SHM's Clinical Quick Talks-Approach to Mesenteric Ischemia

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Mesenteric ischemia is inadequate intestinal blood flow that can progress to bowel ischemia, infarction, sepsis, and death. It is classified as acute or chronic, with acute mesenteric ischemia (AMI) requiring urgent recognition and treatment.

<strong>Acute mesenteric ischemia</strong> typically presents with sudden severe abdominal pain that is out of proportion to the physical exam, often with nausea, vomiting, diarrhea, abdominal distension, or hematochezia. Major causes include arterial embolism (often from atrial fibrillation), arterial thrombosis due to atherosclerosis, mesenteric venous thrombosis from hypercoagulability, and non-occlusive ischemia from shock or vasopressors. Early abdominal findings may be minimal, but later signs can include diffuse tenderness, guarding, rigidity, rebound, hypotension, and decreased bowel sounds.

<strong>Chronic mesenteric ischemia</strong> usually causes postprandial pain lasting up to 4 hours, food fear, weight loss, early satiety, and sometimes diarrhea or constipation. It is associated with older age and atherosclerotic risk factors such as tobacco use, hyperlipidemia, hypertension, diabetes, and peripheral arterial disease. Exam findings may be subtle, but cachexia, malnutrition, abdominal or carotid bruits, and diminished pulses may be present.

<strong>Diagnosis</strong> relies on urgent CT angiography (CTA) of the abdomen/pelvis, which may show vascular occlusion, bowel wall changes, thrombosis, pneumatosis, or portal venous gas. Labs include CBC, CMP, lactate, and blood gas, though normal lactate does not exclude ischemia. ECG, echocardiography, and hypercoagulability testing may be indicated.

<strong>Management</strong> requires immediate supportive care: NPO, IV fluids, broad-spectrum antibiotics, heparin unless contraindicated, and correction of shock or low-flow states. Early vascular or general surgery consultation is essential. Revascularization, including endovascular thrombectomy, is often needed for acute arterial occlusion, and surgery is urgent if there is peritonitis, infarction, or perforation.

Key pearl: pain out of proportion to exam should raise strong suspicion for AMI, and CTA should not be delayed.

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Rahul Ramakrishnan, Kevin Kuang, Tyler McMillan

Meta Tag

Concept Acute Mesenteric Ischemia

Concept Pain out of proportion

Concept Computed Tomography Angiography

Concept Chronic Mesenteric Ischemia

Concept Surgical Consultation

Keywords

mesenteric ischemia

acute mesenteric ischemia

chronic mesenteric ischemia

abdominal pain out of proportion

CTA abdomen pelvis

arterial embolism

mesenteric venous thrombosis

bowel infarction

revascularization

heparin

Acute Mesenteric Ischemia

Pain out of proportion

Computed Tomography Angiography

Chronic Mesenteric Ischemia

Surgical Consultation