title: Compliance, tone and sensitivity of the rectum in different subtypes of irritable bowel syndrome.
abstract: Irritable bowel syndrome (IBS) consists of various subtypes. It is not known whether these subtypes share a common pathophysiology. Evaluation of motor and sensory function of the rectum using a barostat may help to explore a common pathophysiological background or differences in pathophysiology in subtypes of IBS. We have evaluated compliance, tone and sensitivity of the rectum, in both fasting state and postprandially, using a computerized barostat in 15 patients with diarrhoea-predominant IBS (IBS-D), 14 patients with constipation-predominant IBS (IBS-C) and compared the results with those obtained in 12 healthy controls. Rectal compliance as calculated over the steep part of the pressure-volume curve (17-23 mmHg) was decreased in both IBS groups (IBS-D 8.0 +/- 1.4 mL mmHg-1; IBS-C 5.6 +/- 1.1 mL mmHg-1) compared with controls (24.7 +/- 3.5 mL mmHg-1). The perception of urge was increased only in IBS-D patients, whereas pain perception was significantly increased in both IBS groups. Spontaneous adaptive relaxation was decreased in IBS-D patients. Postprandially, rectal volume decreased significantly in the controls and in IBS-D patients, but not in IBS-C patients. In conclusion, both rectal motor and sensory characteristics are different between IBS-D and IBS-C patients. Therefore, testing of rectal visceroperception, adaptive relaxation and the rectal response to a meal may help distinguish groups of patients with different subtypes of irritable bowel syndrome.
authors.affiliation: Department of Gastroenterology-Hepatology, Leiden University Medical Center, Leiden, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: Steens
authors.forename: P J
authors.initials: PJ
authors.lastname: Van Der Schaar
authors.forename: C
authors.initials: C
authors.lastname: Penning
authors.forename: J
authors.initials: J
authors.lastname: Brussee
authors.forename: A A M
authors.initials: AA
authors.lastname: Masclee
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D003109:Colonic Diseases, Functional / Q000145:classification* / Q000503:physiopathology*; D003187:Compliance; D003967:Diarrhea / Q000503:physiopathology; D005215:Fasting / Q000502:physiology; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement / Q000379:methods; D010465:Perception / Q000502:physiology; D019518:Postprandial Period / Q000502:physiology; D012007:Rectum / Q000502:physiology* / Q000503:physiopathology; D018709:Statistics, Nonparametric