Chronic mesenteric ischemia !

Narrowed gut arteries cannot carry enough blood after meals, so eating causes belly pain. People eat less from fear of pain and lose weight.

Updated 2026-11-01

Structures involved

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Why it happens

What it is

Recurrent intestinal ischaemia caused by gradual narrowing of the mesenteric arteries, usually from atherosclerosis. Because the gut has rich collaterals, symptoms usually appear only when at least two of the three main vessels (coeliac trunk, superior and inferior mesenteric arteries) are severely narrowed or occluded.

Who gets it

Uncommon; it typically affects people over 60, more often women, with atherosclerosis elsewhere (coronary, carotid or leg arteries). Diagnosis is often delayed for months because the symptoms are mistaken for peptic or biliary disease or cancer. With population ageing, smoking and diabetes in Colombia and Latin America, it is likely under-recognised.

Causes

Atherosclerosis at the origin of the mesenteric arteries (most common)
Vasculitis, such as Takayasu arteritis
Fibromuscular dysplasia
Median arcuate ligament compression of the coeliac trunk
Aortic dissection extending into the mesenteric vessels

Risk factors

Smoking
Arterial hypertension
Dyslipidaemia
Diabetes mellitus
Older age
Known peripheral, coronary or carotid artery disease

Pathophysiology

After a meal, intestinal blood flow normally rises sharply. Fixed stenoses prevent this increase, so the mucosa becomes ischaemic during digestion, much as stable angina appears with exercise ('intestinal angina'). Pain leads to food avoidance and weight loss; chronic underperfusion may also impair absorption. A narrowed artery can thrombose suddenly, converting the chronic disease into acute mesenteric ischaemia.

Classification

Atherosclerotic versus non-atherosclerotic (vasculitis, fibromuscular dysplasia, extrinsic compression)
By vessels involved: single-vessel versus multivessel disease
Acute-on-chronic mesenteric ischaemia

Symptoms and signs

Postprandial abdominal pain starting 15–60 minutes after eating and lasting a few hours
Fear of eating (sitophobia) and smaller meals
Unintentional weight loss
Nausea, diarrhoea or bloating
Abdominal bruit in some patients

Diagnosis

Clinical: Classic triad: postprandial pain, food fear and weight loss, in an older smoker with vascular disease. Other causes such as cancer and peptic or biliary disease are usually excluded in parallel.
Tests: Laboratory tests are often normal; they may show malnutrition (low albumin). Endoscopy helps exclude other diagnoses and may show ischaemic gastritis or colitis.
Imaging: CT angiography is the first-line test and shows stenosis or occlusion of the coeliac trunk and mesenteric arteries and collaterals. Duplex ultrasound is a useful screening test. Catheter angiography is reserved for treatment planning and endovascular therapy.

Differential diagnosis

Gastric or pancreatic cancer
Peptic ulcer disease
Biliary colic or chronic cholecystitis
Chronic pancreatitis
Median arcuate ligament syndrome
Functional dyspepsia or irritable bowel syndrome

Goal of treatment

Restore blood flow to the intestine to relieve pain, recover weight and prevent progression to acute bowel infarction, while treating the systemic atherosclerosis.

Treatment

Procedure: Endovascular revascularisation (angioplasty and stenting, usually of the superior mesenteric artery) is the usual first choice in most patients.
Surgical: Open surgical revascularisation (bypass or endarterectomy) for lesions unsuitable for stenting, younger fit patients or recurrent stenosis.
Medical: Secondary prevention of atherosclerosis: antiplatelet agents and statins, with control of blood pressure and diabetes; nutritional support, sometimes parenteral, in malnourished patients before revascularisation.
Lifestyle: Stopping smoking, small frequent meals while awaiting revascularisation, and a heart-healthy diet.
Follow-up: Follow-up with duplex ultrasound to detect restenosis; nursing priorities include weight and nutritional status and teaching to report recurrent postprandial pain.

Complications

Acute mesenteric ischaemia and bowel infarction
Severe malnutrition and cachexia
Restenosis after stenting
Ischaemic colitis

Prognosis

Relief of symptoms after successful revascularisation is good, but restenosis is common after stenting and needs surveillance. Untreated disease can progress to bowel infarction, which carries high mortality. Long-term survival is limited by coexisting coronary and cerebrovascular disease.

Prevention

Not smoking
Control of blood pressure, cholesterol and blood sugar
Regular physical activity and a healthy diet

Test yourself

Think of the answer, then tap the question to see it.

What is the classic clinical triad of chronic mesenteric ischaemia?

Postprandial abdominal pain, fear of eating (sitophobia) and weight loss.

Why do symptoms usually require disease in more than one mesenteric vessel?

The coeliac, superior and inferior mesenteric territories are linked by rich collaterals, so a single stenosis is often compensated.

What is the first-line imaging test for suspected chronic mesenteric ischaemia?

CT angiography of the abdominal aorta and its visceral branches.

What is the usual first-line treatment in most patients with symptomatic disease?

Endovascular revascularisation (angioplasty and stenting), with open bypass for unsuitable lesions.

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Educational information, not medical advice. For any symptom, see a health professional.

Sources: Mesenteric artery ischemia: MedlinePlus Medical Encyclopedia (MedlinePlus (U.S. National Library of Medicine), 2024); Management of the Diseases of Mesenteric Arteries and Veins: Clinical Practice Guidelines of the European Society of Vascular Surgery (ESVS) (European Journal of Vascular and Endovascular Surgery, 2017).

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Representative model, for educational purposes only.

Superior mesenteric artery highlighted on the Durgical 3D model