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Obstetrics & Gynecology 1972;40:627-633
© 1972 by The American College of Obstetricians and Gynecologists
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Intravesical and Intraurethral Pressure as a Measure of Urethral Sphincter Function

J. A. LOW, MD, FRCS(C) and MING-SHIAN KAO, MD, FRCS(C)

From the Department of Obstetrics and Gynecology, Queen's University, Kingston, Ontario, Canada.

Abstract

Intravesical and intraurethral pressures were determined in 91 patients with demonstrable urinary incontinence. Maximum and total urethral closure pressures were calculated at rest and with stress. The good correlation between decreasing maximum and total urethral closure pressures and the increasing severity of urinary incontinence, favor the concept that decreasing urethral resistence is the principal problem in urinary incontinence. Such pressure studies are an important component of the assessment of individual problems of urinary incontinence. A maximum urethral closure pressure of 60 cm of H2O and a total urethral closure pressure of 120 cm of H2O are useful indices to separate severely compromised from mildly or moderately compromised urethral sphincter function.






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