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À̵¿È¯/Dong Hwan Lee ¼­È«Áø/±èÁØö/À±À翵/ȲÅ°ï/Hong Jin Suh/Jae Young Yoon/Joon Chul Kim/Tae Kon Hwang

Abstract

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Purpose: Ethanol is known to induce bladder neck contraction so that it may cause
acute urinary retention in patients with benign prostatic hyperplasia. We investigated
whether ethanol has o-sympathomimetic effects in the bladder neck.
Materials and Methods: 36 New zealand rabbits weighing from 2.5-3.0kg were used for
this experiment. The rabbits were sacrificed by air embolism and the urinary bladder
was immediately removed. The urinary bladder was dissected free from surrounding
tissues and divided into the bladder body and neck in oxygenated Tyrode's solution.
The bladder neck muscle strips were taken and the contractile responses to electrical
field stimulation(2, 4, 8, 16 and 32Hz) and phenylephrine(1 mM), adenosine
triphosphate(ATP, 100mM) and KCI(100mM)were measured.
Results : The frequency-response curve by electrical stimulation in ethanol pretreated
Tyrode's solution were attenuated, but tonic contractions were not affected. ATP
induced contraction was also attenuated. Ethanol showed relaxing effects in the
contractile responses elicited by phenylephrine and KCI.
Conclusions : From these studies, ethanol is shown to exert direct inhibitory action on
bladder neck contraction presumably by lowering the calcium sensitivity of the smooth
muscle in the rabbit.

Å°¿öµå

Smooth muscle contractility; Bladder neck; Ethanol; Rabbit;

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