37 patients,aged between 26 days 7 years,with chronic constipation were studied with anorectal electromyography(AEMG),barium enema and rectal mucosal ACHE histochemistry assay.Based on histochemical assay,the accuracy rate of diagnosis of Hirschsprung's disease by AEMG and barium enema was 81.1% and 78.4% respectively.Barium enema had a higher misdiagnosis rate in the group under 6 months than that in the group over 6 months(p＜0.05),but no significant difference was noticed between these two age groups when measured by AEMG.15 cases were prored to have Hirschsprung's disease by all the 3 methods.Of the 49 cases examined by AEMG,37 manifested the same abnormal changes as shown by barium enema.It turned out that AEMG is an effective screening method in differential diagnosis of chronic constipat.ion in children and more reliable in young babies than barium enema.Length of aganglionic segment can be evaluated by it in most patients.%@@ 便秘是常见的小儿消化道症状,可由许多原因引起.对持续或反复便秘,应考虑先天性巨结肠症,确诊有待多处做直肠活检,但这种检查损伤大,有一定危险性.国内多数医院主要靠病史、体征及X线检查来诊断.我们于1984年8月以来用直肠肛管肌电图(简称肌电图)、钡灌肠和直肠粘膜乙酰胆碱酯酶组织化学(简称组化)三种方法检查了37例慢性便秘患儿,以组化检查为基础,对照比较肌电图和钡灌肠的临床价值.现将结果报告如下.
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