Mesenteric ischemia

Mesenteric ischemia occurs when blood flow to the intestines is reduced or blocked, often due to narrowed or blocked mesenteric arteries. This condition can range from a slow, chronic process to a sudden medical emergency, and it can cause serious damage to the intestines if left untreated. With prompt diagnosis and the right care team, many people can restore blood flow and protect their digestive health.

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Medical illustration showing the aorta and major branching arteries.

Anatomy of the mesenteric arteries

Your intestines depend on a steady supply of oxygen-rich blood delivered through the mesenteric arteries, which branch off the aorta, the body's main artery. These vessels work alongside the rest of your cardiovascular system, including the heart and blood vessels, to keep blood circulating efficiently throughout your digestive organs.

When mesenteric artery stenosis, or narrowing of these arteries, develops, it can restrict blood flow to the intestines. This narrowing may build gradually, leading to chronic mesenteric ischemia, or it can happen suddenly if a blood clot blocks an artery, causing acute mesenteric ischemia. Because the intestines are sensitive to changes in blood supply, reduced circulation can quickly affect digestion and, in severe cases, the health of the intestinal tissue itself.

Overview

Symptoms

Symptoms of mesenteric ischemia can vary depending on whether the condition develops gradually or suddenly. Common signs include:

Abdominal pain, often after eating
Unintended weight loss
Fear of eating due to pain, sometimes called food aversion
Nausea or vomiting
Diarrhea
Sudden, severe abdominal pain, which may signal acute mesenteric ischemia

Chronic symptoms tend to build slowly over weeks or months, while acute symptoms can come on quickly and require immediate medical attention.

Causes

Mesenteric ischemia develops when blood flow to the intestines is disrupted. Common causes include:

Buildup of plaque in the mesenteric arteries, known as atherosclerosis, which narrows the vessels over time
A blood clot that suddenly blocks a mesenteric artery
Low blood pressure or reduced blood flow from other health conditions
Blockages in the veins that drain blood from the intestines

The underlying cause often determines whether the condition develops gradually or requires urgent treatment.

Risk factors

Certain factors can increase your likelihood of developing mesenteric ischemia, though having one or more of these doesn't mean you'll develop this condition:

Atherosclerosis or other forms of vascular disease
A history of heart disease or irregular heart rhythms
Smoking
High blood pressure or high cholesterol
Older age
A history of blood clots

Knowing your risk factors can help you and your care team make informed decisions about prevention and monitoring.

Diagnosis

Diagnosing mesenteric ischemia typically starts with a conversation about your symptoms and medical history, followed by a physical exam. Because symptoms can overlap with other digestive conditions, imaging tests are often needed to confirm the diagnosis. Common tests include:

CT angiography, which creates detailed images of the mesenteric arteries to identify blockages or narrowing
Duplex ultrasound, which uses sound waves to evaluate blood flow through the mesenteric arteries
Mesenteric angiography, which provides a detailed view of the arteries and can help guide treatment planning

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