The effects of α1A adrenoceptor antagonists on the urethral perfusion pressure of female rat

Jae Hyun Bae, Suck Ho Kang, Phil Bum Jung, Jeong Gu Lee

Research output: Contribution to journalArticle

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Abstract

Purpose: This study was performed to identify the effects of the α1A adrenoceptor antagonist on the urethral perfusion pressure (UPP), and also to assess its therapeutic potentials for female bladder outlet obstruction (BOO). Materials and methods: A cannula was placed in the femoral artery for drug administration and systemic blood pressure monitoring in each female rat. The UPP and vesical pressure (Pves) were monitored using a triple-lumen catheter. Tamsulosin (group I), doxazosin (group II) and phentolamin (group III) were injected into female rats via the femoral cannula. Tamsulosin was also injected to male rats (group IV) for comparison with Group I. Results: After administration of tamsulosin in group I, the frequency was significantly decreased and the duration of minimal urethral relaxation with high frequency oscillations (Dhfo) was significantly prolonged. None of the parameters were significantly different compared with groups II and III, with the exception of the mean arterial blood pressure (MAP). The changes of MAP after tamsulosin were significantly lower than those after doxazosin and phentolamin. In the male rats (group IV), prior to the administration of tamsulosin, the UPP and Pves curves were similar to those of the female rats, but the maximal Pves was significantly higher than in group I. After the administration of tamsulosin to group IV, the prolongation of the frequency and Dhfo were significant. Conclusions: In the female rat urethra, the α1A adrenergic receptor may be a functional subtype. The α 1A adrenoceptor antagonist was found to prolong the Dhfo and decrease the frequency of involuntary bladder contraction. It might be possible that the α1A adrenoceptor antagonist improves not only the obstructive symptoms, but the bladder irritative symptoms also, by prolonging the Dhfo and frequency of an involuntary bladder contraction.

Original languageEnglish
Pages (from-to)842-848
Number of pages7
JournalKorean Journal of Urology
Volume46
Issue number8
Publication statusPublished - 2005 Aug 1

Fingerprint

tamsulosin
Adrenergic Receptors
Perfusion
Pressure
Arterial Pressure
Urinary Bladder
Doxazosin
Urinary Bladder Neck Obstruction
Urethra
Femoral Artery
Thigh
Catheters

Keywords

  • Adrenergic alpha-antagonists
  • Perfusion
  • Tamsulosin
  • Urethra

ASJC Scopus subject areas

  • Urology

Cite this

The effects of α1A adrenoceptor antagonists on the urethral perfusion pressure of female rat. / Bae, Jae Hyun; Kang, Suck Ho; Jung, Phil Bum; Lee, Jeong Gu.

In: Korean Journal of Urology, Vol. 46, No. 8, 01.08.2005, p. 842-848.

Research output: Contribution to journalArticle

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abstract = "Purpose: This study was performed to identify the effects of the α1A adrenoceptor antagonist on the urethral perfusion pressure (UPP), and also to assess its therapeutic potentials for female bladder outlet obstruction (BOO). Materials and methods: A cannula was placed in the femoral artery for drug administration and systemic blood pressure monitoring in each female rat. The UPP and vesical pressure (Pves) were monitored using a triple-lumen catheter. Tamsulosin (group I), doxazosin (group II) and phentolamin (group III) were injected into female rats via the femoral cannula. Tamsulosin was also injected to male rats (group IV) for comparison with Group I. Results: After administration of tamsulosin in group I, the frequency was significantly decreased and the duration of minimal urethral relaxation with high frequency oscillations (Dhfo) was significantly prolonged. None of the parameters were significantly different compared with groups II and III, with the exception of the mean arterial blood pressure (MAP). The changes of MAP after tamsulosin were significantly lower than those after doxazosin and phentolamin. In the male rats (group IV), prior to the administration of tamsulosin, the UPP and Pves curves were similar to those of the female rats, but the maximal Pves was significantly higher than in group I. After the administration of tamsulosin to group IV, the prolongation of the frequency and Dhfo were significant. Conclusions: In the female rat urethra, the α1A adrenergic receptor may be a functional subtype. The α 1A adrenoceptor antagonist was found to prolong the Dhfo and decrease the frequency of involuntary bladder contraction. It might be possible that the α1A adrenoceptor antagonist improves not only the obstructive symptoms, but the bladder irritative symptoms also, by prolonging the Dhfo and frequency of an involuntary bladder contraction.",
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