Zaslavsky C, da Silveira T R, Maguilnik I
Curso de Pós-Graduação em Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
J Pediatr Gastroenterol Nutr. 1998 Aug;27(2):138-42. doi: 10.1097/00005176-199808000-00002.
In most instances, constipation is considered idiopathic or functional. The total and segmental colonic transit time, traced by radio- opaque markers, makes possible the identification of the colon segment that has the motility alteration that causes constipation.
A study was performed of 13 adolescents, aged 12 to 18, with functional chronic constipation and 13 without constipation. In all of them the total and segmental colonic transit times were measured with radio-opaque markers. The adolescents ingested 20 markers each on three successive days, and on the fourth day a plain abdominal radiograph was performed.
In the nonconstipated adolescents the total colonic transit time (mean +/- SD) was 30.2 +/- 13.1 hours, in the right colon 5.7 +/- 3.9 hours, in the left colon 7.9 +/- 7.8 hours, and in the rectosigmoid 15.5 +/- 10.6 hours. In the constipated adolescents, the total colonic transit time was 58.3 +/- 17.4 hours, in the right colon 15.9 +/- 12.4 hours, in the left colon 14.7 +/- 13.4 hours, and in the rectosigmoid 17.2 +/- 16.2 hours. There was a statistically significant difference (p < 0.05) in the total colonic transit time, and in both the right and left colon transit times between constipated and nonconstipated adolescents.
The measurement of total and segmental colonic transit times is a simple method that allows one to distinguish constipation due to colonic dysfunction (right colon and left colon) from constipation due to distal obstruction (rectosigmoid).
在大多数情况下，便秘被认为是特发性或功能性的。通过不透X线标志物追踪全结肠及节段性结肠运输时间，有助于识别导致便秘的结肠动力改变节段。
对13名年龄在12至18岁的功能性慢性便秘青少年和13名无便秘青少年进行了一项研究。所有受试者均通过不透X线标志物测量全结肠及节段性结肠运输时间。青少年连续三天每天摄入20个标志物，第四天进行腹部平片检查。
在无便秘的青少年中，全结肠运输时间（均值±标准差）为30.2±13.1小时，右半结肠为5.7±3.9小时，左半结肠为7.9±7.8小时，直肠乙状结肠为15.5±10.6小时。在便秘青少年中，全结肠运输时间为58.3±17.4小时，右半结肠为15.9±12.4小时，左半结肠为14.7±13.4小时，直肠乙状结肠为17.2±16.2小时。便秘青少年与无便秘青少年在全结肠运输时间以及右半结肠和左半结肠运输时间上存在统计学显著差异（p<0.05）。
测量全结肠及节段性结肠运输时间是一种简单的方法，可用于区分因结肠功能障碍（右半结肠和左半结肠）导致的便秘与因远端梗阻（直肠乙状结肠）导致的便秘。
