Experimental Models of Neuropathic Fecal Incontinence: An Animal Model of Childbirth Injury to the Pudendal Nerve and External Anal Sphincter |
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Authors: | C F Healy C O’Herlihy C O’Brien P R O’Connell J F X Jones |
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Institution: | (1) Department of Surgery, Mater Misericordiae University Hospital, Dublin, Ireland;(2) Department of Obstetrics and Gynaecology, University College Dublin, Dublin, Ireland;(3) Conway Institute for Biomolecular and Biomedical Science, University College Dublin, Dublin, Ireland |
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Abstract: | Purpose Childbirth is the most common cause of fecal incontinence and damage to the pudendal nerve is a major component of childbirth
injury. This study was designed to develop an acute animal model of injury to the innervation of the external anal sphincter.
Methods Forty-eight female virgin wistar rats were studied. Two models of neuropathic injury were developed. Bilateral inferior rectal
nerve crush (Group A) acted as a positive control. Prolonged intrapelvic retrouterine balloon inflation (Group B) simulated
the pelvic compressive forces of labor. Quantitative analysis of external anal sphincter muscle function was performed by
using electromyography, external anal sphincter specific force production, and stereologic calculation of external anal sphincter
mass.
Results Injury in both groups caused significant atrophy of the external anal sphincter (P = 0.002, ANOVA) and electromyographic evidence of reinnervation at one week. Specific force (mN force per mg mass) was not
altered. External anal sphincter muscle mass recovered after four weeks in Group B.
Conclusions Balloon dilation within the boney pelvis results in denervation of the external anal sphincter and offers an experimental
model of the effects of childbirth on the continence mechanism in humans.
Supported by a grant from The Health Research Board, Ireland.
Presented at the meeting of The American Society of Colon and Rectal Surgeons, St. Louis, Missouri, June 2 to 6, 2007, and
was the winner of the Research Forum Prize. |
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Keywords: | Fecal incontinence Animal model Pudendal nerve injury |
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