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Defecation mechanisms after proctocolectomy and ileal pouch–anal anastomosis in dogs

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International Journal of Colorectal Disease Aims and scope Submit manuscript

Abstract

Background and aims

The role of intrinsic pouch motility after ileal pouch–anal anastomosis (IPAA) during defecation is still speculative.

Materials and methods

IPAA was performed in 12 dogs. Defecation mechanisms were evaluated by motility recordings during spontaneous defecation and during expulsion of an endoluminal balloon and by radiography with sequential sector-related gray scale analysis.

Results

Spontaneous defecations appeared without significant changes in electrical or mechanical activity of the pouch. Sequential filling of the pouch led to defecation in only seven dogs while the others did not succeed in emptying their pouch even with maximal balloon inflation. Neither strain gauge measurements nor electromyography demonstrated peristaltic contractions of the pouch during defecation while sector-related gray scale analysis revealed strong contractions of the abdominal wall during pouch emptying.

Conclusion

Pouch emptying is independent of intrinsic pouch motility. The ileoanal pouch acts as a functionally passive reservoir, and its evacuation is initiated by a rise of the intra-abdominal pressure.

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Acknowledgements

This study was supported by a grant of Deutsche Forschungsgemeinschaft (DFG Wi 1228/2-1). Parts of this work have been presented at the meeting of the German Society of Surgery, Berlin, May 2002.

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Authors and Affiliations

  1. Department of Surgery, Technical University Aachen, Pauwelsstrasse 30, 52057, Aachen, Germany

    S. Willis, F. Hölzl, V. von Felbert, V. Fackeldey & V. Schumpelick

  2. Department of Diagnostic Radiology, Technical University Aachen, Pauwelsstrasse 30, 52057, Aachen, Germany

    B. Wein

Authors
  1. S. Willis
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  2. F. Hölzl
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  3. B. Wein
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  4. V. von Felbert
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  5. V. Fackeldey
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  6. V. Schumpelick
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Correspondence to S. Willis.

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Willis, S., Hölzl, F., Wein, B. et al. Defecation mechanisms after proctocolectomy and ileal pouch–anal anastomosis in dogs. Int J Colorectal Dis 19, 228–233 (2004). https://doi.org/10.1007/s00384-003-0540-x

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  • DOI: https://doi.org/10.1007/s00384-003-0540-x

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