Ischemic Bowel Disease
Reduced blood flow to the intestine
Quick Facts
- Type: Digestive and vascular condition
- Underlying problem: Reduced blood flow to the bowel
- Warning sign: Sudden, severe abdominal pain
- Can be: A medical emergency
Overview
Ischemic bowel disease occurs when blood flow to part of the intestine is reduced or blocked, depriving the tissue of the oxygen it needs. Depending on which blood vessels are affected and how quickly the blockage develops, the condition can range from a temporary, recoverable problem to a life-threatening emergency.
The intestine can be affected in different ways. Ischemic colitis involves the large intestine and is often less severe, while mesenteric ischemia affects the small intestine and can be sudden and dangerous. Because cut-off blood flow can rapidly damage or kill bowel tissue, sudden severe abdominal pain should never be ignored.
Symptoms
Symptoms depend on which part of the bowel is affected and how fast the blood flow is reduced.
- Abdominal pain, which may be sudden and severe or come and go after eating
- Pain that is out of proportion to what the exam shows (a classic warning sign)
- An urgent need to have a bowel movement
- Blood in the stool or bloody diarrhea
- Nausea, vomiting, and bloating
- Fever
Seek emergency care for sudden, severe, constant abdominal pain, especially with vomiting or bloody stools, as this can signal a surgical emergency.
Causes
Ischemic bowel disease results from anything that reduces blood flow to the intestine. Causes include:
- A blood clot blocking an artery or vein that supplies the bowel, sometimes traveling from the heart.
- Narrowed arteries from atherosclerosis (fatty buildup), which can cause chronic, recurring symptoms.
- Low blood pressure or shock, which reduces overall blood flow, often in seriously ill people.
- A twisted bowel or hernia that pinches off the blood supply.
- Certain medications that constrict blood vessels.
Risk Factors
- Older age
- Heart conditions such as atrial fibrillation, which can throw clots
- Atherosclerosis, high cholesterol, high blood pressure, and smoking
- Diabetes
- Blood-clotting disorders
- Serious illness with low blood pressure or shock
Diagnosis
Because the condition can be urgent, diagnosis often proceeds quickly using imaging and blood tests. These may include:
- CT scan, often with contrast dye: The main test to assess the bowel and its blood vessels.
- Blood tests: To look for signs of tissue damage and infection.
- Colonoscopy: To view the lining of the large intestine in suspected ischemic colitis.
- Angiography: Imaging of the bowel's arteries to find a blockage.
Treatment
Treatment depends on the cause, the part of bowel involved, and how severe the damage is.
- Restoring blood flow: Medications to dissolve or prevent clots, or procedures to open or bypass blocked arteries.
- Supportive care: Intravenous fluids, oxygen, and bowel rest; milder ischemic colitis often recovers with this alone.
- Antibiotics: To treat or prevent infection.
- Emergency surgery: To remove dead bowel and repair the blood supply when tissue has died; this can be life-saving.
- Treating underlying conditions: Such as an irregular heartbeat or atherosclerosis, to prevent recurrence.
Prevention
- Manage heart conditions and take blood thinners as prescribed if you are at risk of clots
- Control blood pressure, cholesterol, and diabetes
- Do not smoke
- Eat a heart-healthy diet and stay active to protect your blood vessels
- Seek prompt care for severe abdominal pain rather than waiting
When to See a Doctor
Call emergency services or go to the nearest emergency department for sudden, severe, constant abdominal pain, especially with vomiting, bloody stools, or pain that seems worse than the physical exam suggests. Cut-off blood flow to the bowel is a medical emergency, and prompt treatment can save tissue and lives.
See a doctor without delay for recurring abdominal pain after meals, unexplained weight loss, or blood in the stool, which can signal narrowing of the bowel's arteries that needs evaluation.
Frequently Asked Questions
What is ischemic bowel disease?
It is a condition in which blood flow to part of the intestine is reduced or blocked, starving the tissue of oxygen. This can range from a temporary, recoverable problem in the large intestine to a life-threatening emergency in the small intestine.
What causes reduced blood flow to the bowel?
Common causes include a blood clot blocking a bowel artery or vein, narrowed arteries from fatty buildup, very low blood pressure during serious illness, and a twisted bowel or hernia that pinches off blood flow.
Why is ischemic bowel disease an emergency?
When blood flow is suddenly cut off, the affected bowel can be damaged or die within hours, leading to infection and severe illness. Sudden, severe, constant abdominal pain, especially with vomiting or bloody stools, needs emergency care right away.
What is the difference between ischemic colitis and mesenteric ischemia?
Ischemic colitis affects the large intestine and is often less severe, frequently recovering with supportive care. Mesenteric ischemia affects the small intestine, is often sudden and dangerous, and may require urgent surgery.
Can ischemic bowel disease be prevented?
You can lower your risk by managing heart conditions and clotting risks, controlling blood pressure, cholesterol, and diabetes, not smoking, and seeking prompt care for severe abdominal pain rather than waiting it out.
References
- Mayo Clinic. Intestinal ischemia — Symptoms and causes.
- MedlinePlus, U.S. National Library of Medicine.
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK).
- American College of Gastroenterology (ACG).