Chronic pancreatitis
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Chronic pancreatitis
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Chronic pancreatitis
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Chronic pancreatitis
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| Laboratory value | Result |
| Calcium, serum | 7.6 mg/dL |
| Partial thromboplastin time | 60 seconds |
| Prothrombin time | 28 seconds |
Which of the following is the most likely etiology of this patient's diarrhea?
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CFTR gene p. 58
chronic pancreatitis and p. 406
Chronic pancreatitis p. 406
pancreatic insufficiency from p. 390
Steatorrhea
chronic pancreatitis p. 406
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Transcript
Content Reviewers
Rishi Desai, MD, MPHChronic pancreatitis is persistent, chronic inflammation of the pancreas often due to repeated bouts of acute pancreatitis.
While a history of acute pancreatitis might lead to chronic pancreatitis these diseases have distinct histopathologies.
Acute pancreatitis is inflammation caused by destruction of the pancreas by its own digestive enzymes—a process called autodigestion, and is generally reversible.
Chronic pancreatitis is inflammation due to irreversible changes to the pancreatic structure, like fibrosis, atrophy and calcification.
The pancreas is a long, skinny gland the length of a dollar bill and is located in the upper abdomen, or the epigastric region, behind the stomach. It plays endocrine roles—for example, alpha and beta cells make hormones like insulin and glucagon that are secreted into the bloodstream, but it also plays exocrine roles— for example, acinar cells make digestive enzymes that are secreted into the duodenum to help digest food.
These pancreatic digestive enzymes break down macromolecules like carbohydrates, lipids and proteins found in food, but these macromolecules are also found in the cells of the pancreas.
To protect the pancreas, the acinar cells manufacture inactive forms of the enzymes called proenzymes, or zymogens.
These zymogens are normally activated by proteases which cleave off a polypeptide chain, which is kind of like pulling the pin on a grenade.
For additional security, the zymogens are kept away from sensitive tissues in storage vesicles called zymogen granules, and are packaged with protease inhibitors that prevent enzymes from doing damage if they become prematurely active.
To digest a meal, these zymogens are released into the pancreatic duct, and delivered to the small intestine where they are activated by the protease trypsin.
Trypsin is a pancreatic digestive enzyme that is produced as the zymogen trypsinogen.
Sources
- "Robbins Basic Pathology" Elsevier (2017)
- "Harrison's Principles of Internal Medicine, Twentieth Edition (Vol.1 & Vol.2)" McGraw-Hill Education / Medical (2018)
- "Pathophysiology of Disease: An Introduction to Clinical Medicine 8E" McGraw-Hill Education / Medical (2018)
- "CURRENT Medical Diagnosis and Treatment 2020" McGraw-Hill Education / Medical (2019)
- "Spectrum of Causes of Pancreatic Calcifications" American Journal of Roentgenology (2002)
- "Smoking and Risk of Acute and Chronic Pancreatitis Among Women and Men" Archives of Internal Medicine (2009)
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