571,163views
00:00 / 00:00
of complete
of complete
Laboratory value | Result |
Calcium, serum | 7.6 mg/dL |
Partial thromboplastin time | 60 seconds |
Prothrombin time | 28 seconds |
2024
2023
2022
2021
chronic pancreatitis and p. 404
pancreatic insufficiency from p. 388
chronic pancreatitis p. 404
Chronic 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.
Normally, trypsinogen isn’t activated until it is cleaved by protease enteropeptidase which is found in the duodenum.
But if trypsinogen and these zymogens become activated too early, then it can cause acute pancreatitis, and this might happen as a result of any injury to the acinar cells, or anything that prevents the normal secretion of the proenzymes into the duodenum.
Copyright © 2024 Elsevier, its licensors, and contributors. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Cookies are used by this site.
USMLE® is a joint program of the Federation of State Medical Boards (FSMB) and the National Board of Medical Examiners (NBME). COMLEX-USA® is a registered trademark of The National Board of Osteopathic Medical Examiners, Inc. NCLEX-RN® is a registered trademark of the National Council of State Boards of Nursing, Inc. Test names and other trademarks are the property of the respective trademark holders. None of the trademark holders are endorsed by nor affiliated with Osmosis or this website.