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Am J Physiol Gastrointest Liver Physiol 280: G629-G639, 2001;
0193-1857/01 $5.00
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Vol. 280, Issue 4, G629-G639, April 2001

Ambulatory 24-h colonic manometry in healthy humans

Satish S. C. Rao, Pooyan Sadeghi, Jennifer Beaty, Renae Kavlock, and Kris Ackerson

Department of Internal Medicine and Clinical Research Center, University of Iowa, Iowa City, Iowa 52242

Our aim was to investigate motor activity of the healthy, relatively unprepared colon in the ambulatory state. Twenty-five age- and gender-matched adults had a six-sensor solid-state probe inserted into the proximal transverse colon without sedation. Subjects ambulated freely and ate standard meals. In 528 h of recording, we found a lower (P < 0.05) area under the curve during the night. Waking induced a threefold increase in motility, whereas meals induced a twofold increase. Women showed less activity (P < 0.05) in the transverse/descending colon than men. The transverse/descending colon showed more (P < 0.05) activity than the rectosigmoid colon. Seven patterns were recognized; predominantly, they were simultaneous, propagated, or periodic bursts of 3-cycles/min (cpm) waves. A specialized propagating pressure wave with a high amplitude (>105 mmHg) and a prolonged duration (>14 s) occurred in all subjects (mean 10/day), mostly after waking, after meals, or with defecation. A 3-cpm motor activity was seen in the rectosigmoid region predominantly at night. The colon exhibits a wide spectrum of pressure activity around the clock, with gender and regional differences and circadian rhythm. This comprehensive study provides qualitative and quantitative normative data for colonic manometry.

colon; motility; patterns


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