vaccination in women without comorbidities is of the same order of magnitude as the risk of this rare side effect.”

Sandra Ciesek, MD, a virologist at Goethe University, Frankfurt, Germany, told the journal Science: “The argument I keep hearing is that the risk-benefit ratio is still positive. But we do not have just one vaccine, we have several. So, restricting the AstraZeneca vaccine to older people makes sense to me, and it does not waste any doses.”
 

Concerns put in perspective

Commenting of the latest developments, thrombosis expert Saskia Middeldorp, MD, head of internal medicine at Radboud University Medical Center, Nijmegen, the Netherlands, said it was vitally important that these concerns be put in perspective and that the vaccination program with the AstraZeneca product continue.

“There are some concerning reports about very rare blood clotting disorders and low platelet counts possibly associated with the AstraZeneca vaccine. Groups from Germany and Norway have identified a syndrome similar to HIT, which seems to explain the cause of this very rare side effect,” Dr. Middeldorp noted.

“But with such a high pressure from the virus and many countries now going into a third wave of infection, anything that might slow down vaccination rates will cause much more harm than good,” she warned.

Dr. Middeldorp believes the incidence of this HIT-type syndrome linked to the vaccine is about 1-2 per million. “These are estimates based on the number of reports of this side effect and denominators from the U.K. and EU populations,” she explained. However, Germany has restricted the vaccine on the basis of German data, which appear to show higher rates of the condition. It is not known why the rates are higher in Germany.

“The European Medicines Agency is looking at this very closely. Their statement is quite clear. There is no foundation for changing policy on vaccination,” Dr. Middeldorp stated.

She cautioned that these reports were reducing confidence in the AstraZeneca vaccine, particularly among young people, which she said was causing “a major setback” for the vaccination program.

Noting that everything must be viewed in the context of this severe pandemic, Dr. Middeldorp emphasized that the benefit of the vaccine outweighed any risk, even among young people.

“To those who may be hesitating to have the vaccine as they don’t think they are at high risk of severe COVID infection, I would say there are a lot of young people in the ICU at present with COVID, and your chance of a severe COVID illness is far higher than the 1 or 2 in a million risk of a severe reaction to the vaccine,” she stated.

Dr. Greinacher has received grants and nonfinancial support from Aspen, Boehringer Ingelheim, Merck Sharp & Dohme, Bristol-Myers Squibb, Paringenix, Bayer Healthcare, Gore, Rovi, Sagent, and Biomarin/Prosensa; personal fees from Aspen, Boehringer Ingelheim, Merck Sharp & Dohme, Macopharma, Bristol-Myers Squibb, Chromatec, and Instrumentation Laboratory; and nonfinancial support from Boehringer Ingelheim, Portola, Ergomed, and GTH outside the submitted work.

A version of this article first appeared on Medscape.com.

The European Medicines Agency continues to reassure the public about the safety of the AstraZeneca COVID-19 vaccine, although several countries have imposed new restrictions on the product, owing to its link to a rare clotting disorder.

Use of the vaccine has been suspended for individuals younger than 55 or 60 years in several European countries and in Canada after reports of a prothrombotic disorder and thrombocytopenia, mainly in younger individuals.

Now, more information on the prothrombotic disorder has become available. The vaccine appears to be linked to a condition that clinically resembles heparin-induced thrombocytopenia (HIT) and that occurs mainly in younger women.

Researchers have described clinical and laboratory details of nine patients from Germany and Austria who developed this condition 4-16 days after receiving the AstraZeneca vaccine in a preprint article published March 28, 2021, on Research Square.

They found that serum from four patients who were tested showed platelet-activating antibodies directed against platelet factor 4 (PF4), similar to what is seen in HIT.

They are proposing naming the condition “vaccine-induced prothrombotic immune thrombocytopenia (VIPIT)” to avoid confusion with HIT.

At a press conference March 31, the EMA said its ongoing review of the situation “has not identified any specific risk factors, such as age, gender, or a previous medical history of clotting disorders, for these very rare events. A causal link with the vaccine is not proven but is possible, and further analysis is continuing.”

A statement from the agency noted: “EMA is of the view that the benefits of the AstraZeneca vaccine in preventing COVID-19, with its associated risk of hospitalization and death, outweigh the risks of side effects.”

But it added: “Vaccinated people should be aware of the remote possibility of these very rare types of blood clots occurring. If they have symptoms suggestive of clotting problems as described in the product information, they should seek immediate medical attention and inform health care professionals of their recent vaccination.”
 

VIPIT study

In the Research Square preprint article, a group led by Andreas Greinacher, MD, professor of transfusion medicine at the Greifswald (Germany) University Clinic, reported on clinical and laboratory features of nine patients (eight of whom were women) in Germany and Austria who developed thrombosis and thrombocytopenia after they received the AstraZeneca vaccine.

The researchers explained that they investigated whether these patients could have a prothrombotic disorder caused by platelet-activating antibodies directed against PF4, which is known to be caused by heparin and sometimes environmental triggers.

The nine patients were aged 22-49 years and presented with thrombosis beginning 4-16 days post vaccination. Seven patients had cerebral venous thrombosis (CVT), one had pulmonary embolism, and one had splanchnic vein thrombosis and CVT. Four patients died. None had received heparin prior to symptom onset.

Serum from four patients was tested for anti-PF4/heparin antibodies, and all four tested strongly positive. All four also tested strongly positive on platelet activation assay for the presence of PF4 independently of heparin.

The authors noted that it has been recognized that triggers other than heparin, including some infections, can rarely cause a disorder that strongly resembles HIT. These cases have been referred to as spontaneous HIT syndrome.

They said that their current findings have several important clinical implications.

“Clinicians should be aware that onset of (venous or arterial) thrombosis particularly at unusual sites such as in the brain or abdomen and thrombocytopenia beginning approximately 5-14 days after vaccination can represent a rare adverse effect of preceding COVID-19 vaccination,” they wrote. To date, this has only been reported with the AstraZeneca vaccine.

They pointed out that enzyme immunoassays for HIT are widely available and can be used to investigate for potential postvaccination anti-PF4 antibody–associated thrombocytopenia/thrombosis. For such patients, referral should be made to a laboratory that performs platelet-activation assays.

Although this syndrome differs from typical HIT, the researchers noted that at least one patient showed strong platelet activation in the presence of heparin. They thus recommended therapy with nonheparin anticoagulants, such as the direct oral anticoagulants.

They also wrote that high-dose intravenous immunoglobulin has been shown to be effective for treating severe HIT and could also be an important treatment adjunct for patients who develop life-threatening thrombotic events, such as cerebral vein sinus thrombosis (CVST), after being vaccinated.
 

EMA data to date

Updated data, reported at the EMA press briefing on March 31, indicate that 62 cases of CVST have been reported worldwide (44 from the European Union). These data may not yet include all the German cases.

Peter Arlett, MD, head of pharmacovigilance and epidemiology at the EMA, said there were more cases than expected in the 2-week window after vaccination among patients younger than 60 and that health care professionals should be alert to features of this condition, including headache and blurred vision.

He suggested that the higher rate of the condition among younger women may reflect the population that received this vaccine, because initially, the vaccine was not recommended for older people in many countries and was targeted toward younger health care workers, who were mainly women.

The German regulatory agency, the Paul Ehrlich Institute, reported this week that it has now registered 31 cases of CVST among nearly 2.7 million people who had received the vaccine in Germany. Of these patients, 19 also were found to have a deficiency of blood platelets or thrombocytopenia. Nine of the affected patients died. All but two of the cases occurred in women aged 20-63 years. The two men were aged 36 and 57 years.

These data have prompted the German authorities to limit use of the AstraZeneca vaccine to those aged 60 years and older. Even before this decision, senior clinicians in Germany had been urging a change in the vaccination recommendations.

For example, Bernd Salzberger, MD, head of infectious diseases, University Hospital Regensburg (Germany), told the Science Media Center: “In women, a complicated course of COVID disease is less common from the start and is so rare in younger women that the chance of avoiding a fatal course through vaccination in women without comorbidities is of the same order of magnitude as the risk of this rare side effect.”

Sandra Ciesek, MD, a virologist at Goethe University, Frankfurt, Germany, told the journal Science: “The argument I keep hearing is that the risk-benefit ratio is still positive. But we do not have just one vaccine, we have several. So, restricting the AstraZeneca vaccine to older people makes sense to me, and it does not waste any doses.”
 

Concerns put in perspective

Commenting of the latest developments, thrombosis expert Saskia Middeldorp, MD, head of internal medicine at Radboud University Medical Center, Nijmegen, the Netherlands, said it was vitally important that these concerns be put in perspective and that the vaccination program with the AstraZeneca product continue.

“There are some concerning reports about very rare blood clotting disorders and low platelet counts possibly associated with the AstraZeneca vaccine. Groups from Germany and Norway have identified a syndrome similar to HIT, which seems to explain the cause of this very rare side effect,” Dr. Middeldorp noted.

“But with such a high pressure from the virus and many countries now going into a third wave of infection, anything that might slow down vaccination rates will cause much more harm than good,” she warned.

Dr. Middeldorp believes the incidence of this HIT-type syndrome linked to the vaccine is about 1-2 per million. “These are estimates based on the number of reports of this side effect and denominators from the U.K. and EU populations,” she explained. However, Germany has restricted the vaccine on the basis of German data, which appear to show higher rates of the condition. It is not known why the rates are higher in Germany.

“The European Medicines Agency is looking at this very closely. Their statement is quite clear. There is no foundation for changing policy on vaccination,” Dr. Middeldorp stated.

She cautioned that these reports were reducing confidence in the AstraZeneca vaccine, particularly among young people, which she said was causing “a major setback” for the vaccination program.

Noting that everything must be viewed in the context of this severe pandemic, Dr. Middeldorp emphasized that the benefit of the vaccine outweighed any risk, even among young people.

“To those who may be hesitating to have the vaccine as they don’t think they are at high risk of severe COVID infection, I would say there are a lot of young people in the ICU at present with COVID, and your chance of a severe COVID illness is far higher than the 1 or 2 in a million risk of a severe reaction to the vaccine,” she stated.

Dr. Greinacher has received grants and nonfinancial support from Aspen, Boehringer Ingelheim, Merck Sharp & Dohme, Bristol-Myers Squibb, Paringenix, Bayer Healthcare, Gore, Rovi, Sagent, and Biomarin/Prosensa; personal fees from Aspen, Boehringer Ingelheim, Merck Sharp & Dohme, Macopharma, Bristol-Myers Squibb, Chromatec, and Instrumentation Laboratory; and nonfinancial support from Boehringer Ingelheim, Portola, Ergomed, and GTH outside the submitted work.

A version of this article first appeared on Medscape.com.

Direct oral anticoagulants (DOACs) are used in about 1% of patients undergoing surgical mechanical aortic and mitral valve replacement, but in up to 6% of surgical bioprosthetic valve replacements, according to registry data presented at CRT 2021.

In an analysis of the Society of Thoracic Surgery (STS) registry during 2014-2017, DOAC use increased steadily among those undergoing surgical bioprosthetic valve replacement, reaching a number that is potentially clinically significant, according to Ankur Kalra, MD, an interventional cardiologist at Akron General Hospital who has an academic appointment at the Cleveland Clinic.

There was no increase in the use of DOACs observed among patients undergoing mechanical valve replacement, “but even if the number is 1%, they should probably not be used at all until we accrue more data,” Dr. Kalra said.
 

DOACs discouraged in patients with mechanical or bioprosthetic valves

In Food and Drug Administration labeling, DOACs are contraindicated or not recommended. This can be traced to the randomized RE-ALIGN trial, which was stopped prematurely due to evidence of harm from a DOAC, according to Dr. Kalra.

In RE-ALIGN, which enrolled patients undergoing mechanical aortic or mitral valve replacement, dabigatran was associated not only with more bleeding events than warfarin, but also more thromboembolic events.

There are no randomized data comparing the factor Xa inhibitors rivaroxaban or apixaban to warfarin in heart valve surgery, but Dr. Kalra noted cautionary language is found in the labeling of both, “perhaps due to the RE-ALIGN data.”
 

Registry shows trends in prescribing

In the STS registry data, 193 (1.1%) of the 18,142 patients undergoing mechanical aortic valve surgery, 139 (1.0%) of the 13,942 patients undergoing mechanical mitral valve surgery, 5,625 (4.7%) of the 116,203 patients undergoing aortic bioprosthetic aortic valve surgery, and 2,180 (5.9%) of the 39,243 patients undergoing bioprosthetic mitral valve surgery were on a DOAC at discharge.

Among those receiving a mechanical value and placed on a DOAC, about two-thirds were on a factor Xa inhibitor rather than dabigatran. For those receiving a bioprosthetic value, the proportion was greater than 80%. Dr. Kalra speculated that the RE-ALIGN trial might be the reason factor Xa inhibitors were favored.

In both types of valves, whether mechanical or bioprosthetic, more comorbidities predicted a greater likelihood of receiving a DOAC rather than warfarin. For those receiving mechanical values, the comorbidities with a significant association with greater DOAC use included hypertension (P = .003), dyslipidemia (P = .02), arrhythmia (P < .001), and peripheral arterial disease (P < 0.001).

The same factors were significant for predicting increased likelihood of a DOAC following bioprosthetic valve replacement, but there were additional factors, including atrial fibrillation independent of other types of arrhythmias (P < .001), a factor not significant for mechanical valves, as well as diabetes (P < .001), cerebrovascular disease (P < .001), dialysis (P < .001), and endocarditis (P < .001).

“This is probably intuitive, but patients who were on a factor Xa inhibitor before their valve replacement were also more likely to be discharged on a factor Xa inhibitor,” Dr. Kalra said at the virtual meeting, sponsored by MedStar Heart & Vascular Institute.

The year-to-year increase in DOAC use among those undergoing bioprosthetic valve replacement over the study period, which was a significant trend, was not observed among those undergoing mechanical valve replacement. Rather, the 1% proportion remained stable over the study period.

“We wanted to look at outcomes, but we found that the STS database, which only includes data out to 30 days, is not structured for this type of analysis,” Dr. Kalra said. He was also concerned about the limitations of a comparison in which 1% of the sample was being compared to 99%.
 

Expert: One percent is ‘very small number’

David J. Cohen, MD, commented on the 1% figure, which was so low that a moderator questioned whether it could be due mostly to coding errors.

“This is a very, very small number so at some level it is reassuring that it is so low in the mechanical valves,” Dr. Cohen said. However, he was more circumspect about the larger number in bioprosthetic valves.

“I have always thought it was a bit strange there was a warning against using them in bioprosthetic valves, especially in the aortic position,” he said.

Direct oral anticoagulants (DOACs) are used in about 1% of patients undergoing surgical mechanical aortic and mitral valve replacement, but in up to 6% of surgical bioprosthetic valve replacements, according to registry data presented at CRT 2021.

In an analysis of the Society of Thoracic Surgery (STS) registry during 2014-2017, DOAC use increased steadily among those undergoing surgical bioprosthetic valve replacement, reaching a number that is potentially clinically significant, according to Ankur Kalra, MD, an interventional cardiologist at Akron General Hospital who has an academic appointment at the Cleveland Clinic.

There was no increase in the use of DOACs observed among patients undergoing mechanical valve replacement, “but even if the number is 1%, they should probably not be used at all until we accrue more data,” Dr. Kalra said.
 

DOACs discouraged in patients with mechanical or bioprosthetic valves

In Food and Drug Administration labeling, DOACs are contraindicated or not recommended. This can be traced to the randomized RE-ALIGN trial, which was stopped prematurely due to evidence of harm from a DOAC, according to Dr. Kalra.

In RE-ALIGN, which enrolled patients undergoing mechanical aortic or mitral valve replacement, dabigatran was associated not only with more bleeding events than warfarin, but also more thromboembolic events.

There are no randomized data comparing the factor Xa inhibitors rivaroxaban or apixaban to warfarin in heart valve surgery, but Dr. Kalra noted cautionary language is found in the labeling of both, “perhaps due to the RE-ALIGN data.”
 

Registry shows trends in prescribing

In the STS registry data, 193 (1.1%) of the 18,142 patients undergoing mechanical aortic valve surgery, 139 (1.0%) of the 13,942 patients undergoing mechanical mitral valve surgery, 5,625 (4.7%) of the 116,203 patients undergoing aortic bioprosthetic aortic valve surgery, and 2,180 (5.9%) of the 39,243 patients undergoing bioprosthetic mitral valve surgery were on a DOAC at discharge.

Among those receiving a mechanical value and placed on a DOAC, about two-thirds were on a factor Xa inhibitor rather than dabigatran. For those receiving a bioprosthetic value, the proportion was greater than 80%. Dr. Kalra speculated that the RE-ALIGN trial might be the reason factor Xa inhibitors were favored.

In both types of valves, whether mechanical or bioprosthetic, more comorbidities predicted a greater likelihood of receiving a DOAC rather than warfarin. For those receiving mechanical values, the comorbidities with a significant association with greater DOAC use included hypertension (P = .003), dyslipidemia (P = .02), arrhythmia (P < .001), and peripheral arterial disease (P < 0.001).

The same factors were significant for predicting increased likelihood of a DOAC following bioprosthetic valve replacement, but there were additional factors, including atrial fibrillation independent of other types of arrhythmias (P < .001), a factor not significant for mechanical valves, as well as diabetes (P < .001), cerebrovascular disease (P < .001), dialysis (P < .001), and endocarditis (P < .001).

“This is probably intuitive, but patients who were on a factor Xa inhibitor before their valve replacement were also more likely to be discharged on a factor Xa inhibitor,” Dr. Kalra said at the virtual meeting, sponsored by MedStar Heart & Vascular Institute.

The year-to-year increase in DOAC use among those undergoing bioprosthetic valve replacement over the study period, which was a significant trend, was not observed among those undergoing mechanical valve replacement. Rather, the 1% proportion remained stable over the study period.

“We wanted to look at outcomes, but we found that the STS database, which only includes data out to 30 days, is not structured for this type of analysis,” Dr. Kalra said. He was also concerned about the limitations of a comparison in which 1% of the sample was being compared to 99%.
 

Expert: One percent is ‘very small number’

David J. Cohen, MD, commented on the 1% figure, which was so low that a moderator questioned whether it could be due mostly to coding errors.

“This is a very, very small number so at some level it is reassuring that it is so low in the mechanical valves,” Dr. Cohen said. However, he was more circumspect about the larger number in bioprosthetic valves.

“I have always thought it was a bit strange there was a warning against using them in bioprosthetic valves, especially in the aortic position,” he said.

Direct oral anticoagulants (DOACs) are used in about 1% of patients undergoing surgical mechanical aortic and mitral valve replacement, but in up to 6% of surgical bioprosthetic valve replacements, according to registry data presented at CRT 2021.

In an analysis of the Society of Thoracic Surgery (STS) registry during 2014-2017, DOAC use increased steadily among those undergoing surgical bioprosthetic valve replacement, reaching a number that is potentially clinically significant, according to Ankur Kalra, MD, an interventional cardiologist at Akron General Hospital who has an academic appointment at the Cleveland Clinic.

There was no increase in the use of DOACs observed among patients undergoing mechanical valve replacement, “but even if the number is 1%, they should probably not be used at all until we accrue more data,” Dr. Kalra said.
 

DOACs discouraged in patients with mechanical or bioprosthetic valves

In Food and Drug Administration labeling, DOACs are contraindicated or not recommended. This can be traced to the randomized RE-ALIGN trial, which was stopped prematurely due to evidence of harm from a DOAC, according to Dr. Kalra.

In RE-ALIGN, which enrolled patients undergoing mechanical aortic or mitral valve replacement, dabigatran was associated not only with more bleeding events than warfarin, but also more thromboembolic events.

There are no randomized data comparing the factor Xa inhibitors rivaroxaban or apixaban to warfarin in heart valve surgery, but Dr. Kalra noted cautionary language is found in the labeling of both, “perhaps due to the RE-ALIGN data.”
 

Registry shows trends in prescribing

In the STS registry data, 193 (1.1%) of the 18,142 patients undergoing mechanical aortic valve surgery, 139 (1.0%) of the 13,942 patients undergoing mechanical mitral valve surgery, 5,625 (4.7%) of the 116,203 patients undergoing aortic bioprosthetic aortic valve surgery, and 2,180 (5.9%) of the 39,243 patients undergoing bioprosthetic mitral valve surgery were on a DOAC at discharge.

Among those receiving a mechanical value and placed on a DOAC, about two-thirds were on a factor Xa inhibitor rather than dabigatran. For those receiving a bioprosthetic value, the proportion was greater than 80%. Dr. Kalra speculated that the RE-ALIGN trial might be the reason factor Xa inhibitors were favored.

In both types of valves, whether mechanical or bioprosthetic, more comorbidities predicted a greater likelihood of receiving a DOAC rather than warfarin. For those receiving mechanical values, the comorbidities with a significant association with greater DOAC use included hypertension (P = .003), dyslipidemia (P = .02), arrhythmia (P < .001), and peripheral arterial disease (P < 0.001).

The same factors were significant for predicting increased likelihood of a DOAC following bioprosthetic valve replacement, but there were additional factors, including atrial fibrillation independent of other types of arrhythmias (P < .001), a factor not significant for mechanical valves, as well as diabetes (P < .001), cerebrovascular disease (P < .001), dialysis (P < .001), and endocarditis (P < .001).

“This is probably intuitive, but patients who were on a factor Xa inhibitor before their valve replacement were also more likely to be discharged on a factor Xa inhibitor,” Dr. Kalra said at the virtual meeting, sponsored by MedStar Heart & Vascular Institute.

The year-to-year increase in DOAC use among those undergoing bioprosthetic valve replacement over the study period, which was a significant trend, was not observed among those undergoing mechanical valve replacement. Rather, the 1% proportion remained stable over the study period.

“We wanted to look at outcomes, but we found that the STS database, which only includes data out to 30 days, is not structured for this type of analysis,” Dr. Kalra said. He was also concerned about the limitations of a comparison in which 1% of the sample was being compared to 99%.
 

Expert: One percent is ‘very small number’

David J. Cohen, MD, commented on the 1% figure, which was so low that a moderator questioned whether it could be due mostly to coding errors.

“This is a very, very small number so at some level it is reassuring that it is so low in the mechanical valves,” Dr. Cohen said. However, he was more circumspect about the larger number in bioprosthetic valves.

“I have always thought it was a bit strange there was a warning against using them in bioprosthetic valves, especially in the aortic position,” he said.

In patients with acute ischemic stroke, the use of thrombolysis in the late window of 4.5-9 hours after symptom onset was not associated with an increase in clot migration that would cause reduced clot accessibility to endovascular therapy, a new analysis from the EXTEND trial shows.

“There was no significant difference in the incidence of clot migration leading to clot inaccessibility in patients who received placebo or (intravenous) thrombolysis,” the authors report.

“Our results found no convincing evidence against the use of bridging thrombolysis before endovascular therapy in patients with acute ischemic stroke who present outside the 4.5-hour window,” they conclude.

“This information is important because it provides some comfort for neurointerventionists that IV thrombolysis does not unduly increase the risk of clot migration,” senior author, Bernard Yan, DMedSci, FRACP, told this news organization.

The study was published online in Stroke on Feb. 16.

The Australian researchers explain that endovascular thrombectomy is the standard of care in patients presenting with acute ischemic stroke caused by large-vessel occlusion, and current treatment guidelines recommend bridging thrombolysis for all patients receiving thrombectomy within the 4.5-hour time window.

While thrombectomy is also recommended in selected patients up to 24 hours after onset of symptoms, it remains unclear whether thrombolysis pretreatment should be administered in this setting.

One of the issues that might affect use of thrombolysis is distal clot migration. As proximal clot location is a crucial factor determining suitability for endovascular clot retrieval, distal migration may prevent successful thrombectomy, they note.   

“Clot migration can happen any time and makes life more difficult for the neurointerventionist who performs the endovascular clot retrieval,” added Dr. Yan, who is a neurologist and neurointerventionist at the Royal Melbourne Hospital, Australia.

In the current paper, the researchers report a retrospective analysis of data from the EXTEND trial of late thrombolysis, defined as 4.5-9 hours after symptom onset, to investigate the association between thrombolysis and clot migration leading to clot irretrievability.

The analysis included a total of 220 patients (109 patients in the placebo group and 111 in the thrombolysis group).

Results showed that retrievable clot was seen on baseline imaging in 69% of patients in the placebo group and 61% in the thrombolysis group. Clot resolution occurred in 28% of patients in the placebo group and 50% in the thrombolysis group. 

No significant difference was observed in the incidence of clot migration leading to inaccessibility between groups. Clot migration from a retrievable to nonretrievable location occurred in 19% of the placebo group and 14% of the thrombolysis group, with an odds ratio for clot migration in the thrombolysis group of 0.70 (95% confidence interval, 0.35-1.44). This outcome was consistent across subgroups.

The researchers note that, to their knowledge, this is the first randomized controlled study to assess the effect of thrombolysis on clot migration and accessibility in an extended time window.

They acknowledge that a limitation of this study is that they only assessed clot migration from a retrievable to a nonretrievable location; therefore, the true frequency of any clot migration occurring was likely to be higher, and this could explain why other reports have found higher odds ratios of clot migration.

But they point out that they chose to limit their analysis in this way specifically to guide decision-making regarding bridging thrombolysis incorporating endovascular therapy in the extended time window.

“The findings of this study are highly relevant in the current clinical environment, where there are multiple ongoing trials looking at removing thrombolysis pretreatment within the 4.5-hour time window in thrombectomy patients,” the authors write.  

“We have demonstrated that thrombolysis in the 4.5- to 9-hour window is not associated with reduced clot accessibility, and this information will be useful in future trial designs incorporating this extended time window,” they add.

Commenting on the study for this news organization, Michael Hill, MD, University of Calgary (Alta.), said: “Thrombus migration does happen and is likely part of the natural history of ischemic stroke, which may be influenced by therapeutics such as thrombolysis. This paper’s top-line result is that thrombus migration occurs in both treated and untreated groups – and therefore that this is really an observation of natural history.”

Dr. Hill says that, at present, patients should be treated with thrombolysis before endovascular therapy if they are eligible, and these results do not change that recommendation. 

“The results of the ongoing trials comparing direct thrombectomy with thrombolysis plus thrombectomy will help to understand the potential clinical outcome relevance of this phenomenon,” he added.

The EXTEND trial was supported by grants from the Australian National Health and Medical Research Council of Australia and the Commonwealth Scientific and Industrial Research Organization Flagship Program. Dr. Yan reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

In patients with acute ischemic stroke, the use of thrombolysis in the late window of 4.5-9 hours after symptom onset was not associated with an increase in clot migration that would cause reduced clot accessibility to endovascular therapy, a new analysis from the EXTEND trial shows.

“There was no significant difference in the incidence of clot migration leading to clot inaccessibility in patients who received placebo or (intravenous) thrombolysis,” the authors report.

“Our results found no convincing evidence against the use of bridging thrombolysis before endovascular therapy in patients with acute ischemic stroke who present outside the 4.5-hour window,” they conclude.

“This information is important because it provides some comfort for neurointerventionists that IV thrombolysis does not unduly increase the risk of clot migration,” senior author, Bernard Yan, DMedSci, FRACP, told this news organization.

The study was published online in Stroke on Feb. 16.

The Australian researchers explain that endovascular thrombectomy is the standard of care in patients presenting with acute ischemic stroke caused by large-vessel occlusion, and current treatment guidelines recommend bridging thrombolysis for all patients receiving thrombectomy within the 4.5-hour time window.

While thrombectomy is also recommended in selected patients up to 24 hours after onset of symptoms, it remains unclear whether thrombolysis pretreatment should be administered in this setting.

One of the issues that might affect use of thrombolysis is distal clot migration. As proximal clot location is a crucial factor determining suitability for endovascular clot retrieval, distal migration may prevent successful thrombectomy, they note.   

“Clot migration can happen any time and makes life more difficult for the neurointerventionist who performs the endovascular clot retrieval,” added Dr. Yan, who is a neurologist and neurointerventionist at the Royal Melbourne Hospital, Australia.

In the current paper, the researchers report a retrospective analysis of data from the EXTEND trial of late thrombolysis, defined as 4.5-9 hours after symptom onset, to investigate the association between thrombolysis and clot migration leading to clot irretrievability.

The analysis included a total of 220 patients (109 patients in the placebo group and 111 in the thrombolysis group).

Results showed that retrievable clot was seen on baseline imaging in 69% of patients in the placebo group and 61% in the thrombolysis group. Clot resolution occurred in 28% of patients in the placebo group and 50% in the thrombolysis group. 

No significant difference was observed in the incidence of clot migration leading to inaccessibility between groups. Clot migration from a retrievable to nonretrievable location occurred in 19% of the placebo group and 14% of the thrombolysis group, with an odds ratio for clot migration in the thrombolysis group of 0.70 (95% confidence interval, 0.35-1.44). This outcome was consistent across subgroups.

The researchers note that, to their knowledge, this is the first randomized controlled study to assess the effect of thrombolysis on clot migration and accessibility in an extended time window.

They acknowledge that a limitation of this study is that they only assessed clot migration from a retrievable to a nonretrievable location; therefore, the true frequency of any clot migration occurring was likely to be higher, and this could explain why other reports have found higher odds ratios of clot migration.

But they point out that they chose to limit their analysis in this way specifically to guide decision-making regarding bridging thrombolysis incorporating endovascular therapy in the extended time window.

“The findings of this study are highly relevant in the current clinical environment, where there are multiple ongoing trials looking at removing thrombolysis pretreatment within the 4.5-hour time window in thrombectomy patients,” the authors write.  

“We have demonstrated that thrombolysis in the 4.5- to 9-hour window is not associated with reduced clot accessibility, and this information will be useful in future trial designs incorporating this extended time window,” they add.

Commenting on the study for this news organization, Michael Hill, MD, University of Calgary (Alta.), said: “Thrombus migration does happen and is likely part of the natural history of ischemic stroke, which may be influenced by therapeutics such as thrombolysis. This paper’s top-line result is that thrombus migration occurs in both treated and untreated groups – and therefore that this is really an observation of natural history.”

Dr. Hill says that, at present, patients should be treated with thrombolysis before endovascular therapy if they are eligible, and these results do not change that recommendation. 

“The results of the ongoing trials comparing direct thrombectomy with thrombolysis plus thrombectomy will help to understand the potential clinical outcome relevance of this phenomenon,” he added.

The EXTEND trial was supported by grants from the Australian National Health and Medical Research Council of Australia and the Commonwealth Scientific and Industrial Research Organization Flagship Program. Dr. Yan reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

In patients with acute ischemic stroke, the use of thrombolysis in the late window of 4.5-9 hours after symptom onset was not associated with an increase in clot migration that would cause reduced clot accessibility to endovascular therapy, a new analysis from the EXTEND trial shows.

“There was no significant difference in the incidence of clot migration leading to clot inaccessibility in patients who received placebo or (intravenous) thrombolysis,” the authors report.

“Our results found no convincing evidence against the use of bridging thrombolysis before endovascular therapy in patients with acute ischemic stroke who present outside the 4.5-hour window,” they conclude.

“This information is important because it provides some comfort for neurointerventionists that IV thrombolysis does not unduly increase the risk of clot migration,” senior author, Bernard Yan, DMedSci, FRACP, told this news organization.

The study was published online in Stroke on Feb. 16.

The Australian researchers explain that endovascular thrombectomy is the standard of care in patients presenting with acute ischemic stroke caused by large-vessel occlusion, and current treatment guidelines recommend bridging thrombolysis for all patients receiving thrombectomy within the 4.5-hour time window.

While thrombectomy is also recommended in selected patients up to 24 hours after onset of symptoms, it remains unclear whether thrombolysis pretreatment should be administered in this setting.

One of the issues that might affect use of thrombolysis is distal clot migration. As proximal clot location is a crucial factor determining suitability for endovascular clot retrieval, distal migration may prevent successful thrombectomy, they note.   

“Clot migration can happen any time and makes life more difficult for the neurointerventionist who performs the endovascular clot retrieval,” added Dr. Yan, who is a neurologist and neurointerventionist at the Royal Melbourne Hospital, Australia.

In the current paper, the researchers report a retrospective analysis of data from the EXTEND trial of late thrombolysis, defined as 4.5-9 hours after symptom onset, to investigate the association between thrombolysis and clot migration leading to clot irretrievability.

The analysis included a total of 220 patients (109 patients in the placebo group and 111 in the thrombolysis group).

Results showed that retrievable clot was seen on baseline imaging in 69% of patients in the placebo group and 61% in the thrombolysis group. Clot resolution occurred in 28% of patients in the placebo group and 50% in the thrombolysis group. 

No significant difference was observed in the incidence of clot migration leading to inaccessibility between groups. Clot migration from a retrievable to nonretrievable location occurred in 19% of the placebo group and 14% of the thrombolysis group, with an odds ratio for clot migration in the thrombolysis group of 0.70 (95% confidence interval, 0.35-1.44). This outcome was consistent across subgroups.

The researchers note that, to their knowledge, this is the first randomized controlled study to assess the effect of thrombolysis on clot migration and accessibility in an extended time window.

They acknowledge that a limitation of this study is that they only assessed clot migration from a retrievable to a nonretrievable location; therefore, the true frequency of any clot migration occurring was likely to be higher, and this could explain why other reports have found higher odds ratios of clot migration.

But they point out that they chose to limit their analysis in this way specifically to guide decision-making regarding bridging thrombolysis incorporating endovascular therapy in the extended time window.

“The findings of this study are highly relevant in the current clinical environment, where there are multiple ongoing trials looking at removing thrombolysis pretreatment within the 4.5-hour time window in thrombectomy patients,” the authors write.  

“We have demonstrated that thrombolysis in the 4.5- to 9-hour window is not associated with reduced clot accessibility, and this information will be useful in future trial designs incorporating this extended time window,” they add.

Commenting on the study for this news organization, Michael Hill, MD, University of Calgary (Alta.), said: “Thrombus migration does happen and is likely part of the natural history of ischemic stroke, which may be influenced by therapeutics such as thrombolysis. This paper’s top-line result is that thrombus migration occurs in both treated and untreated groups – and therefore that this is really an observation of natural history.”

Dr. Hill says that, at present, patients should be treated with thrombolysis before endovascular therapy if they are eligible, and these results do not change that recommendation. 

“The results of the ongoing trials comparing direct thrombectomy with thrombolysis plus thrombectomy will help to understand the potential clinical outcome relevance of this phenomenon,” he added.

The EXTEND trial was supported by grants from the Australian National Health and Medical Research Council of Australia and the Commonwealth Scientific and Industrial Research Organization Flagship Program. Dr. Yan reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

New guidelines from the American Society of Hematology “strongly recommend” using no thromboprophylaxis over using parenteral thromboprophylaxis in ambulatory patients receiving cancer chemotherapy who have low venous thromboembolism (VTE) risk, and using no thromboprophylaxis over oral thromboprophylaxis with vitamin K antagonists in those at any VTE risk level.

The evidence-based guidelines for the prevention and treatment of VTE in patient with cancer, published online in Blood Advances, also include a “conditional recommendation” for using either thromboprophylaxis with the direct oral anticoagulants (DOACs) apixaban or rivaroxaban or using no thromboprophylaxis in ambulatory patients with intermediate risk and using the DOACs over no thromboprophylaxis in those with high VTE risk.

The purpose of the guidelines, which also address VTE prophylaxis in hospitalized patients with cancer and the use of anticoagulation for VTE treatment in patients with cancer, is to provide clinical decision support for shared decision-making by patients and clinicians, Gary H. Lyman, MD, of Fred Hutchinson Cancer Research Center, Seattle and Marc Carrier, MD, of the University of Ottawa, and their colleagues from the multidisciplinary guidelines panel explained.

“The recommendations take into consideration the strength of the evidence, risks of mortality, VTE, and bleeding, as well as quality of life, acceptability, and cost considerations,” they wrote, noting that VTE is a common complication in patients with cancer, who are at markedly increased risk for morbidity and mortality from VTE.
 

Levels of evidence

The panel members relied on updated and original systematic evidence reviews. Conditional recommendations, as opposed to strong recommendations, are defined by the panel as “suggestions,” and all 33 recommendations that make up the guidelines include a statement on the strength of the relevant evidence.

For example, the thromboprophylaxis recommendations for low, intermediate, and high VTE risk are made based on “moderate certainty in the evidence of effects,” and the recommendation for no thromboprophylaxis over oral thromboprophylaxis with vitamin K antagonists is a strong recommendation based on “very low certainty in the evidence of benefits, but high certainty about the harms.”

The guidelines panel also strongly recommends, based on moderate certainty in the evidence of effects, using low-molecular-weight heparin over unfractionated heparin for the initial treatment of VTE in patients with cancer, and suggests, based on “very low certainty in the evidence of effects,” using LMWH over fondaparinux in this setting.

In addition to primary prophylaxis in ambulatory and hospitalized patients and initial VTE treatment, they also address primary prophylaxis for patients with cancer who have a central venous catheter, VTE treatment in surgical patients with cancer, short-term VTE treatment, and long-term VTE treatment.

For example, the guidelines panel conditionally recommends:

• Not using parenteral or oral thromboprophylaxis in patients with cancer and a central venous catheter
• Using LMWH or fondaparinux for surgical patients with cancer
• Using DOACS for the short-term treatment of VTE, and LMWH or DOACs for the long-term treatment of VTE in patients with cancer.

The perils of VTE

VTE in patients with cancer can interfere with treatment, increase mortality risk, and increase costs, the authors noted, adding that VTE can also adversely affect cancer patients’ quality of life.

“Some have even reported the experience of VTE to be more upsetting than that of the cancer,” they wrote. “More than 50% of thrombotic events occur within 3 months of the cancer diagnosis, a time when most cancer treatments will be underway. Patients, who are still coming to terms with a recent cancer diagnosis, often view the occurrence of VTE as a further threat to life, confirmation of the severity of their condition, and a poor prognostic sign.”

Therefore, the new guidelines aim to reduce VTE frequency, risk of bleeding complications, morbidity, and costs, thereby improving quality of life and the patient experience, the authors said, noting that three other recent guidelines on VTEs in patients with cancer have been published: the 2019 American Society of Clinical Oncology guidelines, the 2019 International Initiative on Thrombosis and Cancer guidelines, and the 2020 National Comprehensive Cancer Network guidelines.

The ASH guidelines are similar in many ways to the other guidelines, but differ in some ways, as well. An example is the timing of initiation of pharmacological thromboprophylaxis in patients undergoing cancer-related major abdominal surgery. The ASCO and ITAC guidelines advise starting thromboprophylaxis preoperatively, whereas the ASH guidelines recommend initiating thromboprophylaxis postoperatively, citing “the limited advantages to initiating thromboprophylaxis preoperatively, in addition to the potential bleeding and logistical considerations associated with neuraxial anesthesia.”

These differences highlight a lack of data in that setting and the need for additional studies, the authors said.
 

ASH vs. ASCO

James Douketis, MD, a practicing clinician and professor of medicine at McMaster University, Hamilton, Ont., highlighted another difference between the ASH and ASCO guidelines.

“For the treatment of [cancer-associated thrombosis], ASCO gives a strong recommendation to use LMWH or DOACs (with some caveats), which is easy to follow. ASH, on the other hand, suggests LMWH or a DOAC for the first 7-10 days, DOACs for the first 3-6 months, and back to LMWH or DOACs after 6 months,” he said in an interview.

The recommendation is “very evidence based but ambiguous and not helpful for the practicing clinician,” added Dr. Douketis, who helped develop the ITAC guidelines, but was not part of the ASH or ASCO guideline panels.

ASCO also provides a clear recommendation for giving VTE prophylaxis for 4 weeks after cancer surgery in patients with high VTE risk, whereas ASH gives “a somewhat vague recommendation” for thromboprophylaxis after hospital discharge.

The guidelines are “pretty well aligned” with respect to recommendations on VTE prophylaxis in medical cancer patients receiving chemotherapy, and although the “extremely academic” ASH guidelines were developed by “a superb team using the same evidence and excellent methodology,” they are interpreted in slightly different ways and fall short when it comes to being clinician friendly, Dr. Douketis said.

“At the end of day, for practicing clinicians, the ASH guidelines don’t provide a message that’s easy to digest,” he added.

ASH has, however, provided a resource page that includes tools and information for implementing the guidelines in clinical practice, and will maintain the guidelines “through surveillance for new evidence, ongoing review by experts, and regular revisions,” the authors said.

[email protected]

New guidelines from the American Society of Hematology “strongly recommend” using no thromboprophylaxis over using parenteral thromboprophylaxis in ambulatory patients receiving cancer chemotherapy who have low venous thromboembolism (VTE) risk, and using no thromboprophylaxis over oral thromboprophylaxis with vitamin K antagonists in those at any VTE risk level.

The evidence-based guidelines for the prevention and treatment of VTE in patient with cancer, published online in Blood Advances, also include a “conditional recommendation” for using either thromboprophylaxis with the direct oral anticoagulants (DOACs) apixaban or rivaroxaban or using no thromboprophylaxis in ambulatory patients with intermediate risk and using the DOACs over no thromboprophylaxis in those with high VTE risk.

The purpose of the guidelines, which also address VTE prophylaxis in hospitalized patients with cancer and the use of anticoagulation for VTE treatment in patients with cancer, is to provide clinical decision support for shared decision-making by patients and clinicians, Gary H. Lyman, MD, of Fred Hutchinson Cancer Research Center, Seattle and Marc Carrier, MD, of the University of Ottawa, and their colleagues from the multidisciplinary guidelines panel explained.

“The recommendations take into consideration the strength of the evidence, risks of mortality, VTE, and bleeding, as well as quality of life, acceptability, and cost considerations,” they wrote, noting that VTE is a common complication in patients with cancer, who are at markedly increased risk for morbidity and mortality from VTE.
 

Levels of evidence

The panel members relied on updated and original systematic evidence reviews. Conditional recommendations, as opposed to strong recommendations, are defined by the panel as “suggestions,” and all 33 recommendations that make up the guidelines include a statement on the strength of the relevant evidence.

For example, the thromboprophylaxis recommendations for low, intermediate, and high VTE risk are made based on “moderate certainty in the evidence of effects,” and the recommendation for no thromboprophylaxis over oral thromboprophylaxis with vitamin K antagonists is a strong recommendation based on “very low certainty in the evidence of benefits, but high certainty about the harms.”

The guidelines panel also strongly recommends, based on moderate certainty in the evidence of effects, using low-molecular-weight heparin over unfractionated heparin for the initial treatment of VTE in patients with cancer, and suggests, based on “very low certainty in the evidence of effects,” using LMWH over fondaparinux in this setting.

In addition to primary prophylaxis in ambulatory and hospitalized patients and initial VTE treatment, they also address primary prophylaxis for patients with cancer who have a central venous catheter, VTE treatment in surgical patients with cancer, short-term VTE treatment, and long-term VTE treatment.

For example, the guidelines panel conditionally recommends:

• Not using parenteral or oral thromboprophylaxis in patients with cancer and a central venous catheter
• Using LMWH or fondaparinux for surgical patients with cancer
• Using DOACS for the short-term treatment of VTE, and LMWH or DOACs for the long-term treatment of VTE in patients with cancer.

The perils of VTE

VTE in patients with cancer can interfere with treatment, increase mortality risk, and increase costs, the authors noted, adding that VTE can also adversely affect cancer patients’ quality of life.

“Some have even reported the experience of VTE to be more upsetting than that of the cancer,” they wrote. “More than 50% of thrombotic events occur within 3 months of the cancer diagnosis, a time when most cancer treatments will be underway. Patients, who are still coming to terms with a recent cancer diagnosis, often view the occurrence of VTE as a further threat to life, confirmation of the severity of their condition, and a poor prognostic sign.”

Therefore, the new guidelines aim to reduce VTE frequency, risk of bleeding complications, morbidity, and costs, thereby improving quality of life and the patient experience, the authors said, noting that three other recent guidelines on VTEs in patients with cancer have been published: the 2019 American Society of Clinical Oncology guidelines, the 2019 International Initiative on Thrombosis and Cancer guidelines, and the 2020 National Comprehensive Cancer Network guidelines.

The ASH guidelines are similar in many ways to the other guidelines, but differ in some ways, as well. An example is the timing of initiation of pharmacological thromboprophylaxis in patients undergoing cancer-related major abdominal surgery. The ASCO and ITAC guidelines advise starting thromboprophylaxis preoperatively, whereas the ASH guidelines recommend initiating thromboprophylaxis postoperatively, citing “the limited advantages to initiating thromboprophylaxis preoperatively, in addition to the potential bleeding and logistical considerations associated with neuraxial anesthesia.”

These differences highlight a lack of data in that setting and the need for additional studies, the authors said.
 

ASH vs. ASCO

James Douketis, MD, a practicing clinician and professor of medicine at McMaster University, Hamilton, Ont., highlighted another difference between the ASH and ASCO guidelines.

“For the treatment of [cancer-associated thrombosis], ASCO gives a strong recommendation to use LMWH or DOACs (with some caveats), which is easy to follow. ASH, on the other hand, suggests LMWH or a DOAC for the first 7-10 days, DOACs for the first 3-6 months, and back to LMWH or DOACs after 6 months,” he said in an interview.

The recommendation is “very evidence based but ambiguous and not helpful for the practicing clinician,” added Dr. Douketis, who helped develop the ITAC guidelines, but was not part of the ASH or ASCO guideline panels.

ASCO also provides a clear recommendation for giving VTE prophylaxis for 4 weeks after cancer surgery in patients with high VTE risk, whereas ASH gives “a somewhat vague recommendation” for thromboprophylaxis after hospital discharge.

The guidelines are “pretty well aligned” with respect to recommendations on VTE prophylaxis in medical cancer patients receiving chemotherapy, and although the “extremely academic” ASH guidelines were developed by “a superb team using the same evidence and excellent methodology,” they are interpreted in slightly different ways and fall short when it comes to being clinician friendly, Dr. Douketis said.

“At the end of day, for practicing clinicians, the ASH guidelines don’t provide a message that’s easy to digest,” he added.

ASH has, however, provided a resource page that includes tools and information for implementing the guidelines in clinical practice, and will maintain the guidelines “through surveillance for new evidence, ongoing review by experts, and regular revisions,” the authors said.

[email protected]

New guidelines from the American Society of Hematology “strongly recommend” using no thromboprophylaxis over using parenteral thromboprophylaxis in ambulatory patients receiving cancer chemotherapy who have low venous thromboembolism (VTE) risk, and using no thromboprophylaxis over oral thromboprophylaxis with vitamin K antagonists in those at any VTE risk level.

The evidence-based guidelines for the prevention and treatment of VTE in patient with cancer, published online in Blood Advances, also include a “conditional recommendation” for using either thromboprophylaxis with the direct oral anticoagulants (DOACs) apixaban or rivaroxaban or using no thromboprophylaxis in ambulatory patients with intermediate risk and using the DOACs over no thromboprophylaxis in those with high VTE risk.

The purpose of the guidelines, which also address VTE prophylaxis in hospitalized patients with cancer and the use of anticoagulation for VTE treatment in patients with cancer, is to provide clinical decision support for shared decision-making by patients and clinicians, Gary H. Lyman, MD, of Fred Hutchinson Cancer Research Center, Seattle and Marc Carrier, MD, of the University of Ottawa, and their colleagues from the multidisciplinary guidelines panel explained.

“The recommendations take into consideration the strength of the evidence, risks of mortality, VTE, and bleeding, as well as quality of life, acceptability, and cost considerations,” they wrote, noting that VTE is a common complication in patients with cancer, who are at markedly increased risk for morbidity and mortality from VTE.
 

Levels of evidence

The panel members relied on updated and original systematic evidence reviews. Conditional recommendations, as opposed to strong recommendations, are defined by the panel as “suggestions,” and all 33 recommendations that make up the guidelines include a statement on the strength of the relevant evidence.

For example, the thromboprophylaxis recommendations for low, intermediate, and high VTE risk are made based on “moderate certainty in the evidence of effects,” and the recommendation for no thromboprophylaxis over oral thromboprophylaxis with vitamin K antagonists is a strong recommendation based on “very low certainty in the evidence of benefits, but high certainty about the harms.”

The guidelines panel also strongly recommends, based on moderate certainty in the evidence of effects, using low-molecular-weight heparin over unfractionated heparin for the initial treatment of VTE in patients with cancer, and suggests, based on “very low certainty in the evidence of effects,” using LMWH over fondaparinux in this setting.

In addition to primary prophylaxis in ambulatory and hospitalized patients and initial VTE treatment, they also address primary prophylaxis for patients with cancer who have a central venous catheter, VTE treatment in surgical patients with cancer, short-term VTE treatment, and long-term VTE treatment.

For example, the guidelines panel conditionally recommends:

• Not using parenteral or oral thromboprophylaxis in patients with cancer and a central venous catheter
• Using LMWH or fondaparinux for surgical patients with cancer
• Using DOACS for the short-term treatment of VTE, and LMWH or DOACs for the long-term treatment of VTE in patients with cancer.

The perils of VTE

VTE in patients with cancer can interfere with treatment, increase mortality risk, and increase costs, the authors noted, adding that VTE can also adversely affect cancer patients’ quality of life.

“Some have even reported the experience of VTE to be more upsetting than that of the cancer,” they wrote. “More than 50% of thrombotic events occur within 3 months of the cancer diagnosis, a time when most cancer treatments will be underway. Patients, who are still coming to terms with a recent cancer diagnosis, often view the occurrence of VTE as a further threat to life, confirmation of the severity of their condition, and a poor prognostic sign.”

Therefore, the new guidelines aim to reduce VTE frequency, risk of bleeding complications, morbidity, and costs, thereby improving quality of life and the patient experience, the authors said, noting that three other recent guidelines on VTEs in patients with cancer have been published: the 2019 American Society of Clinical Oncology guidelines, the 2019 International Initiative on Thrombosis and Cancer guidelines, and the 2020 National Comprehensive Cancer Network guidelines.

The ASH guidelines are similar in many ways to the other guidelines, but differ in some ways, as well. An example is the timing of initiation of pharmacological thromboprophylaxis in patients undergoing cancer-related major abdominal surgery. The ASCO and ITAC guidelines advise starting thromboprophylaxis preoperatively, whereas the ASH guidelines recommend initiating thromboprophylaxis postoperatively, citing “the limited advantages to initiating thromboprophylaxis preoperatively, in addition to the potential bleeding and logistical considerations associated with neuraxial anesthesia.”

These differences highlight a lack of data in that setting and the need for additional studies, the authors said.
 

ASH vs. ASCO

James Douketis, MD, a practicing clinician and professor of medicine at McMaster University, Hamilton, Ont., highlighted another difference between the ASH and ASCO guidelines.

“For the treatment of [cancer-associated thrombosis], ASCO gives a strong recommendation to use LMWH or DOACs (with some caveats), which is easy to follow. ASH, on the other hand, suggests LMWH or a DOAC for the first 7-10 days, DOACs for the first 3-6 months, and back to LMWH or DOACs after 6 months,” he said in an interview.

The recommendation is “very evidence based but ambiguous and not helpful for the practicing clinician,” added Dr. Douketis, who helped develop the ITAC guidelines, but was not part of the ASH or ASCO guideline panels.

ASCO also provides a clear recommendation for giving VTE prophylaxis for 4 weeks after cancer surgery in patients with high VTE risk, whereas ASH gives “a somewhat vague recommendation” for thromboprophylaxis after hospital discharge.

The guidelines are “pretty well aligned” with respect to recommendations on VTE prophylaxis in medical cancer patients receiving chemotherapy, and although the “extremely academic” ASH guidelines were developed by “a superb team using the same evidence and excellent methodology,” they are interpreted in slightly different ways and fall short when it comes to being clinician friendly, Dr. Douketis said.

“At the end of day, for practicing clinicians, the ASH guidelines don’t provide a message that’s easy to digest,” he added.

ASH has, however, provided a resource page that includes tools and information for implementing the guidelines in clinical practice, and will maintain the guidelines “through surveillance for new evidence, ongoing review by experts, and regular revisions,” the authors said.

[email protected]

Over 10% of transgender men (females transitioning to male) who take testosterone develop high hematocrit levels that could put them at greater risk for a thrombotic event, and the largest increase in levels occurs in the first year after starting therapy, a new Dutch study indicates.

Erythrocytosis, defined as a hematocrit greater than 0.50 L/L, is a potentially serious side effect of testosterone therapy, say Milou Cecilia Madsen, MD, and colleagues in their article published online Feb. 18, 2021, in the Journal of Clinical Endocrinology & Metabolism.

When hematocrit was measured twice, 11.1% of the cohort of 1073 trans men had levels in excess of 0.50 L/L over a 20-year follow-up.

“Erythrocytosis is common in transgender men treated with testosterone, especially in those who smoke, have [a] high BMI [body mass index], and [who] use testosterone injections,” Dr. Madsen, of the VU University Medical Center Amsterdam, said in a statement from the Endocrine Society.

“A reasonable first step in the care of transgender men with high red blood cells while on testosterone is to advise them to quit smoking, switch injectable testosterone to gel, and, if BMI is high, to lose weight,” she added.
 

First large study of testosterone in trans men with 20-year follow-up

Transgender men often undergo testosterone therapy as part of gender-affirming treatment. 

Secondary erythrocytosis, a condition where the body makes too many red blood cells, is a common side effect of testosterone therapy that can increase the risk of thrombolic events, heart attack, and stroke, Dr. Madsen and colleagues explained.

This is the first study of a large cohort of trans men taking testosterone therapy followed for up to 20 years. Because of the large sample size, statistical analysis with many determinants could be performed. And because of the long follow-up, a clear time relation between initiation of testosterone therapy and hematocrit could be studied, they noted.

Participants were part of the Amsterdam Cohort of Gender Dysphoria study, a large cohort of individuals seen at the Center of Expertise on Gender Dysphoria at Amsterdam University Medical Center between 1972 and 2015.

Laboratory measurements taken between 2004 and 2018 were available for analysis. Trans men visited the center every 3-6 months during their first year of testosterone therapy and were then monitored every year or every other year.

Long-acting undecanoate injection was associated with the highest risk of a hematocrit level greater than 0.50 L/L, and the risk of erythrocytosis in those who took long-acting intramuscular injections was about threefold higher, compared with testosterone gel (adjusted odds ratio, 3.1).

In contrast, short-acting ester injections and oral administration of testosterone had a similar risk for erythrocytosis, as did testosterone gel.

Other determinants of elevated hematocrit included smoking, medical history of a number of comorbid conditions, and older age on initiation of testosterone.

In contrast, “higher testosterone levels per se were not associated with an increased odds of hematocrit greater than 0.50 L/L”, the authors noted.
 

Current advice for trans men based on old guidance for hypogonadism

The authors said that current advice for trans men is based on recommendations for testosterone-treated hypogonadal cis men (those assigned male at birth) from 2008, which advises a hematocrit greater than 0.50 L/L has a moderate to high risk of adverse outcome. For levels greater than 0.54 L/L, cessation of testosterone therapy, a dose reduction, or therapeutic phlebotomy to reduce the risk of adverse events is advised. For levels 0.50-0.54 L/L, no clear advice is given.

But questions remain as to whether these guidelines are applicable to trans men because the duration of testosterone therapy is much longer in trans men and hormone treatment often cannot be discontinued without causing distress.

Meanwhile, hematology guidelines indicate an upper limit for hematocrit for cis females of 0.48 L/L.

“It could be argued that the upper limit for cis females should be applied, as trans men are born with female genetics,” the authors said. “This is a subject for further research.”
 

Duration of testosterone therapy impacts risk of erythrocytosis

In the study, the researchers found that longer duration of testosterone therapy increased the risk of developing hematocrit levels greater than 0.50 L/L. For example, after 1 year, the cumulative incidence of erythrocytosis was 8%; after 10 years, it was 38%; and after 14 years, it was 50%.

Until more specific guidance is developed for trans men, if hematocrit levels rise to 0.50-0.54 L/L, the researchers suggested taking “reasonable” steps to prevent a further increase:

• Consider switching patients who use injectable testosterone to transdermal products.
• Advise patients with a BMI greater than 25 kg/m2 to lose weight to attain a BMI of 18.5-25.
• Advise patients to stop smoking.
• Pursue treatment optimization for chronic lung disease or sleep apnea.

The study had no external funding. The authors reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Over 10% of transgender men (females transitioning to male) who take testosterone develop high hematocrit levels that could put them at greater risk for a thrombotic event, and the largest increase in levels occurs in the first year after starting therapy, a new Dutch study indicates.

Erythrocytosis, defined as a hematocrit greater than 0.50 L/L, is a potentially serious side effect of testosterone therapy, say Milou Cecilia Madsen, MD, and colleagues in their article published online Feb. 18, 2021, in the Journal of Clinical Endocrinology & Metabolism.

When hematocrit was measured twice, 11.1% of the cohort of 1073 trans men had levels in excess of 0.50 L/L over a 20-year follow-up.

“Erythrocytosis is common in transgender men treated with testosterone, especially in those who smoke, have [a] high BMI [body mass index], and [who] use testosterone injections,” Dr. Madsen, of the VU University Medical Center Amsterdam, said in a statement from the Endocrine Society.

“A reasonable first step in the care of transgender men with high red blood cells while on testosterone is to advise them to quit smoking, switch injectable testosterone to gel, and, if BMI is high, to lose weight,” she added.
 

First large study of testosterone in trans men with 20-year follow-up

Transgender men often undergo testosterone therapy as part of gender-affirming treatment. 

Secondary erythrocytosis, a condition where the body makes too many red blood cells, is a common side effect of testosterone therapy that can increase the risk of thrombolic events, heart attack, and stroke, Dr. Madsen and colleagues explained.

This is the first study of a large cohort of trans men taking testosterone therapy followed for up to 20 years. Because of the large sample size, statistical analysis with many determinants could be performed. And because of the long follow-up, a clear time relation between initiation of testosterone therapy and hematocrit could be studied, they noted.

Participants were part of the Amsterdam Cohort of Gender Dysphoria study, a large cohort of individuals seen at the Center of Expertise on Gender Dysphoria at Amsterdam University Medical Center between 1972 and 2015.

Laboratory measurements taken between 2004 and 2018 were available for analysis. Trans men visited the center every 3-6 months during their first year of testosterone therapy and were then monitored every year or every other year.

Long-acting undecanoate injection was associated with the highest risk of a hematocrit level greater than 0.50 L/L, and the risk of erythrocytosis in those who took long-acting intramuscular injections was about threefold higher, compared with testosterone gel (adjusted odds ratio, 3.1).

In contrast, short-acting ester injections and oral administration of testosterone had a similar risk for erythrocytosis, as did testosterone gel.

Other determinants of elevated hematocrit included smoking, medical history of a number of comorbid conditions, and older age on initiation of testosterone.

In contrast, “higher testosterone levels per se were not associated with an increased odds of hematocrit greater than 0.50 L/L”, the authors noted.
 

Current advice for trans men based on old guidance for hypogonadism

The authors said that current advice for trans men is based on recommendations for testosterone-treated hypogonadal cis men (those assigned male at birth) from 2008, which advises a hematocrit greater than 0.50 L/L has a moderate to high risk of adverse outcome. For levels greater than 0.54 L/L, cessation of testosterone therapy, a dose reduction, or therapeutic phlebotomy to reduce the risk of adverse events is advised. For levels 0.50-0.54 L/L, no clear advice is given.

But questions remain as to whether these guidelines are applicable to trans men because the duration of testosterone therapy is much longer in trans men and hormone treatment often cannot be discontinued without causing distress.

Meanwhile, hematology guidelines indicate an upper limit for hematocrit for cis females of 0.48 L/L.

“It could be argued that the upper limit for cis females should be applied, as trans men are born with female genetics,” the authors said. “This is a subject for further research.”
 

Duration of testosterone therapy impacts risk of erythrocytosis

In the study, the researchers found that longer duration of testosterone therapy increased the risk of developing hematocrit levels greater than 0.50 L/L. For example, after 1 year, the cumulative incidence of erythrocytosis was 8%; after 10 years, it was 38%; and after 14 years, it was 50%.

Until more specific guidance is developed for trans men, if hematocrit levels rise to 0.50-0.54 L/L, the researchers suggested taking “reasonable” steps to prevent a further increase:

• Consider switching patients who use injectable testosterone to transdermal products.
• Advise patients with a BMI greater than 25 kg/m2 to lose weight to attain a BMI of 18.5-25.
• Advise patients to stop smoking.
• Pursue treatment optimization for chronic lung disease or sleep apnea.

The study had no external funding. The authors reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Over 10% of transgender men (females transitioning to male) who take testosterone develop high hematocrit levels that could put them at greater risk for a thrombotic event, and the largest increase in levels occurs in the first year after starting therapy, a new Dutch study indicates.

Erythrocytosis, defined as a hematocrit greater than 0.50 L/L, is a potentially serious side effect of testosterone therapy, say Milou Cecilia Madsen, MD, and colleagues in their article published online Feb. 18, 2021, in the Journal of Clinical Endocrinology & Metabolism.

When hematocrit was measured twice, 11.1% of the cohort of 1073 trans men had levels in excess of 0.50 L/L over a 20-year follow-up.

“Erythrocytosis is common in transgender men treated with testosterone, especially in those who smoke, have [a] high BMI [body mass index], and [who] use testosterone injections,” Dr. Madsen, of the VU University Medical Center Amsterdam, said in a statement from the Endocrine Society.

“A reasonable first step in the care of transgender men with high red blood cells while on testosterone is to advise them to quit smoking, switch injectable testosterone to gel, and, if BMI is high, to lose weight,” she added.
 

First large study of testosterone in trans men with 20-year follow-up

Transgender men often undergo testosterone therapy as part of gender-affirming treatment. 

Secondary erythrocytosis, a condition where the body makes too many red blood cells, is a common side effect of testosterone therapy that can increase the risk of thrombolic events, heart attack, and stroke, Dr. Madsen and colleagues explained.

This is the first study of a large cohort of trans men taking testosterone therapy followed for up to 20 years. Because of the large sample size, statistical analysis with many determinants could be performed. And because of the long follow-up, a clear time relation between initiation of testosterone therapy and hematocrit could be studied, they noted.

Participants were part of the Amsterdam Cohort of Gender Dysphoria study, a large cohort of individuals seen at the Center of Expertise on Gender Dysphoria at Amsterdam University Medical Center between 1972 and 2015.

Laboratory measurements taken between 2004 and 2018 were available for analysis. Trans men visited the center every 3-6 months during their first year of testosterone therapy and were then monitored every year or every other year.

Long-acting undecanoate injection was associated with the highest risk of a hematocrit level greater than 0.50 L/L, and the risk of erythrocytosis in those who took long-acting intramuscular injections was about threefold higher, compared with testosterone gel (adjusted odds ratio, 3.1).

In contrast, short-acting ester injections and oral administration of testosterone had a similar risk for erythrocytosis, as did testosterone gel.

Other determinants of elevated hematocrit included smoking, medical history of a number of comorbid conditions, and older age on initiation of testosterone.

In contrast, “higher testosterone levels per se were not associated with an increased odds of hematocrit greater than 0.50 L/L”, the authors noted.
 

Current advice for trans men based on old guidance for hypogonadism

The authors said that current advice for trans men is based on recommendations for testosterone-treated hypogonadal cis men (those assigned male at birth) from 2008, which advises a hematocrit greater than 0.50 L/L has a moderate to high risk of adverse outcome. For levels greater than 0.54 L/L, cessation of testosterone therapy, a dose reduction, or therapeutic phlebotomy to reduce the risk of adverse events is advised. For levels 0.50-0.54 L/L, no clear advice is given.

But questions remain as to whether these guidelines are applicable to trans men because the duration of testosterone therapy is much longer in trans men and hormone treatment often cannot be discontinued without causing distress.

Meanwhile, hematology guidelines indicate an upper limit for hematocrit for cis females of 0.48 L/L.

“It could be argued that the upper limit for cis females should be applied, as trans men are born with female genetics,” the authors said. “This is a subject for further research.”
 

Duration of testosterone therapy impacts risk of erythrocytosis

In the study, the researchers found that longer duration of testosterone therapy increased the risk of developing hematocrit levels greater than 0.50 L/L. For example, after 1 year, the cumulative incidence of erythrocytosis was 8%; after 10 years, it was 38%; and after 14 years, it was 50%.

Until more specific guidance is developed for trans men, if hematocrit levels rise to 0.50-0.54 L/L, the researchers suggested taking “reasonable” steps to prevent a further increase:

• Consider switching patients who use injectable testosterone to transdermal products.
• Advise patients with a BMI greater than 25 kg/m2 to lose weight to attain a BMI of 18.5-25.
• Advise patients to stop smoking.
• Pursue treatment optimization for chronic lung disease or sleep apnea.

The study had no external funding. The authors reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

The Food and Drug Administration has alerted the public to an increased risk of serious heart-related problems and cancer risk associated with the Janus kinase inhibitor tofacitinib (Xeljanz, Xeljanz XR), based on early results from a safety clinical trial comparing tofacitinib and tumor necrosis factor inhibitors in patients with rheumatoid arthritis (RA).

The FDA is awaiting further results from the trial, but in a safety communication issued on Feb. 4, the agency advised patients not to discontinue tofacitinib without consulting their health care providers and advised health care professionals to weigh the risks and benefits when prescribing the drug and continue to follow the current prescribing information.

Tofacitinib was approved for treatment of RA in 2012 at a 5-mg dose. After this approval, the FDA required drug manufacturer Pfizer to conduct a safety clinical trial that included the 5-mg twice-daily dose and a 10-mg twice-daily dose that is currently approved only for ulcerative colitis. In addition to RA and ulcerative colitis, tofacitinib is approved for adults with active psoriatic arthritis and patients aged 2 years or older with active polyarticular course juvenile idiopathic arthritis.

Pfizer announced partial results of the study, known as the ORAL Surveillance trial, in a press release on Jan. 27. The randomized trial included 4,362 RA patients aged 50 years and older who received either 5-mg or 10-mg doses of tofacitinib or a TNF inhibitor (adalimumab or etanercept).

The full results have yet to be released, but based on data from approximately 10,000 person-years for the combined tofacitinib groups and approximately 5,000 person-years for the TNF inhibitor group, the rate of major cardiovascular adverse events was significantly higher in the combined tofacitinib group, compared with the TNF inhibitor group (0.98 vs. 0.73 per 100 person-years; hazard ratio, 1.33). In addition, the rate of adjudicated malignancies was significantly higher in the tofacitinib group, compared with the TNF inhibitor group (1.13 vs. 0.77 per 100 person-years; HR, 1.48).

In February 2019, the FDA issued a warning stating an increased risk of pulmonary embolism and death associated with the 10-mg twice-daily dose of tofacitinib, following interims results from the safety study.

In July 2019, the FDA added a boxed warning to tofacitinib advising of the increased risk for pulmonary embolism and death associated with the 10-mg twice-daily dose.

The FDA encouraged health care professionals and patients to report any side effects from tofacitinib or other medications through the FDA MedWatch program online or by phone at 1-800-332-1088.

Until nuances revealed, no change in practice

The preliminary study findings contain some nuances that are a bit complicated from a statistical standpoint, according to Daniel Furst, MD, professor emeritus of medicine at the University of California, Los Angeles; adjunct professor at the University of Washington, Seattle; and research professor at the University of Florence (Italy).

Updated on 2/8/2021.

The Food and Drug Administration has alerted the public to an increased risk of serious heart-related problems and cancer risk associated with the Janus kinase inhibitor tofacitinib (Xeljanz, Xeljanz XR), based on early results from a safety clinical trial comparing tofacitinib and tumor necrosis factor inhibitors in patients with rheumatoid arthritis (RA).

The FDA is awaiting further results from the trial, but in a safety communication issued on Feb. 4, the agency advised patients not to discontinue tofacitinib without consulting their health care providers and advised health care professionals to weigh the risks and benefits when prescribing the drug and continue to follow the current prescribing information.

Tofacitinib was approved for treatment of RA in 2012 at a 5-mg dose. After this approval, the FDA required drug manufacturer Pfizer to conduct a safety clinical trial that included the 5-mg twice-daily dose and a 10-mg twice-daily dose that is currently approved only for ulcerative colitis. In addition to RA and ulcerative colitis, tofacitinib is approved for adults with active psoriatic arthritis and patients aged 2 years or older with active polyarticular course juvenile idiopathic arthritis.

Pfizer announced partial results of the study, known as the ORAL Surveillance trial, in a press release on Jan. 27. The randomized trial included 4,362 RA patients aged 50 years and older who received either 5-mg or 10-mg doses of tofacitinib or a TNF inhibitor (adalimumab or etanercept).

The full results have yet to be released, but based on data from approximately 10,000 person-years for the combined tofacitinib groups and approximately 5,000 person-years for the TNF inhibitor group, the rate of major cardiovascular adverse events was significantly higher in the combined tofacitinib group, compared with the TNF inhibitor group (0.98 vs. 0.73 per 100 person-years; hazard ratio, 1.33). In addition, the rate of adjudicated malignancies was significantly higher in the tofacitinib group, compared with the TNF inhibitor group (1.13 vs. 0.77 per 100 person-years; HR, 1.48).

In February 2019, the FDA issued a warning stating an increased risk of pulmonary embolism and death associated with the 10-mg twice-daily dose of tofacitinib, following interims results from the safety study.

In July 2019, the FDA added a boxed warning to tofacitinib advising of the increased risk for pulmonary embolism and death associated with the 10-mg twice-daily dose.

The FDA encouraged health care professionals and patients to report any side effects from tofacitinib or other medications through the FDA MedWatch program online or by phone at 1-800-332-1088.

Until nuances revealed, no change in practice

The preliminary study findings contain some nuances that are a bit complicated from a statistical standpoint, according to Daniel Furst, MD, professor emeritus of medicine at the University of California, Los Angeles; adjunct professor at the University of Washington, Seattle; and research professor at the University of Florence (Italy).

Updated on 2/8/2021.

The Food and Drug Administration has alerted the public to an increased risk of serious heart-related problems and cancer risk associated with the Janus kinase inhibitor tofacitinib (Xeljanz, Xeljanz XR), based on early results from a safety clinical trial comparing tofacitinib and tumor necrosis factor inhibitors in patients with rheumatoid arthritis (RA).

The FDA is awaiting further results from the trial, but in a safety communication issued on Feb. 4, the agency advised patients not to discontinue tofacitinib without consulting their health care providers and advised health care professionals to weigh the risks and benefits when prescribing the drug and continue to follow the current prescribing information.

Tofacitinib was approved for treatment of RA in 2012 at a 5-mg dose. After this approval, the FDA required drug manufacturer Pfizer to conduct a safety clinical trial that included the 5-mg twice-daily dose and a 10-mg twice-daily dose that is currently approved only for ulcerative colitis. In addition to RA and ulcerative colitis, tofacitinib is approved for adults with active psoriatic arthritis and patients aged 2 years or older with active polyarticular course juvenile idiopathic arthritis.

Pfizer announced partial results of the study, known as the ORAL Surveillance trial, in a press release on Jan. 27. The randomized trial included 4,362 RA patients aged 50 years and older who received either 5-mg or 10-mg doses of tofacitinib or a TNF inhibitor (adalimumab or etanercept).

The full results have yet to be released, but based on data from approximately 10,000 person-years for the combined tofacitinib groups and approximately 5,000 person-years for the TNF inhibitor group, the rate of major cardiovascular adverse events was significantly higher in the combined tofacitinib group, compared with the TNF inhibitor group (0.98 vs. 0.73 per 100 person-years; hazard ratio, 1.33). In addition, the rate of adjudicated malignancies was significantly higher in the tofacitinib group, compared with the TNF inhibitor group (1.13 vs. 0.77 per 100 person-years; HR, 1.48).

In February 2019, the FDA issued a warning stating an increased risk of pulmonary embolism and death associated with the 10-mg twice-daily dose of tofacitinib, following interims results from the safety study.

In July 2019, the FDA added a boxed warning to tofacitinib advising of the increased risk for pulmonary embolism and death associated with the 10-mg twice-daily dose.

The FDA encouraged health care professionals and patients to report any side effects from tofacitinib or other medications through the FDA MedWatch program online or by phone at 1-800-332-1088.

Until nuances revealed, no change in practice

The preliminary study findings contain some nuances that are a bit complicated from a statistical standpoint, according to Daniel Furst, MD, professor emeritus of medicine at the University of California, Los Angeles; adjunct professor at the University of Washington, Seattle; and research professor at the University of Florence (Italy).

Updated on 2/8/2021.

Autopsies on patients who died from COVID-19 are providing important clues on how to treat the disease. In an analysis of 40 hearts from COVID-19 patients who died early in the pandemic, myocyte necrosis was seen in 14 hearts, or 35%.

In the majority of these hearts, pathologists found both small areas of focal necrosis and cardiac thrombi, most of which were microthrombi in myocardial capillaries, arterioles, and small muscular cells.

In an interview, senior author Aloke V. Finn, MD, CVPath Institute, Gaithersburg, Md., stressed the importance of understanding what they saw, but also what they didn’t see.

“What we saw in the majority of patients with myocardial injury were these small areas of infarct and microthrombi in small vessels. What we didn’t see was any evidence of myocarditis and or huge infarcts in, like, the LAD artery,” he said.

“What we’re seeing here is not clinically detectable. ... There is no test that will tell you there are microthrombi and no imaging tests that will show these focal areas of necrosis, but that doesn’t mean it’s not there,” he added.

The finding of myocyte necrosis in about one-third of samples is consistent with another study that showed that 30%-40% of patients hospitalized with COVID-19 have elevated troponins, noted Dr. Finn. The investigators were unable to obtain troponin levels on their patients, which could limit the clinical translation of myocardial necrosis detected at autopsy.

Dr. Finn and colleagues, including first author Dario Pellegrini, MD, from Ospedale Papa Giovanni XXIII in Bergamo, Italy, published their findings online in Circulation on Jan. 22, 2020.

The report is a follow-up to another just published by Dr. Finn’s group in the Journal of the American College of Cardiology, which showed that myocarditis is a very rare finding in COVID-19 autopsies.

Only three of 14 individuals (21.4%) with evidence of myocyte necrosis showed evidence of acute MI, which Dr. Finn and colleagues define as an area of necrosis at least 1 cm² in size. The remaining 11 (78.6%) had only discrete areas of myocyte necrosis (>20 necrotic myocytes with an area of ≥0.05 mm², but <1 cm²).

“This makes sense when we saw what type of thrombus there was in these cases; it wasn’t thrombus in major epicardial vessels but microthombi in small vessels,” said Dr. Finn.

In those with necrosis, cardiac thrombi were present in 11 of 14 (78.6%) cases, with 2 of 14 (14.2%) having epicardial coronary artery thrombi and 0 of 14 (64.3%) having microthrombi in myocardial capillaries, arterioles, and small muscular arteries.

Further supporting the role of COVID-19–related hypercoagulability as the cause of myocardial injury in many patients, the investigators noted that the incidence of severe coronary artery disease (defined as >75% cross sectional narrowing) did not differ significantly between those with and without necrosis.
 

COVID-19 vs. non–COVID-19 thrombi

Going one step further, Dr. Finn’s team compared cardiac microthrombi from their COVID-19–positive autopsy cases with intramyocardial thromboemboli from COVID-19 cases. They also compared the samples with aspirated thrombi obtained during primary percutaneous coronary intervention from uninfected and COVID-19–infected patients presenting with ST-segment elevation MI (STEMI).

The autopsy-obtained microthrombi had significantly more fibrin and terminal complement C5b-9 immunostaining than intramyocardial thromboemboli from COVID-19–negative subjects and than aspirated thrombi from either COVID-positive or COVID-negative STEMI patients.

“Basically, what we’re seeing in these thrombi is evidence of an immune-mediated reaction,” said Dr. Finn, explaining that complement C5b-9 is an innate immune system protein that circulates in the blood in response to any kind of activation of the immune system. “It is nonspecific but can also lead to coagulation problems,” he said.
 

Anticoagulation, yes, but dose unclear

These findings clearly support the use of anticoagulation in hospitalized COVID patients, said Jeffrey Weitz, MD, director of the Thrombosis & Atherosclerosis Research Institute, McMaster University, Hamilton, Ont. But the details of how much anticoagulation, what kind, and for whom are still a moving target.

“I think what we can say at this point is that these autopsy findings fit with previous studies that have shown microthrombi in the lungs and thrombi in the legs and gut, and support the notion that these patients should receive prophylactic doses of anticoagulants if they’re sick enough to be hospitalized,” said Dr. Weitz.

“But it’s not as simple as to say that this study shows clots form in the heart of COVID patients and therefore more anticoagulation is going to be better than less anticoagulation,” he said in an interview.

Recent top-line findings from three linked clinical trials – REMAP-CAP, ACTIV-4, and ATTACC – show that full-dose anticoagulation was beneficial in moderately ill patients hospitalized for COVID-19 and reduced the need for mechanical ventilation.

Moderately ill patients are those not in intensive care and who did not require organ support, such as mechanical ventilation, at the time of enrollment.

However, the same group reported findings in December that showed that routine use of full-dose anticoagulation when started in the ICU in critically ill patients was not beneficial and possibly harmful.

Dr. Weitz was only a little bit surprised by this finding of potential harm in the sickest patients. “I figured everybody should get prophylaxis but I wasn’t sure that everybody should get intensified anticoagulant. But my assumption was that if anybody is going to benefit from it, it would be the ICU patients.”

It was notable, said Dr. Weitz, that levels of D-dimer, a fibrin degradation product, were not associated with outcomes. “So, it doesn’t seem to be that patients with evidence of more clotting are more likely to benefit, which might indicate that it’s not the anticoagulant effect of the heparin that’s helping, but maybe the anti-inflammatory effect. At this point, we just don’t know.”

All three studies have paused enrollment of the critically ill subgroup, but are continuing to enroll patients with moderate illness and expect to publish results in the coming months, according to previous coverage from this news organization.

The study was funded by CVPath, a nonprofit institute that receives funding from a number of different industry entities. Dr. Finn and Dr. Weitz reported no relevant conflicts of interest.

A version of this article first appeared on Medscape.com.

Autopsies on patients who died from COVID-19 are providing important clues on how to treat the disease. In an analysis of 40 hearts from COVID-19 patients who died early in the pandemic, myocyte necrosis was seen in 14 hearts, or 35%.

In the majority of these hearts, pathologists found both small areas of focal necrosis and cardiac thrombi, most of which were microthrombi in myocardial capillaries, arterioles, and small muscular cells.

In an interview, senior author Aloke V. Finn, MD, CVPath Institute, Gaithersburg, Md., stressed the importance of understanding what they saw, but also what they didn’t see.

“What we saw in the majority of patients with myocardial injury were these small areas of infarct and microthrombi in small vessels. What we didn’t see was any evidence of myocarditis and or huge infarcts in, like, the LAD artery,” he said.

“What we’re seeing here is not clinically detectable. ... There is no test that will tell you there are microthrombi and no imaging tests that will show these focal areas of necrosis, but that doesn’t mean it’s not there,” he added.

The finding of myocyte necrosis in about one-third of samples is consistent with another study that showed that 30%-40% of patients hospitalized with COVID-19 have elevated troponins, noted Dr. Finn. The investigators were unable to obtain troponin levels on their patients, which could limit the clinical translation of myocardial necrosis detected at autopsy.

Dr. Finn and colleagues, including first author Dario Pellegrini, MD, from Ospedale Papa Giovanni XXIII in Bergamo, Italy, published their findings online in Circulation on Jan. 22, 2020.

The report is a follow-up to another just published by Dr. Finn’s group in the Journal of the American College of Cardiology, which showed that myocarditis is a very rare finding in COVID-19 autopsies.

Only three of 14 individuals (21.4%) with evidence of myocyte necrosis showed evidence of acute MI, which Dr. Finn and colleagues define as an area of necrosis at least 1 cm² in size. The remaining 11 (78.6%) had only discrete areas of myocyte necrosis (>20 necrotic myocytes with an area of ≥0.05 mm², but <1 cm²).

“This makes sense when we saw what type of thrombus there was in these cases; it wasn’t thrombus in major epicardial vessels but microthombi in small vessels,” said Dr. Finn.

In those with necrosis, cardiac thrombi were present in 11 of 14 (78.6%) cases, with 2 of 14 (14.2%) having epicardial coronary artery thrombi and 0 of 14 (64.3%) having microthrombi in myocardial capillaries, arterioles, and small muscular arteries.

Further supporting the role of COVID-19–related hypercoagulability as the cause of myocardial injury in many patients, the investigators noted that the incidence of severe coronary artery disease (defined as >75% cross sectional narrowing) did not differ significantly between those with and without necrosis.
 

COVID-19 vs. non–COVID-19 thrombi

Going one step further, Dr. Finn’s team compared cardiac microthrombi from their COVID-19–positive autopsy cases with intramyocardial thromboemboli from COVID-19 cases. They also compared the samples with aspirated thrombi obtained during primary percutaneous coronary intervention from uninfected and COVID-19–infected patients presenting with ST-segment elevation MI (STEMI).

The autopsy-obtained microthrombi had significantly more fibrin and terminal complement C5b-9 immunostaining than intramyocardial thromboemboli from COVID-19–negative subjects and than aspirated thrombi from either COVID-positive or COVID-negative STEMI patients.

“Basically, what we’re seeing in these thrombi is evidence of an immune-mediated reaction,” said Dr. Finn, explaining that complement C5b-9 is an innate immune system protein that circulates in the blood in response to any kind of activation of the immune system. “It is nonspecific but can also lead to coagulation problems,” he said.
 

Anticoagulation, yes, but dose unclear

These findings clearly support the use of anticoagulation in hospitalized COVID patients, said Jeffrey Weitz, MD, director of the Thrombosis & Atherosclerosis Research Institute, McMaster University, Hamilton, Ont. But the details of how much anticoagulation, what kind, and for whom are still a moving target.

“I think what we can say at this point is that these autopsy findings fit with previous studies that have shown microthrombi in the lungs and thrombi in the legs and gut, and support the notion that these patients should receive prophylactic doses of anticoagulants if they’re sick enough to be hospitalized,” said Dr. Weitz.

“But it’s not as simple as to say that this study shows clots form in the heart of COVID patients and therefore more anticoagulation is going to be better than less anticoagulation,” he said in an interview.

Recent top-line findings from three linked clinical trials – REMAP-CAP, ACTIV-4, and ATTACC – show that full-dose anticoagulation was beneficial in moderately ill patients hospitalized for COVID-19 and reduced the need for mechanical ventilation.

Moderately ill patients are those not in intensive care and who did not require organ support, such as mechanical ventilation, at the time of enrollment.

However, the same group reported findings in December that showed that routine use of full-dose anticoagulation when started in the ICU in critically ill patients was not beneficial and possibly harmful.

Dr. Weitz was only a little bit surprised by this finding of potential harm in the sickest patients. “I figured everybody should get prophylaxis but I wasn’t sure that everybody should get intensified anticoagulant. But my assumption was that if anybody is going to benefit from it, it would be the ICU patients.”

It was notable, said Dr. Weitz, that levels of D-dimer, a fibrin degradation product, were not associated with outcomes. “So, it doesn’t seem to be that patients with evidence of more clotting are more likely to benefit, which might indicate that it’s not the anticoagulant effect of the heparin that’s helping, but maybe the anti-inflammatory effect. At this point, we just don’t know.”

All three studies have paused enrollment of the critically ill subgroup, but are continuing to enroll patients with moderate illness and expect to publish results in the coming months, according to previous coverage from this news organization.

The study was funded by CVPath, a nonprofit institute that receives funding from a number of different industry entities. Dr. Finn and Dr. Weitz reported no relevant conflicts of interest.

A version of this article first appeared on Medscape.com.

Autopsies on patients who died from COVID-19 are providing important clues on how to treat the disease. In an analysis of 40 hearts from COVID-19 patients who died early in the pandemic, myocyte necrosis was seen in 14 hearts, or 35%.

In the majority of these hearts, pathologists found both small areas of focal necrosis and cardiac thrombi, most of which were microthrombi in myocardial capillaries, arterioles, and small muscular cells.

In an interview, senior author Aloke V. Finn, MD, CVPath Institute, Gaithersburg, Md., stressed the importance of understanding what they saw, but also what they didn’t see.

“What we saw in the majority of patients with myocardial injury were these small areas of infarct and microthrombi in small vessels. What we didn’t see was any evidence of myocarditis and or huge infarcts in, like, the LAD artery,” he said.

“What we’re seeing here is not clinically detectable. ... There is no test that will tell you there are microthrombi and no imaging tests that will show these focal areas of necrosis, but that doesn’t mean it’s not there,” he added.

The finding of myocyte necrosis in about one-third of samples is consistent with another study that showed that 30%-40% of patients hospitalized with COVID-19 have elevated troponins, noted Dr. Finn. The investigators were unable to obtain troponin levels on their patients, which could limit the clinical translation of myocardial necrosis detected at autopsy.

Dr. Finn and colleagues, including first author Dario Pellegrini, MD, from Ospedale Papa Giovanni XXIII in Bergamo, Italy, published their findings online in Circulation on Jan. 22, 2020.

The report is a follow-up to another just published by Dr. Finn’s group in the Journal of the American College of Cardiology, which showed that myocarditis is a very rare finding in COVID-19 autopsies.

Only three of 14 individuals (21.4%) with evidence of myocyte necrosis showed evidence of acute MI, which Dr. Finn and colleagues define as an area of necrosis at least 1 cm² in size. The remaining 11 (78.6%) had only discrete areas of myocyte necrosis (>20 necrotic myocytes with an area of ≥0.05 mm², but <1 cm²).

“This makes sense when we saw what type of thrombus there was in these cases; it wasn’t thrombus in major epicardial vessels but microthombi in small vessels,” said Dr. Finn.

In those with necrosis, cardiac thrombi were present in 11 of 14 (78.6%) cases, with 2 of 14 (14.2%) having epicardial coronary artery thrombi and 0 of 14 (64.3%) having microthrombi in myocardial capillaries, arterioles, and small muscular arteries.

Further supporting the role of COVID-19–related hypercoagulability as the cause of myocardial injury in many patients, the investigators noted that the incidence of severe coronary artery disease (defined as >75% cross sectional narrowing) did not differ significantly between those with and without necrosis.
 

COVID-19 vs. non–COVID-19 thrombi

Going one step further, Dr. Finn’s team compared cardiac microthrombi from their COVID-19–positive autopsy cases with intramyocardial thromboemboli from COVID-19 cases. They also compared the samples with aspirated thrombi obtained during primary percutaneous coronary intervention from uninfected and COVID-19–infected patients presenting with ST-segment elevation MI (STEMI).

The autopsy-obtained microthrombi had significantly more fibrin and terminal complement C5b-9 immunostaining than intramyocardial thromboemboli from COVID-19–negative subjects and than aspirated thrombi from either COVID-positive or COVID-negative STEMI patients.

“Basically, what we’re seeing in these thrombi is evidence of an immune-mediated reaction,” said Dr. Finn, explaining that complement C5b-9 is an innate immune system protein that circulates in the blood in response to any kind of activation of the immune system. “It is nonspecific but can also lead to coagulation problems,” he said.
 

Anticoagulation, yes, but dose unclear

These findings clearly support the use of anticoagulation in hospitalized COVID patients, said Jeffrey Weitz, MD, director of the Thrombosis & Atherosclerosis Research Institute, McMaster University, Hamilton, Ont. But the details of how much anticoagulation, what kind, and for whom are still a moving target.

“I think what we can say at this point is that these autopsy findings fit with previous studies that have shown microthrombi in the lungs and thrombi in the legs and gut, and support the notion that these patients should receive prophylactic doses of anticoagulants if they’re sick enough to be hospitalized,” said Dr. Weitz.

“But it’s not as simple as to say that this study shows clots form in the heart of COVID patients and therefore more anticoagulation is going to be better than less anticoagulation,” he said in an interview.

Recent top-line findings from three linked clinical trials – REMAP-CAP, ACTIV-4, and ATTACC – show that full-dose anticoagulation was beneficial in moderately ill patients hospitalized for COVID-19 and reduced the need for mechanical ventilation.

Moderately ill patients are those not in intensive care and who did not require organ support, such as mechanical ventilation, at the time of enrollment.

However, the same group reported findings in December that showed that routine use of full-dose anticoagulation when started in the ICU in critically ill patients was not beneficial and possibly harmful.

Dr. Weitz was only a little bit surprised by this finding of potential harm in the sickest patients. “I figured everybody should get prophylaxis but I wasn’t sure that everybody should get intensified anticoagulant. But my assumption was that if anybody is going to benefit from it, it would be the ICU patients.”

It was notable, said Dr. Weitz, that levels of D-dimer, a fibrin degradation product, were not associated with outcomes. “So, it doesn’t seem to be that patients with evidence of more clotting are more likely to benefit, which might indicate that it’s not the anticoagulant effect of the heparin that’s helping, but maybe the anti-inflammatory effect. At this point, we just don’t know.”

All three studies have paused enrollment of the critically ill subgroup, but are continuing to enroll patients with moderate illness and expect to publish results in the coming months, according to previous coverage from this news organization.

The study was funded by CVPath, a nonprofit institute that receives funding from a number of different industry entities. Dr. Finn and Dr. Weitz reported no relevant conflicts of interest.

A version of this article first appeared on Medscape.com.

Background: The PARTHENON clinical development program has conducted several clinical trials to assess the effectiveness of ticagrelor in multiple cardiovascular diseases. A prior study revealed the addition of ticagrelor to aspirin in patients with history of MI showed a small benefit in cardiovascular outcomes but with increased bleeding risk. While this effect was seen in both patients with and without diabetes, the absolute benefit for those with diabetes was considered large because of their higher baseline risk. Given this, investigators wanted to know if addition of ticagrelor to aspirin could also be beneficial in diabetics with known coronary disease but without history of MI or stroke.

Further studies into risk stratification based on prothrombotic versus bleeding risk could be beneficial in identifying specific groups that could benefit from DAPT. Conclusions from this study suggest the benefit of DAPT in diabetics does not outweigh its risk.

Bottom line: Addition of ticagrelor to aspirin in diabetic patients with stable coronary disease and no prior MI or stroke is not recommended.

Citation: Steg PG et al. Ticagrelor in patients with stable coronary disease and diabetes. N Eng J Med. 2019 Oct 3;381(14):1309-20.

Dr. Breitbach is assistant professor of medicine, hospital medicine, at the Rocky Mountain Veterans Affairs Regional Medical Center, Aurora, Colo.

Background: The PARTHENON clinical development program has conducted several clinical trials to assess the effectiveness of ticagrelor in multiple cardiovascular diseases. A prior study revealed the addition of ticagrelor to aspirin in patients with history of MI showed a small benefit in cardiovascular outcomes but with increased bleeding risk. While this effect was seen in both patients with and without diabetes, the absolute benefit for those with diabetes was considered large because of their higher baseline risk. Given this, investigators wanted to know if addition of ticagrelor to aspirin could also be beneficial in diabetics with known coronary disease but without history of MI or stroke.

Further studies into risk stratification based on prothrombotic versus bleeding risk could be beneficial in identifying specific groups that could benefit from DAPT. Conclusions from this study suggest the benefit of DAPT in diabetics does not outweigh its risk.

Bottom line: Addition of ticagrelor to aspirin in diabetic patients with stable coronary disease and no prior MI or stroke is not recommended.

Citation: Steg PG et al. Ticagrelor in patients with stable coronary disease and diabetes. N Eng J Med. 2019 Oct 3;381(14):1309-20.

Dr. Breitbach is assistant professor of medicine, hospital medicine, at the Rocky Mountain Veterans Affairs Regional Medical Center, Aurora, Colo.

Background: The PARTHENON clinical development program has conducted several clinical trials to assess the effectiveness of ticagrelor in multiple cardiovascular diseases. A prior study revealed the addition of ticagrelor to aspirin in patients with history of MI showed a small benefit in cardiovascular outcomes but with increased bleeding risk. While this effect was seen in both patients with and without diabetes, the absolute benefit for those with diabetes was considered large because of their higher baseline risk. Given this, investigators wanted to know if addition of ticagrelor to aspirin could also be beneficial in diabetics with known coronary disease but without history of MI or stroke.

Further studies into risk stratification based on prothrombotic versus bleeding risk could be beneficial in identifying specific groups that could benefit from DAPT. Conclusions from this study suggest the benefit of DAPT in diabetics does not outweigh its risk.

Bottom line: Addition of ticagrelor to aspirin in diabetic patients with stable coronary disease and no prior MI or stroke is not recommended.

Citation: Steg PG et al. Ticagrelor in patients with stable coronary disease and diabetes. N Eng J Med. 2019 Oct 3;381(14):1309-20.

Dr. Breitbach is assistant professor of medicine, hospital medicine, at the Rocky Mountain Veterans Affairs Regional Medical Center, Aurora, Colo.

Background: Resumption of AC or AP therapy for patients following a GIB represents a common clinical challenge. Interruption of these medications following a GIB is associated with increased risk of macrovascular events, thrombosis, morbidity, and death. Prior studies have found inconsistent risk of rebleeding and death with resumption of these therapies following GIB. Little evidence exists for long-term outcomes and optimal timing of AC and AP resumption.

Although resumption of AC or AP following a GIB increased bleeding risk, this may be outweighed by reductions in ischemic events and death if these agents are continued. For hospitalist clinicians, this remains a nuanced and patient-centered decision.

Interpretation is limited by variability in GIB location, agents used, and timing of resumption. Also, the study population included a limited number of elderly patients with multiple comorbidities and high overall death rate.

Bottom line: Resuming AC and AP medications following gastrointestinal bleeding doubled the rebleeding risk but lowered the risk of ischemic events and death, compared with the discontinuation of these medications.

Citation: Sostres C et al. Risk of rebleeding, vascular events and death after gastrointestinal bleeding in anticoagulant and/or antiplatelet users. Aliment Pharmcol Ther. 2019 Oct;50:919-29.

Dr. Berry is assistant professor of medicine, hospital medicine, at the Rocky Mountain Veterans Affairs Regional Medical Center, Aurora, Colo.

Background: Resumption of AC or AP therapy for patients following a GIB represents a common clinical challenge. Interruption of these medications following a GIB is associated with increased risk of macrovascular events, thrombosis, morbidity, and death. Prior studies have found inconsistent risk of rebleeding and death with resumption of these therapies following GIB. Little evidence exists for long-term outcomes and optimal timing of AC and AP resumption.

Although resumption of AC or AP following a GIB increased bleeding risk, this may be outweighed by reductions in ischemic events and death if these agents are continued. For hospitalist clinicians, this remains a nuanced and patient-centered decision.

Interpretation is limited by variability in GIB location, agents used, and timing of resumption. Also, the study population included a limited number of elderly patients with multiple comorbidities and high overall death rate.

Bottom line: Resuming AC and AP medications following gastrointestinal bleeding doubled the rebleeding risk but lowered the risk of ischemic events and death, compared with the discontinuation of these medications.

Citation: Sostres C et al. Risk of rebleeding, vascular events and death after gastrointestinal bleeding in anticoagulant and/or antiplatelet users. Aliment Pharmcol Ther. 2019 Oct;50:919-29.

Dr. Berry is assistant professor of medicine, hospital medicine, at the Rocky Mountain Veterans Affairs Regional Medical Center, Aurora, Colo.

Background: Resumption of AC or AP therapy for patients following a GIB represents a common clinical challenge. Interruption of these medications following a GIB is associated with increased risk of macrovascular events, thrombosis, morbidity, and death. Prior studies have found inconsistent risk of rebleeding and death with resumption of these therapies following GIB. Little evidence exists for long-term outcomes and optimal timing of AC and AP resumption.

Although resumption of AC or AP following a GIB increased bleeding risk, this may be outweighed by reductions in ischemic events and death if these agents are continued. For hospitalist clinicians, this remains a nuanced and patient-centered decision.

Interpretation is limited by variability in GIB location, agents used, and timing of resumption. Also, the study population included a limited number of elderly patients with multiple comorbidities and high overall death rate.

Bottom line: Resuming AC and AP medications following gastrointestinal bleeding doubled the rebleeding risk but lowered the risk of ischemic events and death, compared with the discontinuation of these medications.

Citation: Sostres C et al. Risk of rebleeding, vascular events and death after gastrointestinal bleeding in anticoagulant and/or antiplatelet users. Aliment Pharmcol Ther. 2019 Oct;50:919-29.

Dr. Berry is assistant professor of medicine, hospital medicine, at the Rocky Mountain Veterans Affairs Regional Medical Center, Aurora, Colo.

Full-dose anticoagulation was superior to low, prophylactic doses in reducing the need for vital organ support such as ventilation in moderately ill patients hospitalized for COVID-19, according to a report released Jan. 22 by the National Institutes of Health (NIH).

“This is a major advance for patients hospitalized with COVID. Full dose of anticoagulation in these non-ICU patients improved outcomes and there’s a trend toward a reduction in mortality,” Judith Hochman, MD, director of the Cardiovascular Clinical Research Center at NYU Langone Medical Center, New York, said in an interview.

“We have treatments that are improving outcomes but not as many that reduce mortality, so we’re hopeful when the full dataset comes in that will be confirmed,” she said.

The observation of increased rates of blood clots and inflammation among COVID-19 patients, which can lead to complications such as lung failure, heart attack, and stroke, has given rise to various anticoagulant treatment protocols and a need for randomized data on routinely administering increased doses of anticoagulation to hospitalized patients.

Today’s top-line findings come from three linked clinical trials – REMAP-CAP, ACTIV-4, and ATTACC – examining the safety and efficacy of full-dose anticoagulation to treat moderately ill or critically ill adults hospitalized with COVID-19 compared with a lower dose typically used to prevent blood clots in hospitalized patients.

In December 2020, all three trials paused enrollment of the critically ill subgroup after results showed that full-dose anticoagulation started in the intensive care unit (ICU) was not beneficial and may have been harmful in some patients.

Moderately ill patients with COVID-19, defined as those who did not require ICU care or organ support, made up 80% of participants at enrollment in the three trials, Dr. Hochman said.

Among more than 1,000 moderately ill patients reviewed as of the data cut with the data safety monitoring board, full doses of low molecular weight or unfractionated heparin were superior to low prophylactic doses for the primary endpoint of need for ventilation or other organ supportive interventions at 21 days after randomization.

This met the predefined threshold for 99% probability of superiority and recruitment was stopped, Dr. Hochman reported. “Obviously safety figured into this decision. The risk/benefit ratio was very clear.”

The results do not pertain to patients with a previous indication for anticoagulation, who were excluded from the trials.

Data from an additional 1,000 patients will be reviewed and the data published sometime in the next 2-3 months, she said.

With large numbers of COVID-19 patients requiring hospitalization, the outcomes could help reduce the overload on intensive care units around the world, the NIH noted.

The results also highlight the critical role of timing in the course of COVID-19.

“We believe that full anticoagulation is effective early in the disease course,” Dr. Hochman said. “Based on the results so far from these three platform trials, those that were very, very sick at the time of enrollment really didn’t benefit and we needed to have caught them at an earlier stage.

“It’s possible that the people in the ICU are just different and the minute they get sick they need the ICU; so we haven’t clearly demonstrated this time course and when to intervene, but that’s the implication of the findings.”

The question of even earlier treatment is being examined in the partner ACTIV-4B trial, which is enrolling patients with COVID-19 illness not requiring hospitalization and randomizing them to the direct oral anticoagulant apixaban or aspirin or placebo.

“It’s a very important trial and we really want to get the message out that patients should volunteer for it,” said Dr. Hochman, principal investigator of the ACTIV-4 trial.

In the United States, the ACTIV-4 trial is being led by a collaborative effort involving a number of universities, including the University of Pittsburgh and New York University.

The REMAP-CAP, ACTIV-4, and ATTACC study platforms span five continents in more than 300 hospitals and are supported by multiple international funding organizations including the National Institutes of Health, Canadian Institutes of Health Research, the National Institute for Health Research (United Kingdom), the National Health and Medical Research Council (Australia), and the PREPARE and RECOVER consortia (European Union).

A version of this article first appeared on Medscape.com.

Full-dose anticoagulation was superior to low, prophylactic doses in reducing the need for vital organ support such as ventilation in moderately ill patients hospitalized for COVID-19, according to a report released Jan. 22 by the National Institutes of Health (NIH).

“This is a major advance for patients hospitalized with COVID. Full dose of anticoagulation in these non-ICU patients improved outcomes and there’s a trend toward a reduction in mortality,” Judith Hochman, MD, director of the Cardiovascular Clinical Research Center at NYU Langone Medical Center, New York, said in an interview.

“We have treatments that are improving outcomes but not as many that reduce mortality, so we’re hopeful when the full dataset comes in that will be confirmed,” she said.

The observation of increased rates of blood clots and inflammation among COVID-19 patients, which can lead to complications such as lung failure, heart attack, and stroke, has given rise to various anticoagulant treatment protocols and a need for randomized data on routinely administering increased doses of anticoagulation to hospitalized patients.

Today’s top-line findings come from three linked clinical trials – REMAP-CAP, ACTIV-4, and ATTACC – examining the safety and efficacy of full-dose anticoagulation to treat moderately ill or critically ill adults hospitalized with COVID-19 compared with a lower dose typically used to prevent blood clots in hospitalized patients.

In December 2020, all three trials paused enrollment of the critically ill subgroup after results showed that full-dose anticoagulation started in the intensive care unit (ICU) was not beneficial and may have been harmful in some patients.

Moderately ill patients with COVID-19, defined as those who did not require ICU care or organ support, made up 80% of participants at enrollment in the three trials, Dr. Hochman said.

Among more than 1,000 moderately ill patients reviewed as of the data cut with the data safety monitoring board, full doses of low molecular weight or unfractionated heparin were superior to low prophylactic doses for the primary endpoint of need for ventilation or other organ supportive interventions at 21 days after randomization.

This met the predefined threshold for 99% probability of superiority and recruitment was stopped, Dr. Hochman reported. “Obviously safety figured into this decision. The risk/benefit ratio was very clear.”

The results do not pertain to patients with a previous indication for anticoagulation, who were excluded from the trials.

Data from an additional 1,000 patients will be reviewed and the data published sometime in the next 2-3 months, she said.

With large numbers of COVID-19 patients requiring hospitalization, the outcomes could help reduce the overload on intensive care units around the world, the NIH noted.

The results also highlight the critical role of timing in the course of COVID-19.

“We believe that full anticoagulation is effective early in the disease course,” Dr. Hochman said. “Based on the results so far from these three platform trials, those that were very, very sick at the time of enrollment really didn’t benefit and we needed to have caught them at an earlier stage.

“It’s possible that the people in the ICU are just different and the minute they get sick they need the ICU; so we haven’t clearly demonstrated this time course and when to intervene, but that’s the implication of the findings.”

The question of even earlier treatment is being examined in the partner ACTIV-4B trial, which is enrolling patients with COVID-19 illness not requiring hospitalization and randomizing them to the direct oral anticoagulant apixaban or aspirin or placebo.

“It’s a very important trial and we really want to get the message out that patients should volunteer for it,” said Dr. Hochman, principal investigator of the ACTIV-4 trial.

In the United States, the ACTIV-4 trial is being led by a collaborative effort involving a number of universities, including the University of Pittsburgh and New York University.

The REMAP-CAP, ACTIV-4, and ATTACC study platforms span five continents in more than 300 hospitals and are supported by multiple international funding organizations including the National Institutes of Health, Canadian Institutes of Health Research, the National Institute for Health Research (United Kingdom), the National Health and Medical Research Council (Australia), and the PREPARE and RECOVER consortia (European Union).

A version of this article first appeared on Medscape.com.

Full-dose anticoagulation was superior to low, prophylactic doses in reducing the need for vital organ support such as ventilation in moderately ill patients hospitalized for COVID-19, according to a report released Jan. 22 by the National Institutes of Health (NIH).

“This is a major advance for patients hospitalized with COVID. Full dose of anticoagulation in these non-ICU patients improved outcomes and there’s a trend toward a reduction in mortality,” Judith Hochman, MD, director of the Cardiovascular Clinical Research Center at NYU Langone Medical Center, New York, said in an interview.

“We have treatments that are improving outcomes but not as many that reduce mortality, so we’re hopeful when the full dataset comes in that will be confirmed,” she said.

The observation of increased rates of blood clots and inflammation among COVID-19 patients, which can lead to complications such as lung failure, heart attack, and stroke, has given rise to various anticoagulant treatment protocols and a need for randomized data on routinely administering increased doses of anticoagulation to hospitalized patients.

Today’s top-line findings come from three linked clinical trials – REMAP-CAP, ACTIV-4, and ATTACC – examining the safety and efficacy of full-dose anticoagulation to treat moderately ill or critically ill adults hospitalized with COVID-19 compared with a lower dose typically used to prevent blood clots in hospitalized patients.

In December 2020, all three trials paused enrollment of the critically ill subgroup after results showed that full-dose anticoagulation started in the intensive care unit (ICU) was not beneficial and may have been harmful in some patients.

Moderately ill patients with COVID-19, defined as those who did not require ICU care or organ support, made up 80% of participants at enrollment in the three trials, Dr. Hochman said.

Among more than 1,000 moderately ill patients reviewed as of the data cut with the data safety monitoring board, full doses of low molecular weight or unfractionated heparin were superior to low prophylactic doses for the primary endpoint of need for ventilation or other organ supportive interventions at 21 days after randomization.

This met the predefined threshold for 99% probability of superiority and recruitment was stopped, Dr. Hochman reported. “Obviously safety figured into this decision. The risk/benefit ratio was very clear.”

The results do not pertain to patients with a previous indication for anticoagulation, who were excluded from the trials.

Data from an additional 1,000 patients will be reviewed and the data published sometime in the next 2-3 months, she said.

With large numbers of COVID-19 patients requiring hospitalization, the outcomes could help reduce the overload on intensive care units around the world, the NIH noted.

The results also highlight the critical role of timing in the course of COVID-19.

“We believe that full anticoagulation is effective early in the disease course,” Dr. Hochman said. “Based on the results so far from these three platform trials, those that were very, very sick at the time of enrollment really didn’t benefit and we needed to have caught them at an earlier stage.

“It’s possible that the people in the ICU are just different and the minute they get sick they need the ICU; so we haven’t clearly demonstrated this time course and when to intervene, but that’s the implication of the findings.”

The question of even earlier treatment is being examined in the partner ACTIV-4B trial, which is enrolling patients with COVID-19 illness not requiring hospitalization and randomizing them to the direct oral anticoagulant apixaban or aspirin or placebo.

“It’s a very important trial and we really want to get the message out that patients should volunteer for it,” said Dr. Hochman, principal investigator of the ACTIV-4 trial.

In the United States, the ACTIV-4 trial is being led by a collaborative effort involving a number of universities, including the University of Pittsburgh and New York University.

The REMAP-CAP, ACTIV-4, and ATTACC study platforms span five continents in more than 300 hospitals and are supported by multiple international funding organizations including the National Institutes of Health, Canadian Institutes of Health Research, the National Institute for Health Research (United Kingdom), the National Health and Medical Research Council (Australia), and the PREPARE and RECOVER consortia (European Union).

A version of this article first appeared on Medscape.com.