Exocrine Pancreatic Insufficiency: Clinical Presentation and Diagnosis

What is your approach to differentiating EPI from other pancreatic conditions when making a diagnosis?

Dr. Kothari: Exocrine pancreatic insufficiency, or EPI, is a condition largely defined by malabsorption as the result of inadequate digestive enzymes. The resulting symptoms from maldigestion include bloating, malodorous gas, abdominal pain, changes in bowel habits, and weight change. EPI can be caused by intrinsic pancreatic disorders (such as chronic pancreatitis, acute pancreatitis, cystic fibrosis or pancreatic cancer) or from extra-pancreatic diseases (including the result of gastrointestinal surgery). Thus, EPI should be considered a consequence of an already existing gastrointestinal disorder.

Can you a speak a little bit more about the signs and symptoms or characteristics that are most common in patients with EPI?

Dr. Kothari: The symptoms of EPI can range from bloating and abdominal pain with mild to overt steatorrhea with greasy and oily stools that are difficult to flush with malodorous flatulence, weight loss, and symptoms of vitamin and micronutrient deficiency. The pathophysiology of these symptoms results from inadequate enzymes which are needed for digestion. Particularly, lipase is the major enzyme needed for fat digestion and thus when not present leads to fat maldigestion resulting in symptoms. Furthermore, undigested fats result in alterations in gut motility which can further exacerbate symptoms to include nausea, vomiting, early satiety and inadequate stool evacuation.

Patients who have fat malabsorption, particularly for pancreatic insufficiency, can also have malnutrition as a result of inadequate absorption of nutrients and micronutrients. Particularly, we think about fat-soluble vitamins-- vitamin A, vitamin E, vitamin D, and vitamin K and in the initial evaluation of patients with established EPI, one could consider evaluation of comorbid bone disease.

How crucial is having the correct interpretation of the clinical presentation to pinpointing the diagnosis?

Dr. Kothari: This is a great question because, with exocrine pancreatic insufficiency as there is growing publicity for the disorder and because symptoms can be rather non-specific when mild, it is important to be informed on how best to make this diagnosis. Thus, it is important to review the predisposing conditions that may lead to the diagnosis of EPI. These conditions include cystic fibrosis, chronic pancreatitis, acute pancreatitis, previous pancreatic surgery, history of pancreatic cancer (or suspicion for new pancreatic cancer), history of diabetes, celiac disease, history of luminal surgeries (including bariatric surgery), and inflammatory bowel disease. Further, since EPI can be a result of intrinsic pancreatic pathologies, it is critical to consider the risk factors for chronic pancreatitis which include alcohol and tobacco ingestion, prior episodes of recurrent acute pancreatitis, genetic conditions that may predispose patients to chronic pancreatitis, including cystic fibrosis, and hereditary conditions that also result in pancreatitis. As clinicians, it is our role to obtain an accurate history to best gauge the risk factors for EPI.

After reviewing risk factors, we then must review the clinical presentation to know if the symptoms could be from EPI which include bloating, gas, abdominal pain, weight changes, changes in bowel habits and consequences of vitamin deficiencies. Since the symptoms of mild EPI can be similar to other GI conditions such as SIBO, celiac disease, and functional bowel disorders, gauging whether a patient has risk factors for EPI will help the clinician understand how likely a diagnosis of EPI may be and if and what testing would be appropriate.

In my practice, I consider diagnostic testing in patients who may be at risk for EPI and have mild symptoms such malodorous gas, bloating and mild steatorrhea. For patient with clear evidence of steatorrhea (weight loss and vitamin deficiencies) and have strong risk factors for EPI (i.e. heavy alcohol and tobacco and/or a history of recurrent or severe acute pancreatitis), I might consider imaging and/or empiric therapies as to expedite care.

How difficult is it to diagnose EPI and what steps do you take to ensure that you prescribe patients with the proper therapy?

Dr. Kothari: The diagnosis of pancreatic insufficiency, in my mind, needs to start with assessing the pre-test probability of the patient having EPI, since testing could lead to a false positive.

The test of choice in most scenarios for diagnosing pancreatic insufficiency is a stool test known as the fecal elastase. It is a measurement of pancreatic elastase in the stool. The test itself is a concentration. For any condition that results in a dilute stool sample, that'll result in a falsely low value that can give a patient a false positive test. Now, this can be corrected  by the lab concentrating the stool sample before running the test, but that testing center needs to know how to do that.

The other assumption that we make with this stool test is that we assume that the elastase is a stable molecule that can traverse all the gut and be collected adequately. And for any reason, if that enzyme is degraded for any reason, it's also going to provide a low test, a low result, resulting in a false positive.

If they have risk factors for chronic pancreatitis or pancreatic disease and they're presenting with symptoms of EPI, then the usual test that I'll choose is dedicated pancreatic imaging such as an MRI or dedicated CT pancreatic imaging, or endoscopic ultrasound. If we clinch a diagnosis of chronic pancreatitis and they have symptoms of pancreatic insufficiency, I think that’s enough to presume a diagnosis of exocrine pancreatic insufficiency and start treatment.

On the other hand, in patients who do not have risk factors for pancreatic disease but there remains some clinical suspicion for exocrine pancreatic insufficiency, then it may be reasonable to check a fecal elastase to rule out pancreatic insufficiency. If the test results are low, then follow-up dedicated pancreas imaging would be the next step in delineating intrinsic pancreatic conditions form extra-pancreatic causes.  If pancreas imaging effectively rules out pancreatic disease then I consider checking for celiac disease, ruling out small intestinal bacterial overgrowth and considering assessment of luminal motility (either with a capsule or small bowel follow through). Although functional neuroendocrine tumors have been previously considered a cause of EPI, these tumors tend to present with secretory diarrhea which typically present differently (and often more dramatically) than other causes of EPI. Thus, I do not routinely check vasoactive hormone levels.

I think the American Gastroenterological Association has great patient education documents for our patients. Thus, I would encourage our colleagues to use the AGA for their resources for our patients on EPI.

What is your approach to differentiating EPI from other pancreatic conditions when making a diagnosis?

Dr. Kothari: Exocrine pancreatic insufficiency, or EPI, is a condition largely defined by malabsorption as the result of inadequate digestive enzymes. The resulting symptoms from maldigestion include bloating, malodorous gas, abdominal pain, changes in bowel habits, and weight change. EPI can be caused by intrinsic pancreatic disorders (such as chronic pancreatitis, acute pancreatitis, cystic fibrosis or pancreatic cancer) or from extra-pancreatic diseases (including the result of gastrointestinal surgery). Thus, EPI should be considered a consequence of an already existing gastrointestinal disorder.

Can you a speak a little bit more about the signs and symptoms or characteristics that are most common in patients with EPI?

Dr. Kothari: The symptoms of EPI can range from bloating and abdominal pain with mild to overt steatorrhea with greasy and oily stools that are difficult to flush with malodorous flatulence, weight loss, and symptoms of vitamin and micronutrient deficiency. The pathophysiology of these symptoms results from inadequate enzymes which are needed for digestion. Particularly, lipase is the major enzyme needed for fat digestion and thus when not present leads to fat maldigestion resulting in symptoms. Furthermore, undigested fats result in alterations in gut motility which can further exacerbate symptoms to include nausea, vomiting, early satiety and inadequate stool evacuation.

Patients who have fat malabsorption, particularly for pancreatic insufficiency, can also have malnutrition as a result of inadequate absorption of nutrients and micronutrients. Particularly, we think about fat-soluble vitamins-- vitamin A, vitamin E, vitamin D, and vitamin K and in the initial evaluation of patients with established EPI, one could consider evaluation of comorbid bone disease.

How crucial is having the correct interpretation of the clinical presentation to pinpointing the diagnosis?

Dr. Kothari: This is a great question because, with exocrine pancreatic insufficiency as there is growing publicity for the disorder and because symptoms can be rather non-specific when mild, it is important to be informed on how best to make this diagnosis. Thus, it is important to review the predisposing conditions that may lead to the diagnosis of EPI. These conditions include cystic fibrosis, chronic pancreatitis, acute pancreatitis, previous pancreatic surgery, history of pancreatic cancer (or suspicion for new pancreatic cancer), history of diabetes, celiac disease, history of luminal surgeries (including bariatric surgery), and inflammatory bowel disease. Further, since EPI can be a result of intrinsic pancreatic pathologies, it is critical to consider the risk factors for chronic pancreatitis which include alcohol and tobacco ingestion, prior episodes of recurrent acute pancreatitis, genetic conditions that may predispose patients to chronic pancreatitis, including cystic fibrosis, and hereditary conditions that also result in pancreatitis. As clinicians, it is our role to obtain an accurate history to best gauge the risk factors for EPI.

After reviewing risk factors, we then must review the clinical presentation to know if the symptoms could be from EPI which include bloating, gas, abdominal pain, weight changes, changes in bowel habits and consequences of vitamin deficiencies. Since the symptoms of mild EPI can be similar to other GI conditions such as SIBO, celiac disease, and functional bowel disorders, gauging whether a patient has risk factors for EPI will help the clinician understand how likely a diagnosis of EPI may be and if and what testing would be appropriate.

In my practice, I consider diagnostic testing in patients who may be at risk for EPI and have mild symptoms such malodorous gas, bloating and mild steatorrhea. For patient with clear evidence of steatorrhea (weight loss and vitamin deficiencies) and have strong risk factors for EPI (i.e. heavy alcohol and tobacco and/or a history of recurrent or severe acute pancreatitis), I might consider imaging and/or empiric therapies as to expedite care.

How difficult is it to diagnose EPI and what steps do you take to ensure that you prescribe patients with the proper therapy?

Dr. Kothari: The diagnosis of pancreatic insufficiency, in my mind, needs to start with assessing the pre-test probability of the patient having EPI, since testing could lead to a false positive.

The test of choice in most scenarios for diagnosing pancreatic insufficiency is a stool test known as the fecal elastase. It is a measurement of pancreatic elastase in the stool. The test itself is a concentration. For any condition that results in a dilute stool sample, that'll result in a falsely low value that can give a patient a false positive test. Now, this can be corrected  by the lab concentrating the stool sample before running the test, but that testing center needs to know how to do that.

The other assumption that we make with this stool test is that we assume that the elastase is a stable molecule that can traverse all the gut and be collected adequately. And for any reason, if that enzyme is degraded for any reason, it's also going to provide a low test, a low result, resulting in a false positive.

If they have risk factors for chronic pancreatitis or pancreatic disease and they're presenting with symptoms of EPI, then the usual test that I'll choose is dedicated pancreatic imaging such as an MRI or dedicated CT pancreatic imaging, or endoscopic ultrasound. If we clinch a diagnosis of chronic pancreatitis and they have symptoms of pancreatic insufficiency, I think that’s enough to presume a diagnosis of exocrine pancreatic insufficiency and start treatment.

On the other hand, in patients who do not have risk factors for pancreatic disease but there remains some clinical suspicion for exocrine pancreatic insufficiency, then it may be reasonable to check a fecal elastase to rule out pancreatic insufficiency. If the test results are low, then follow-up dedicated pancreas imaging would be the next step in delineating intrinsic pancreatic conditions form extra-pancreatic causes.  If pancreas imaging effectively rules out pancreatic disease then I consider checking for celiac disease, ruling out small intestinal bacterial overgrowth and considering assessment of luminal motility (either with a capsule or small bowel follow through). Although functional neuroendocrine tumors have been previously considered a cause of EPI, these tumors tend to present with secretory diarrhea which typically present differently (and often more dramatically) than other causes of EPI. Thus, I do not routinely check vasoactive hormone levels.

I think the American Gastroenterological Association has great patient education documents for our patients. Thus, I would encourage our colleagues to use the AGA for their resources for our patients on EPI.

What is your approach to differentiating EPI from other pancreatic conditions when making a diagnosis?

Dr. Kothari: Exocrine pancreatic insufficiency, or EPI, is a condition largely defined by malabsorption as the result of inadequate digestive enzymes. The resulting symptoms from maldigestion include bloating, malodorous gas, abdominal pain, changes in bowel habits, and weight change. EPI can be caused by intrinsic pancreatic disorders (such as chronic pancreatitis, acute pancreatitis, cystic fibrosis or pancreatic cancer) or from extra-pancreatic diseases (including the result of gastrointestinal surgery). Thus, EPI should be considered a consequence of an already existing gastrointestinal disorder.

Can you a speak a little bit more about the signs and symptoms or characteristics that are most common in patients with EPI?

Dr. Kothari: The symptoms of EPI can range from bloating and abdominal pain with mild to overt steatorrhea with greasy and oily stools that are difficult to flush with malodorous flatulence, weight loss, and symptoms of vitamin and micronutrient deficiency. The pathophysiology of these symptoms results from inadequate enzymes which are needed for digestion. Particularly, lipase is the major enzyme needed for fat digestion and thus when not present leads to fat maldigestion resulting in symptoms. Furthermore, undigested fats result in alterations in gut motility which can further exacerbate symptoms to include nausea, vomiting, early satiety and inadequate stool evacuation.

Patients who have fat malabsorption, particularly for pancreatic insufficiency, can also have malnutrition as a result of inadequate absorption of nutrients and micronutrients. Particularly, we think about fat-soluble vitamins-- vitamin A, vitamin E, vitamin D, and vitamin K and in the initial evaluation of patients with established EPI, one could consider evaluation of comorbid bone disease.

How crucial is having the correct interpretation of the clinical presentation to pinpointing the diagnosis?

Dr. Kothari: This is a great question because, with exocrine pancreatic insufficiency as there is growing publicity for the disorder and because symptoms can be rather non-specific when mild, it is important to be informed on how best to make this diagnosis. Thus, it is important to review the predisposing conditions that may lead to the diagnosis of EPI. These conditions include cystic fibrosis, chronic pancreatitis, acute pancreatitis, previous pancreatic surgery, history of pancreatic cancer (or suspicion for new pancreatic cancer), history of diabetes, celiac disease, history of luminal surgeries (including bariatric surgery), and inflammatory bowel disease. Further, since EPI can be a result of intrinsic pancreatic pathologies, it is critical to consider the risk factors for chronic pancreatitis which include alcohol and tobacco ingestion, prior episodes of recurrent acute pancreatitis, genetic conditions that may predispose patients to chronic pancreatitis, including cystic fibrosis, and hereditary conditions that also result in pancreatitis. As clinicians, it is our role to obtain an accurate history to best gauge the risk factors for EPI.

After reviewing risk factors, we then must review the clinical presentation to know if the symptoms could be from EPI which include bloating, gas, abdominal pain, weight changes, changes in bowel habits and consequences of vitamin deficiencies. Since the symptoms of mild EPI can be similar to other GI conditions such as SIBO, celiac disease, and functional bowel disorders, gauging whether a patient has risk factors for EPI will help the clinician understand how likely a diagnosis of EPI may be and if and what testing would be appropriate.

In my practice, I consider diagnostic testing in patients who may be at risk for EPI and have mild symptoms such malodorous gas, bloating and mild steatorrhea. For patient with clear evidence of steatorrhea (weight loss and vitamin deficiencies) and have strong risk factors for EPI (i.e. heavy alcohol and tobacco and/or a history of recurrent or severe acute pancreatitis), I might consider imaging and/or empiric therapies as to expedite care.

How difficult is it to diagnose EPI and what steps do you take to ensure that you prescribe patients with the proper therapy?

Dr. Kothari: The diagnosis of pancreatic insufficiency, in my mind, needs to start with assessing the pre-test probability of the patient having EPI, since testing could lead to a false positive.

The test of choice in most scenarios for diagnosing pancreatic insufficiency is a stool test known as the fecal elastase. It is a measurement of pancreatic elastase in the stool. The test itself is a concentration. For any condition that results in a dilute stool sample, that'll result in a falsely low value that can give a patient a false positive test. Now, this can be corrected  by the lab concentrating the stool sample before running the test, but that testing center needs to know how to do that.

The other assumption that we make with this stool test is that we assume that the elastase is a stable molecule that can traverse all the gut and be collected adequately. And for any reason, if that enzyme is degraded for any reason, it's also going to provide a low test, a low result, resulting in a false positive.

If they have risk factors for chronic pancreatitis or pancreatic disease and they're presenting with symptoms of EPI, then the usual test that I'll choose is dedicated pancreatic imaging such as an MRI or dedicated CT pancreatic imaging, or endoscopic ultrasound. If we clinch a diagnosis of chronic pancreatitis and they have symptoms of pancreatic insufficiency, I think that’s enough to presume a diagnosis of exocrine pancreatic insufficiency and start treatment.

On the other hand, in patients who do not have risk factors for pancreatic disease but there remains some clinical suspicion for exocrine pancreatic insufficiency, then it may be reasonable to check a fecal elastase to rule out pancreatic insufficiency. If the test results are low, then follow-up dedicated pancreas imaging would be the next step in delineating intrinsic pancreatic conditions form extra-pancreatic causes.  If pancreas imaging effectively rules out pancreatic disease then I consider checking for celiac disease, ruling out small intestinal bacterial overgrowth and considering assessment of luminal motility (either with a capsule or small bowel follow through). Although functional neuroendocrine tumors have been previously considered a cause of EPI, these tumors tend to present with secretory diarrhea which typically present differently (and often more dramatically) than other causes of EPI. Thus, I do not routinely check vasoactive hormone levels.

I think the American Gastroenterological Association has great patient education documents for our patients. Thus, I would encourage our colleagues to use the AGA for their resources for our patients on EPI.