Role of anorectal myectomy in the treatment of short segment Hirschsprung's disease in young adults.

Basic pathological disorder in Hirschsprung's disease (HD) comes into being by the abnormal innervations of the aganglionic distal intestine. The nonserious forms of this congenital disease may reach the young by proceeding with chronic, obstinate constipation that does not respond to diet. Myectomy of the short segment of aganglionic part may provide diagnostic and therapeutic value. Between 1993 and 2003, anorectal posterior myectomy was performed in 19 patients diagnosed with HD. The mean age of patients was 23 years. Previous or concomitant anterior resection was added to the procedure in seven cases due to dolicomegacolon. In addition to the deficiency of anorectal inhibitor reflex (ARIR) among all patients, the frequency of defecation was 12.5 days (range, 6-30 days) before operation. Anorectal length before widening was an average of 5.5 cm (range, 2-8 cm). All pathologic specimens were found to be aganglionic. Postoperatively, the mean of first regular defecation interval was 1.5 days (range, 1-3 days). Involution of rectum was evaluated with a rectal examination and barium enema X-rays during follow-up. ARIR of patients also returned to normal. In conclusion, anorectal posterior myectomy is an effective operation in diagnosis and treatment of short-segment HD. Furthermore, colon resection annexed to this operation, in the condition of dolicomegacolon, is also used to remove obstinate constipation.

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