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Pancreatitis occurs following activation of digestive enzymes within the pancreas leading to autodigestion of the gland. Can be referred to as acute or chronic pancreatitis.
Acute pancreatitis is rapid onset inflammation of the pancreas with little or no pathological changes occurring post recovery. This may completely resolve or 'wax and wane' in the future.
Chronic pancreatitis is continued inflammation leading to irreversible pathological changes (fibrosis, atrophy) and possible decreases in function.
The specific cause is usually idiopathic but several risk factors exist including:
A Nutritional basis which refers to obesity, low protein and high fat diets, feeding of ethionine and hypertriglyceridaemia.
Drugs and toxins including L-asparginase, oestrogen, azathioprine, potassium bromide, furosemide, thiazide diuretics, salicylates, tetracyclines, sulphonamides, vinca alkaloids, zinc toxicosis, cholinesterase inhibitor insecticides, cholinergic agonist and hypercalcaemia.
Pancreatic duct obstruction which is caused by biliary calculi, sphincter spasm, duct wall oedema, duodenal wall oedema, neoplasia, parasites, trauma and iatrogenic reasons.
Duodenal juice reflux, pancreatic trauma, ischaemia and reperfusion which includes duodenal juice reflux into the pancreatic duct, surgical intervention, shock, anaemia, venous occlusion and hypotension.
Other risk factors include parasitic (babesiosis), viral, mycoplasmal, end stage renal disease, liver disease and auto-immune diseases.
Cats mainly suffer from mild chronic interstitial pancreatitis.
Acute Haemorrhagic Pancreatitis
This term is often interchangeable with acute pancreatic necrosis or acute pancreatitis. The condition can be mild or severe, non-fatal or fatal. It usually occurs as a sudden onset condition, often after ingestion of a meal rich in fat, but this depends on what species the condition occurs.
The Islets of Langerhans may become involved thus causing the signs if insulin insufficiency. Pancreatitis may be initiated by trauma which initiates the leakage of enzymes. It can also present as recurrent acute pancreatitis - repeated inflammation with minimal permanent pathology. In the disease process, proteolytic degradation of pancreatic parenchyma, vascular damage and haemorrhage occur as well as necrosis of fat by lipolytic enzymes in the pancreas and surrounding omentum. These changes are concentrated at the periphery of lobules and infiltration by leukocytes indicates inflammation. In mild cases oedema of the interstitial tissue occurs. In more severe cases the pancreas is haemorrhagic and oedematous with greyish white areas of necrosis and this may be interspersed with normal parenchyma. The peritoneal cavity may contain blood-stained fluid sometimes with droplets of fat. Due to these large amounts of necrotic debris, infection by microorganisms from the GIT is likely, causing abscesses.
Cats and Dogs
In horses, necrosis and inflammation results due to migration of parasites, usually strongyle larvae, releasing pancreatic enzymes causing autodigestion. Destructive granulomatous pancreatitis is a part of multisystemic eosinophilic epitheliotrophic syndrome.
In pigs suppuration of the pancreas can occasionally arise as an extension from nearby infection, eg. peritonitis and perforated oesophageal ulcers.
Chronic Interstitial Pancreatitis
Chronic pancreatitis often occurs following ongoing inflammation with progression to irreversible damage and impaired function. There is usually fibrosis and reduction in acinar mass. This condition can occur in all species as a consequence of obstruction of the pancreatic ducts, vitamin A deficiency may predispose to this. The condition is most common in the dog, but also in cat, horse and cattle. The islets of Langerhans tend to be preserved. If chronic pancreatitis persisits it can lead to Exocrine Pancreatic Insufficiency (EPI). In cats, chronic pancreatitis can also lead to Diabetes Mellitus developing.
Cats and Dogs
Chronic pancreatitis can occur sporadically and is usually a consequence of parasitic migration or from ascending bacterial infection of pancreatic ducts. It can occur alongside chronic eosinophilic gastroenteritis and is usually clinically silent. Organ tends to be replaced by scar tissue.
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|Sample Book Chapters|
Andrews, A.H, Blowey, R.W, Boyd, H and Eddy, R.G. (2004) Bovine Medicine (Second edition), Blackwell Publishing
Bertone, J. (2006) Equine Geriatric Medicine and Surgery, Elsevier
Blood, D.C. and Studdert, V. P. (1999) Saunders Comprehensive Veterinary Dictionary (2nd Edition), Elsevier Science
Brown, C.M, Bertone, J.J. (2002) The 5-Minute Veterinary Consult- Equine, Lippincott, Williams & Wilkins
Cowart, R.P. and Casteel, S.W. (2001) An Outline of Swine diseases: a handbook, Wiley-Blackwell
Ettinger, S.J. and Feldman, E. C. (2000) Textbook of Veterinary Internal Medicine Diseases of the Dog and Cat Volume 2 (Fifth Edition), W.B. Saunders Company
Ettinger, S.J, Feldman, E.C. (2005) Textbook of Veterinary Internal Medicine (6th edition, volume 2), W.B. Saunders Company
Fossum, T. W. et. al. (2007) Small Animal Surgery (Third Edition), Mosby Elsevier
Hall, E.J, Simpson, J.W. and Williams, D.A. (2005) BSAVA Manual of Canine and Feline Gastroenterology (2nd Edition), BSAVA
Jackson, G.G. and Cockcroft, P.D. (2007) Handbook of Pig Medicine, Saunders Elsevier
Knottenbelt, D.C. A Handbook of Equine Medicine for Final Year Students University of Liverpool
Merck & Co (2008) The Merck Veterinary Manual Merial
Nelson, R.W. and Couto, C.G. (2009) Small Animal Internal Medicine (Fourth Edition) Mosby Elsevier
Sturgess, K. (2003) Notes on Feline Internal Medicine Blackwell Publishing
Tilley, L.P. and Smith, F.W.K.(2004) The 5-minute Veterinary Consult (Third edition) Lippincott, Williams & Wilkins
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