[Measurement of colon transit time useful in the evaluation of functional constipation].
OBJECTIVE: To determine the colon transit time (CTT) in patients complaining of functional constipation and the correlation between abnormal transit times and the types of constipation and of the symptoms. DESIGN: Retrospective, descriptive. SETTING: Department of Surgery, University Hospital, Nijmegen, the Netherlands. METHOD: The signs and symptoms of 112 patients with infrequent or difficult defaecation, 93 (83%) of them women, with a median age of 42 years (range: 16-72), were recorded by means of a questionnaire. After ingestion of radiopaque markers per day for 10 days, an abdominal survey X-ray was made on day 11. The numbers of markers in the X-ray and per segment (right and left hemicolon and rectosigmoid) were counted; the CTT in hours was calculated by multiplying this number by 2.4. Slowness was defined as more than 45 h for the total CTT and as more than 15 h for the segmental CTT. RESULTS: The total CTT was normal in 33 patients (29%) and prolonged in 79 (71%). The CTT was prolonged only in the rectosigmoid in 14 patients with a normal CTT (42%) and in 50 patients with a prolonged total CTT (63%). Of the patients with a normal total CTT, 13 (39%) had a normal segmental CTT. No statistically significant correlation could be demonstrated between the presence of any symptom and a prolonged CTT. CONCLUSION: Functional constipation may be associated with a normal CTT. Disorders of colonic motility and of rectal evacuation could be distinguished by measuring the total and the segmental colonic transit times.