Biochemical and Mechanical Effects of Phenylephrine on the Heart

Overview

Journal Eur J Pharmacol

Specialty Pharmacology

Date 1976 Apr 1

PMID 179825

Citations 8

Authors

S C Verma

J H McNeill

Affiliations

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Abstract

Injections of phenylephrine into isolated perfused guinea pig hearts increased cyclic AMP and phosphorylase a. Reserpine pretreatment or propranolol decreased or abolished the phenylephrine-induced biochemical changes without affecting the contractile response. Phentolamine, on the other hand, shifted the phenylephrine dose-response curve for contractility to the right without affecting the other parameters. The biochemical effects of phenylephrine are apparently due to the release of noradrenaline while the contractile effect is mediated directly through stimulation of alpha-adrenoceptors.

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