Blind loop syndrome occurs when part of the intestine becomes bypassed. Digested food slows or stops moving through part of the intestines. This causes bacteria to grow too much in the intestines and leads to problems in absorbing nutrients.
The name of this condition refers to the "blind loop" formed by the bypassed intestine. This blind loop does not allow digested food to flow normally through the intestinal tract.
When a section of the intestine is affected by blind loop syndrome, the bile salts needed to digest fats become ineffective. This leads to fatty stools and poor absorption of fat and fat-soluble vitamins. Vitamin B12 deficiency may occur because the extra bacteria that develop in this situation use up all of the vitamin.
Blind loop syndrome is a complication that occurs:
During a physical examination, the doctor may notice a mass in, or swelling of, the abdomen. Possible tests include:
Treatment generally starts with antibiotics for the excess bacteria growth, along with vitamin B12 supplements. If antibiotics don't work, surgery to help the food flow through the intestine may be considered.
Many patients get better with antibiotics. If surgical repair is needed, the outcome is usually very good.
Call your health care provider if you have symptoms of blind loop syndrome.
Stasis syndrome; Stagnant loop syndrome
Semrad CE. Approach to the patient with diarrhea and malabsorption. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 142.
Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.
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