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Abdominal pain after eating and weight loss: when narrowed intestinal arteries are the cause
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Chronic mesenteric ischemia (chronic intestinal ischemia) is a condition in which the intestine does not get enough blood after meals because its arteries are narrowed. Typical signs are abdominal pain 20–30 minutes after eating, fear of eating and weight loss. The disease is rare and often goes unrecognized for a long time; at the same time, a narrowed artery that causes no symptoms does not need treatment with a procedure.
What is chronic mesenteric ischemia?
The intestine is supplied by three arteries that branch off the abdominal aorta: the celiac trunk and the superior and inferior mesenteric arteries. They are linked to one another by natural bypass vessels, so narrowing of one artery is usually compensated for. Symptoms usually appear when at least two of the three arteries are significantly narrowed or blocked; narrowing of the superior mesenteric artery alone can cause them if the bypass vessels are poorly developed.
The most common cause is atherosclerosis at the origin of these arteries. Another cause is compression of the celiac trunk by a ligament of the diaphragm (Dunbar syndrome), described below.
Symptoms: pain after eating, fear of eating, weight loss
- Pain in the upper or middle abdomen 20–30 minutes after eating, lasting 1–2 hours
- Fear of eating and smaller portions to avoid the pain
- Weight loss with no other clear cause; what matters is the loss of weight itself, so being overweight does not rule out the disease
- Nausea, bloating, diarrhea or constipation
- Lengthy stomach and bowel tests that did not explain the symptoms
When to call an ambulance: acute mesenteric ischemia
Sudden, very severe abdominal pain, especially in someone with atrial fibrillation, atherosclerosis or known chronic mesenteric ischemia: call an ambulance (103 in Ukraine). The pain can be much worse than the examination suggests; vomiting, diarrhea or blood in the stool may follow. The pain may ease for a while — this is not a sign of improvement. Acute mesenteric ischemia is life-threatening, and treatment must begin as soon as possible.
Constant abdominal pain, even on an empty stomach or between meals, or rapid weight loss in someone with known narrowing of the intestinal arteries or typical pain after eating needs a doctor's assessment: seek medical care the same day.
Tests: fasting ultrasound of the arteries and CT angiography
The first test is a duplex ultrasound of the intestinal arteries on an empty stomach, at least 4 hours after eating; it is technically demanding and needs an experienced doctor. The main test for diagnosis and treatment planning is CT angiography.
Gastroscopy (upper endoscopy), colonoscopy and abdominal ultrasound are needed to rule out other causes of pain. Normal blood tests or a normal gastroscopy do not rule out mesenteric ischemia.
Who needs treatment, and who needs monitoring and medicines
Restoring blood flow is recommended when there are typical symptoms and severe narrowing of at least two arteries; with severe narrowing of the superior mesenteric artery alone, it should also be considered. With severe ischemia, treatment is not postponed “to gain weight first”.
If a narrowing is found by chance and there are no symptoms, no stent is placed: the doctor prescribes atherosclerosis prevention and explains which symptoms to watch for. Narrowing of only one artery rarely causes ischemia, so with atypical symptoms other causes are looked for first.
Stenting or open surgery
If the anatomy allows, stenting is the first-line method: a stent is placed in the narrowed segment through a puncture of an artery. Compared with open surgery, it has fewer complications and a shorter recovery; symptoms go away or improve substantially in most patients. On the other hand, symptoms come back less often after open bypass surgery, so it is considered when stenting is impossible or unsuccessful, and in some patients who are fit for a larger operation.
In about a quarter of patients symptoms return over time because the artery narrows again (restenosis), most often within the first year, so follow-up visits with ultrasound are needed after the procedure. A repeat narrowing that causes symptoms again is usually treated with another catheter (endovascular) procedure. If pain after eating comes back or you start losing weight again, do not wait for your scheduled follow-up visit.
Dunbar syndrome: compression of the celiac trunk
Compression of the celiac trunk by the median arcuate ligament of the diaphragm is often seen on CT and is usually harmless. The diagnosis of Dunbar syndrome (median arcuate ligament syndrome) is made only after other causes of pain have been ruled out, using strict criteria. Treatment is surgical division of the ligament, usually laparoscopic, and only in carefully selected patients; its benefit has not yet been fully proven. A stent in the celiac trunk is not used as the first-line method.
Frequently asked questions
How is chronic mesenteric ischemia different from acute?
Chronic ischemia develops gradually: pain after eating, fear of eating and weight loss go on for weeks and months. Acute ischemia starts suddenly with very severe abdominal pain and is life-threatening — if you suspect it, call an ambulance (103 in Ukraine).
A narrowed intestinal artery was found by chance and I have no symptoms. Do I need a stent?
No. Without symptoms, a narrowing is not treated with a procedure: the doctor prescribes atherosclerosis prevention, manages risk factors and explains which symptoms to watch for.
How do I prepare for an ultrasound of the intestinal arteries?
The scan is done on an empty stomach, at least 4 hours after your last meal; the day before, it is best to avoid foods that cause bloating. The doctor performing the scan will give you exact instructions.
My blood tests and gastroscopy are normal. Does that rule out mesenteric ischemia?
No. Blood tests and gastroscopy are needed to rule out other causes of pain. Narrowed intestinal arteries are found with an ultrasound of the arteries and CT angiography, and mesenteric ischemia is diagnosed when the narrowing matches the symptoms.
Can I gain weight first and have the procedure afterward?
With severe ischemia this is not recommended: until blood flow is restored, eating causes pain, and delaying treatment raises the risk of acute ischemia. Nutrition is improved after blood flow has been restored.
Is a stent used for Dunbar syndrome?
Not as the first-line method: compression of the celiac trunk by the ligament is relieved surgically by dividing the ligament. A stent is considered only if the narrowing and symptoms persist after the operation.
Book a consultation
Vascular surgeon consultation at the Shalimov Center, 30 Akademika Shalimova St, Kyiv. Booking and questions go through the contact doctor, Yurii Vahis. Patients from other cities and abroad can arrange an online consultation.