OBJECTIVE: The purpose of this study was to determine whether thickness, fiber count, and density of urethral circular smooth muscle (CSM) differ in young and old women. STUDY DESIGN: Mid urethral hemiaxial sections from female cadavers aged 20-39 years (n = 12) and 70-89 years (n = 16) were stained for smooth muscle alpha actin. The CSM was studied at 0 degrees (pubic bone side) and 180 degrees (vaginal side) and in between at 45, 90, and 135 degrees. CSM layer width was measured; fibers were counted; density was calculated (fiber count/layer width). RESULTS: Density of urethral CSM was 25%-50% higher in specimens aged 20-39 years, compared with those aged 70-89 years. Differences were observed at 0, 135, and 180 degrees. In the younger group, higher fiber counts were observed at 135 and 180 degrees, and the CSM layer was thinner but not significantly so. CONCLUSION: The density of CSM was lower among older women, which may account for age-related decline in urethral closure pressure.
OBJECTIVE: The purpose of this study was to determine whether thickness, fiber count, and density of urethral circular smooth muscle (CSM) differ in young and old women. STUDY DESIGN: Mid urethral hemiaxial sections from female cadavers aged 20-39 years (n = 12) and 70-89 years (n = 16) were stained for smooth muscle alpha actin. The CSM was studied at 0 degrees (pubic bone side) and 180 degrees (vaginal side) and in between at 45, 90, and 135 degrees. CSM layer width was measured; fibers were counted; density was calculated (fiber count/layer width). RESULTS: Density of urethral CSM was 25%-50% higher in specimens aged 20-39 years, compared with those aged 70-89 years. Differences were observed at 0, 135, and 180 degrees. In the younger group, higher fiber counts were observed at 135 and 180 degrees, and the CSM layer was thinner but not significantly so. CONCLUSION: The density of CSM was lower among older women, which may account for age-related decline in urethral closure pressure.
Authors: Daniele Perucchini; John O L DeLancey; James A Ashton-Miller; Andrzej Galecki; Gabriel N Schaer Journal: Am J Obstet Gynecol Date: 2002-03 Impact factor: 8.661
Authors: Daniele Perucchini; John O L DeLancey; James A Ashton-Miller; Ursula Peschers; Tripti Kataria Journal: Am J Obstet Gynecol Date: 2002-03 Impact factor: 8.661
Authors: Elisa Rodriguez Trowbridge; John T Wei; Dee E Fenner; James A Ashton-Miller; John O L Delancey Journal: Obstet Gynecol Date: 2007-03 Impact factor: 7.661
Authors: Manju Aron; Sanghui Park; Brett M Lowenthal; Sounak Gupta; Debashis Sahoo; John C Cheville; Donna E Hansel Journal: Am J Surg Pathol Date: 2020-12 Impact factor: 6.394