Abstract:
OBJECTIVE:To investigate the pharmacological effects of ethanol and its metabolite acetaldehyde on isolated rat bladder muscle, and thus assess the potential influence of ethanol ingestion on the risk of urinary retention in patients with benign prostatic hyperplasia. MATERIALS AND METHODS:Isometric tension changes of isolated rat bladder muscle strips were recorded in an organ bath using a pressure transducer. The acute or prolonged effects of ethanol (1-4%) or acetaldehyde (0.01, 0.1 or 1 mmol/L) were assessed on resting tension, electrical field stimulation (EFS), and bethanechol- (0.5 mmol/L), ATP- (2 mmol/L) or KCl- (127 mmol/L) induced contraction. To determine the mechanism of acetaldehyde-induced stimulation, an antihistamine, diphenhydramine was used after bethanechol stimulation. RESULTS:At the concentrations used, ethanol and acetaldehyde did not change the pH of the bathing medium. The resting tension of the muscle was not changed by ethanol, and acetaldehyde caused only a small increase in baseline tone at 1 mmol/L. Incubation with ethanol or acetaldehyde significantly suppressed contractility induced by EFS, bethanechol, ATP or KCl at each concentration (P<0.05). Contractions induced by all drugs were not changed significantly by the acute application of ethanol and the acute application of acetaldehyde did not affect contractions induced by ATP or KCl. However, EFS- or bethanechol-induced contractions were significantly enhanced (P<0. 05). The acetaldehyde-induced effects were completely blocked by the H1 antagonist, diphenhydramine (10 micromol/L). CONCLUSIONS:Ethanol did not affect resting tension but acetaldehyde and ethanol suppressed bladder muscle contractions. However, direct acetaldehyde-stimulation may release histamine and enhance contractility. This suggests that chronic alcoholism rather than acute intoxication is more likely to provoke urinary retention.
journal_name
BJU Intjournal_title
BJU internationalauthors
Kim HJ,Moon H,Sohng I,Lee HW,Lee G,Lee JGdoi
10.1046/j.1464-410x.1999.00968.xkeywords:
subject
Has Abstractpub_date
1999-04-01 00:00:00pages
686-92issue
6eissn
1464-4096issn
1464-410Xjournal_volume
83pub_type
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