Colonic response to laxative ingestion as assessed by MRI differs in constipated irritable bowel syndrome compared to functional constipation

Lam, C. and Chaddock, G. and Marciani, L. and Costigan, C. and Paul, J. and Cox, E. and Hoad, Caroline and Menys, A. and Pritchard, Susan E. and Garsed, K. and Taylor, S. and Atkinson, D. and Gowland, Penny A. and Spiller, Robin C. (2016) Colonic response to laxative ingestion as assessed by MRI differs in constipated irritable bowel syndrome compared to functional constipation. Neurogastroenterology and Motility, 28 (6). pp. 861-870. ISSN 1365-2982

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Abstract

Background

Functional constipation (FC) and irritable bowel syndrome with constipation (IBS-C) share many symptoms but underlying mechanisms may be different. We have developed a magnetic resonance imaging (MRI) technique to measure intestinal volumes, transit, and motility in response to a laxative, Moviprep®. We aim to use these biomarkers to study the pathophysiology in IBS-C and FC.

Methods

Twenty-four FC and 24 IBS-C were studied. Transit was assessed using the weighted average position score (WAPS) of five MRI marker pills, taken 24 h before MRI scanning. Following baseline scan, participants ingested 1 L of Moviprep® followed by hourly scans. Magnetic resonance imaging parameters and bowel symptoms were scored from 0 to 4 h.

Key Results

Weighted average position score for FC was 3.6 (2.5–4.2), significantly greater than IBS-C at 2.0 (1.5–3.2), p = 0.01, indicating slower transit for FC. Functional constipation showed greater fasting small bowel water content, 83 (63–142) mL vs 39 (15–70) mL in IBS-C, p < 0.01 and greater ascending colon volume (AC), 314 (101) mL vs 226 (71) mL in IBS-C, p < 0.01. FC motility index was lower at 0.055 (0.044) compared to IBS-C, 0.107 (0.070), p < 0.01. Time to first bowel movement following ingestion of Moviprep® was greater for FC, being 295 (116–526) min, compared to IBS-C at 84 (49–111) min, p < 0.01, and correlated with AC volume 2 h after Moviprep®, r = 0.44, p < 0.01. Using a cut-off >230 min distinguishes FC from IBS-C with low sensitivity of 55% but high specificity of 95%.

Conclusion & Inferences

Our objective MRI biomarkers allow a distinction between FC and IBS-C.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Medicine > Nottingham Digestive Diseases Centre
Identification Number: 10.1111/nmo.12784
Depositing User: Eprints, Support
Date Deposited: 03 Jan 2017 08:53
Last Modified: 12 Oct 2017 22:03
URI: http://eprints.nottingham.ac.uk/id/eprint/39537

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