Bowel preparation affects the amplitude and spatiotemporal organization of colonic propagating sequences
Version of Record online: 24 FEB 2010
© 2010 Blackwell Publishing Ltd
Neurogastroenterology & Motility
Volume 22, Issue 6, pages 633–e176, June 2010
How to Cite
Dinning, P. G., Zarate, N., Szczesniak, M. M., Mohammed, S. D., Preston, S. L., Fairclough, P. D., Lunniss, P. J., Cook, I. J. and Scott, S. M. (2010), Bowel preparation affects the amplitude and spatiotemporal organization of colonic propagating sequences. Neurogastroenterology & Motility, 22: 633–e176. doi: 10.1111/j.1365-2982.2010.01480.x
- Issue online: 4 MAY 2010
- Version of Record online: 24 FEB 2010
- Received: 15 September 2009 Accepted for publication: 19 January 2010
- bowel preparation;
- propagating sequence
Background Colonic manometry is performed using either colonoscopically assisted catheter placement, after bowel preparation, or nasocolonic intubation of the unprepared bowel. There has been little systematic evaluation of the effects of bowel cleansing upon colonic propagating pressure wave sequences.
Methods Eight healthy volunteers underwent nasocolonic placement of a water-perfused silicone catheter which recorded pressures at 16 recording sites each spaced 7.5 cm apart in the unprepared colon for 24 h. These measures were compared with those obtained in another eight healthy volunteers in whom the catheter was placed to the caecum at colonoscopy in the prepared colon.
Key Results The colonic motor responses to meals and morning waking, and the normal nocturnal suppression did not differ between the two groups, nor were the overall frequency, regional dependence nor extent of propagating sequences (PS) influenced by bowel preparation. Bowel preparation did result in a significant increase in the frequency of high amplitude PS (22 ± 7 vs 8 ± 4 HAPS/24 h; P = 0.003). Additionally, a number of the measures of spatiotemporal organization among consecutive PS (linkage among sequences and predefecatory stereotypical patterning) were significantly altered by bowel preparation.
Conclusions & Inferences The overall frequency of PSs, the colonic responses to physiological stimuli such a meal and morning waking and nocturnal suppression, are not influenced by prior bowel preparation. However, investigators wishing to study HAPS frequency, or the more complex spatiotemporal relationships among consecutive PSs, should control for bowel preparation when making comparisons among study groups.