Which of the following is listed as a risk factor for mesenteric infarct?

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Mesenteric infarction can result from multiple pathways to reduce or cut off blood flow to the intestines: arterial blockage from emboli or thrombosis, disease-promoting factors that accelerate arterial disease, and conditions that favor venous thrombosis. An arterial embolus or in-situ thrombosis can directly occlude mesenteric vessels and cause sudden ischemia. Atherosclerosis narrows these vessels, making them prone to occlusion or inadequate perfusion, especially when blood flow demand increases. Smoking fuels atherothrombotic processes, increasing the risk of both arterial embolic events and thrombosis. After surgery, a hypercoagulable state or coagulopathy raises the risk of mesenteric venous thrombosis, another route to infarction.

Because each listed factor can contribute to mesenteric ischemia through different mechanisms, all of the above captures the full spectrum of risk, making it the best answer.