The effect of prazosin, indoramin and phentolamine on sympathetic nerve activity

European Journal of Pharmacology
A G Ramage

Abstract

The failure of alpha 1-adrenoceptor antagonists, prazosin and indoramin, to cause a reflex tachycardia was investigated in the anaesthetised cat. Recordings were made of preganglionic sympathetic nerve activity from the third or fourth white ramus communicans, femoral arterial conductance, heart rate and blood pressure. A 1 h infusion of prazosin or indoramin caused falls in preganglionic sympathetic nerve activity, heart rate and blood pressure. Infusion of phentolamine differed, in that there was an increase in preganglionic sympathetic nerve activity and heart rate along with a fall in blood pressure. Indoramin differed from prazosin and phentolamine in that it only caused a small increase in femoral arterial conductance. It is suggested that the ability of prazosin and indoramin to cause a reduction in central thoracic sympathetic outflow may explain the failure of these drugs to cause a reflex tachycardia in man and experimental animals.

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Citations

Jul 31, 1985·European Journal of Pharmacology·A G Ramage
Feb 26, 1985·European Journal of Pharmacology·A G Ramage, A Tomlinson
Feb 11, 1986·European Journal of Pharmacology·A G Ramage
Dec 13, 1988·European Journal of Pharmacology·T ItoM C Koss
Mar 29, 1988·European Journal of Pharmacology·M Laubie, H Schmitt
Jul 3, 1990·European Journal of Pharmacology·M C KossT Ito
Mar 5, 1991·European Journal of Pharmacology·M C Koss
Feb 1, 1987·Journal of the American College of Cardiology·C V LeierD V Unverferth
Apr 1, 1991·British Journal of Pharmacology·A G Ramage
Feb 7, 2006·Autonomic Neuroscience : Basic & Clinical·Jiuan-Miaw LiaoTzer-Bin Lin
Apr 1, 1988·British Journal of Clinical Pharmacology·A H DeeringR G Shanks
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