This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Most common cause of acute mesenteric ischemia is: 
Select and explain. 
A. Arterial thrombosis, B. Venous thrombosis, C. Embolism, D. Non occlusive disease
C: Embolism
Answer: C: Embolism 
Explanation: Acute Mesenteric Ischemia :
• Emboli (50%) :
−− Arrhythmia, Valvular disease, Myocardial infarction
−− Hypokinetic ventricular wall
−− Cardiac aneurysm, Aortic atherosclerotic disease
• Thrombosis (25%) : Atherosclerotic disease
• Nonocclusive (5–15%) :
−− Pancreatitis, Heart failure, Sepsis.
−− Cardiac bypass, Burns, Renal failure.
• Venous occlusion:
−− Hypercoagulable state.
−− Sepsis Compression, Pregnancy, Portal hypertension.