Difference between revisions of "Category:Intestine - Vascular Disturbances"

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==[[Intestinal Arterial Thromboembolism]] ==
 
==[[Intestinal Arterial Thromboembolism]] ==
  
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* Non-strangulation infarction.
 
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* There is often a functional obstruction at point of infarction.
 
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* Relatively rare as the bowel has a good anastomosing blood supply.
 
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[[Image:strongylus vulgaris.jpg|thumb|right|150px|Thrombosis of cranial mesenteric artery caused by Strongylus vulgaris larvae (Courtesy of Bristol BioMed Image Archive)]]
 
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===Horses===
 
  
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* E.g. [[Strongylus vulgaris|'''''Strongylus vulgaris''''']] larvae migrating in cranial mesenteric artery in horse
 
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** Cause arteritis with thickening of wall
 
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*** Due to fibrin and debris deposition and hypersensitivity reaction
 
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** Leads to vasoconstriction
 
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*** May occlude lumen and encourage thromboemboli.
 
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** Can cause ischaemic necrosis of a segment of [[Small Intestine - Anatomy & Physiology|small intestine]]
 
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** Is less common now that [[Strongylus vulgaris|'''''Strongylus vulgaris''''']]  infections are declining.
 
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* E.g. '''equine''' [[Intestines Fibrinous/Haemorrhagic Enteritis - Pathology#Salmonellosis|'''salmonellosis''']].
 
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[[Image:Infaction of the small bowel.jpg|thumb|right|150px|Infarction of the small bowel (Courtesy of Bristol BioMed Image Archive)]]
 
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===Small Animals===
 
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* Especially dogs
 
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* '''Road traffic accidents''' produce and infact in the gut.
 
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* '''Renal disease''' also causes infarction.
 
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** Particularly nephrotic syndrome.
 
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** Anticoagulant proteins are lost in the urine, leading to a prothrombic state in the ciruclation.
 
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===Pathology===
 
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* Similar to that caused by venous congestion.
 
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* See sharply delineated dark areas in bowel that are flaccid with loss of tone. 
 
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** These become necrotic followed later by peritonitis.
 
 
[[Category:Intestines,_Small_and_Large_-_Pathology]]
 
[[Category:Intestines,_Small_and_Large_-_Pathology]]

Revision as of 13:07, 1 June 2010

  • Vascular disturbances cause obstruction of efferent veins, blockage of afferent arteries or reduced blood flow through unobstructed circulation.
    • All have similar effects on the intestine

Effects of Intestinal Hypoxia

  • Intestinal hypoxia is induced by vasular distrubances (above).
  • Timescale:
    • 10 – 30 minutes - separation of epithelium from basement membrane.
    • 1 - 2 hours - villus destruction.
    • 2 hours - necrosis of crypt cells.
    • 4 - 5 hours - all mucosa necrotic, sloughed.

Intestinal Venous Congestion

Intestinal Arterial Thromboembolism

Pages in category "Intestine - Vascular Disturbances"

The following 2 pages are in this category, out of 2 total.

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