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Measurement of colonic transit time in children.
Transit times through the whole colon and its segments were measured in 10 healthy children and 14 children suffering constipation secondary to myelomeningocele. The subjects ingested radio-opaque markers on three successive days, and on the fourth a plain abdominal roentgenogram was taken using fast film. In the healthy children, total colonic transit time (mean +/- SD) was 37.8 +/- 6.2 h, with segmental times of 10.8 +/- 3.5 h for the right colon, 12.2 +/- 2.7 h for the left, and 14.7 +/- 2.1 h for the rectosigmoid; upper normal limits of 17.8 h for the right colon, 17.6 h for the left, 19.1 h for the rectosigmoid, and 50.2 h for the total colonic transit time were established. In the constipated children, the total transit time was 59.9 +/- 5.4 h, with segmental times of 15.9 +/- 2.3 h for the right colon, 18.9 +/- 2.3 h for the left, and 25.0 +/- 2.6 h for the rectosigmoid. The technique described is simple, is easy to use in clinical practice, and involves a lower radiation dose than other methods. It may prove useful for measurement of colonic transit time in suitable patients.
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