Protective effects of beta-adrenergic blockade in isolated ischemic hearts

European Journal of Pharmacology
L R BushB R Lucchesi

Abstract

The protective effects of the beta-adrenergic blocking drugs, propranolol and atenolol, were tested in a model of global ischemia and assessed electron microscopically. Cats isolated hearts were perfused retrogradely with arterial blood drawn from donor cats. After a period of equilibration, isolated hearts were rendered globally ischemic for 1 h and subsequently reperfused for another hour. Hearts were then flushed with physiological salt solution followed by perfusion-fixation with cacodylate-buffered glutaraldehyde, containing ionic lanthanum. Lanthanum was included as a probe of myocardial membrane integrity. Left ventricular subendocardial samples were processed and examined electron microscopically. Nontreated hearts, which underwent normothermic ischemia and reperfusion, displayed extensive ultrastructural damage. Nonischemic and donor cat control myocardial tissue appeared normal in all respects. Hearts that received either propranolol or atenolol maintained their ultrastructural integrity, resembling controls. Ionic lanthanum proved to be reliable as a marker of membrane integrity and permeability, as nontreated hearts displayed intracellular deposition of the marker, indicating that deteriorations of membrane integrit...Continue Reading

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Citations

Jan 22, 1982·European Journal of Pharmacology·E F SmithA M Lefer
Jun 24, 1986·European Journal of Pharmacology·N LavanchyA Rossi
Aug 2, 1988·European Journal of Pharmacology·I MiuraY Abiko
May 19, 1993·European Journal of Pharmacology·A N HoqueY Abiko
Jan 1, 1989·Free Radical Biology & Medicine·S L JewettP Hochstein
Jul 17, 1998·Free Radical Biology & Medicine·C Giulivi, E Cadenas

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