Most common cause of acute mesenteric ischemia is
Aerial thrombosis
Venous thrombosis
Embolism
Non occlusive disease
.Superior mesenteric aery is commonly involved than inferior mesenteric aery. Often superior mesenteric vein can also get involved. Causes * Embolism (50%)--Sources - From left auricle, as seen in atrial fibrillation. - A mural infarct. - Atheroma from aoa or aneurysm. - Endocarditis vegetations. - Left atrial myxoma. * Thrombosis--may block the origin of the superior mesenteric aery and can cause ischaemia of full length of small bowel. It is life threatening. ref:SRB&;s manual of surgery,ed 3,pg no 806
G.I.T