The electromyographic activity of the external and internal urethral sphincters and urinary bladder on vaginal distension and its role in preventing vaginal soiling with urine during sexual intercourse.

Abstract:

BACKGROUND/AIM:We investigated the hypothesis that external (EUS) and internal (IUS) urethral sphincters and urinary bladder (UB) respond to penile thrusting (PT) of vagina in a way that prevents urinary leakage during coitus. METHODS:Vaginal condom was inflated with air in increments of 50-300 ml and EMG of EUS and IUS and vaginal pressure were recorded; test was repeated after anesthetization of vagina, UB, EUS, and IUS. RESULTS:Vaginal distension effected reduction of vesical pressure but increase of IUS EMG until the 150 ml distension was reached, beyond which more vaginal distension caused no further effect; EUS EMG showed no response. Vaginal distension while vagina, UB, EUS, and IUS had been separately anesthetized, produced no change. CONCLUSION:Vaginal balloon distension appears to effect vesical relaxation and increased IUS tone. This seems to provide a mechanism to avoid urine leakage during coitus and to occur through a reflex we term 'vagino-urethrovesical reflex'.

journal_name

Arch Gynecol Obstet

authors

Shafik A,Shafik AA,Shafik IA,El Sibai O

doi

10.1007/s00404-007-0456-8

subject

Has Abstract

pub_date

2008-03-01 00:00:00

pages

213-7

issue

3

eissn

0932-0067

issn

1432-0711

journal_volume

277

pub_type

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