Changes

[[Image:intussuceptionphoto.jpg|thumb|right|150px|Intersusception (Courtesy of Bristol BioMed Image Archive)]]

[[Image:intussuceptionphoto.jpg|thumb|right|150px|Intersusception (Courtesy of Bristol BioMed Image Archive)]]

The proximal intestine invaginates into the adjacent distal portion, taking its mesenteric attachment with it. Compression of the mesenteric vessels obstructs venous drainage of the gut, resulting in venous congestion, leading to swelling and oedema.

The proximal intestine invaginates into the adjacent distal portion, taking its mesenteric attachment with it. Compression of the mesenteric vessels obstructs venous drainage of the gut, resulting in venous congestion, leading to swelling and oedema.

*** Inflammatory exudate from serous surface.

An inflammatory exudate is released from the serosal surface, fibrinous adhesions may form between surfaces making the structure irreducible this may progress to necrosis of the tissue.  

**** Fibrinous adhesions form between surfaces making structure irreducible.

There is functional obstruction to bowel.

* May progress to necrosis and gangrene of the tissue.  

May rupture, leading to peritonitis and death.  

* There is often functional obstruction to bowel.

*Associated with any condition that increases peristalsis  

* May rupture, leading to peritonitis and death.  

*Associated with anything that raises peristalsis e.g. change in diet, bacterial infection.

** Foreign body

** Foreign body

** Heavy parasitism

** Heavy parasitism

** Previous intestinal surgery

** Previous intestinal surgery

** Enteritis

** Intramural abscess/tumour

** Other motility disorders.

** Motility disorders.

** Change in diet

** Change in diet

** Bacterial infection

** Bacterial infection

===Surgery===

===Surgery===

[[Fluid Therapy|Fluid therapy]] and correction of electrolyte and acid-base derangements should be carried out prior to surgical correction.  Surgery is usually required to manually reduce or resect and anastomosis or both.  This decision depends on the viability of the intestines, as determined by the colour, vascular supply and presence or absence of peristalsis.  Risks of complications include dehiscence of site of anastomosis, [[Peritonitis - Cats and Dogs|peritonitis]], recurrence (11-20%, most common within 1-5 days post surgery), ileus, intestinal obstruction and [[Short Bowel Syndrome|short bowel syndrome]]. Recurrence can be treated with motility altering drugs or intestinal pexy or plication.  It is important to preserve as much of the intestine as possible to avoid [[Short Bowel Syndrome|short bowel syndrome]].

[[Fluid Therapy|Fluid therapy]] and correction of electrolyte and acid-base abnormalities should be carried out prior to surgical correction.  Surgery is usually required to manually reduce or resect and anastomosis or both.  This decision depends on the viability of the intestines, as determined by the colour, vascular supply and presence or absence of peristalsis.  Risks of complications include dehiscence of site of anastomosis, [[Peritonitis - Cats and Dogs|peritonitis]], recurrence (11-20%, most common within 1-5 days post surgery), ileus, intestinal obstruction and [[Short Bowel Syndrome|short bowel syndrome]]. Recurrence can be treated with motility altering drugs or intestinal pexy or plication.  It is important to preserve as much of the intestine as possible to avoid [[Short Bowel Syndrome|short bowel syndrome]].