Chronic mesenteric ischemia: how to select patients for invasive treatment.

Chronic mesenteric ischemia (CMI) remains a well-described disease process that is difficult to diagnose. Since its initial description more than a century ago, a myriad of diagnostic and treatment modalities have been applied to ameliorate the classic symptoms of postprandial abdominal pain and weight loss. It is estimated that mesenteric occlusive disease affects approximately 1% to 18% of the population, with a majority of these patients manifesting no symptoms of CMI. While associated with a small prevalence, the potential economic impact of this disease process, with the increasing age of the population and the catastrophic outcomes associated with no treatment, is significant. The primary etiology of CMI is atherosclerotic occlusive disease involving the ostia of the mesenteric arteries. Several studies have investigated the pathophysiology of the postprandial abdominal pain associated with ischemia focusing on transport mechanisms, claudication of the intestinal musculature, and ischemia of the visceral nerves. The process of diagnosing CMI involves assimilation of the presentation, typical history and physical examination findings, and results of imaging modalities. At the end of this diagnostic process, the decision to offer a patient surgical intervention is primarily based on symptomatology and results of duplex and other imaging modalities. There are specific criteria for which to offer symptomatic patients interventions. Patients who are asymptomatic do not need to undergo revascularization, which may disrupt collateral arterial circulation to the mesentery. They should be followed conservatively.