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• W3718719 abstract "No AccessJournal of Urology1 Apr 1994Effects of Beta2-Stimulants on Contractility and Fatigue of Canine Urethral Sphincter T. Yamanishi, K. Yasuda, M. Tojo, T. Hattori, R. Sakakibara, and J. Shimazaki T. YamanishiT. Yamanishi More articles by this author , K. YasudaK. Yasuda More articles by this author , M. TojoM. Tojo More articles by this author , T. HattoriT. Hattori More articles by this author , R. SakakibaraR. Sakakibara More articles by this author , and J. ShimazakiJ. Shimazaki More articles by this author View All Author Informationhttps://doi.org/10.1016/S0022-5347(17)35184-4AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail The effects of β2-stimulants [clenbuterol (CB) and terbutaline (TB)] on the contractility of the urethral sphincter of female dogs were studied by measuring intraurethral pressure (IUP) during stimulation of bilateral pudendal nerves. In nine dogs 1, 10 and 100μg./kg. of CB were administered, but no changes in IUP were observed. In the other 33 dogs, sphincteric fatigue was experimentally prepared by electrically stimulating the pudendal nerves at 15V, 20Hz for 30 to 40 minutes. In fatigued sphincters, CB (n=17) and TB (n=7) increased the contracting pressure (pressure difference between stimulation-generated peak level and baseline level of IUP). The inotropic effect of β2-stimulant (TB) on the fatigued urethral sphincter was abolished by a β-blocker, propranolol. From the present study it was concluded that β2-stimulants have little effect on the total contractility of the nonfatigued urethral sphincter because it is composed of smooth and striated muscles (fast- and slow-contracting muscles). However, β2-stimulants enhanced the contractility of fatigued urethral sphincter. These results suggest that β2-stimulants act on fast-contracting fibers in the urethral sphincter because the inotropic effect of sympathomimetic amine is much greater on fatigued, fastcontracting fibers than on nonfatigued ones and its depressive effect on slow-contracting fibers is not potentiated after fatigue. © 1994 by The American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetailsCited ByYAMANISHI T, CHAPPLE C, YASUDA K, YOSHIDA K and CHESS-WILLIAMS R (2018) The Functional Role of β-Adrenoceptor Subtypes in Mediating Relaxation of Pig Urethral Smooth MuscleJournal of Urology, VOL. 170, NO. 6, (2508-2511), Online publication date: 1-Dec-2003.TAKEDA H, MATSUZAWA A, IGAWA Y, YAMAZAKI Y, KAIDOH K, AKAHANE S, KOJIMA M, MIYATA H, AKAHANE M and NISHIZAWA O (2018) Functional Characterization of β-adrenoceptor Subtypes in the Canine and Rat Lower Urinary TractJournal of Urology, VOL. 170, NO. 2, (654-658), Online publication date: 1-Aug-2003.YAMANISHI T, CHAPPLE C, YASUDA K, YOSHIDA K and CHESS-WILLIAMS R (2018) Identification of β-Adrenoceptor Subtypes in Lower Urinary Tract of the Female PigJournal of Urology, VOL. 168, NO. 6, (2706-2710), Online publication date: 1-Dec-2002.Yamanishi T, Yasuda K, Sakakibara R, Hattori T, Ito H and Murakami S (2018) PELVIC FLOOR ELECTRICAL STIMULATION IN THE TREATMENT OF STRESS INCONTINENCE: AN INVESTIGATIONAL STUDY AND A PLACEBO CONTROLLED DOUBLE-BLIND TRIALJournal of Urology, VOL. 158, NO. 6, (2127-2131), Online publication date: 1-Dec-1997. Volume 151Issue 4April 1994Page: 1066-1069 Advertisement Copyright & Permissions© 1994 by The American Urological Association Education and Research, Inc.Keywordsmuscle contractionurethraterbutalineclenbuterolMetricsAuthor Information T. Yamanishi More articles by this author K. Yasuda More articles by this author M. Tojo More articles by this author T. Hattori More articles by this author R. Sakakibara More articles by this author J. Shimazaki More articles by this author Expand All Advertisement PDF DownloadLoading ..." @default.
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• W3718719 title "Effects of Beta₂-Stimulants on Contractility and Fatigue of Canine Urethral Sphincter" @default.
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