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Abstract

Pharmacological analysis of beta adrenoceptor blockade-induced coronary blood flow redistribution in dogs using l-penbutolol.

A Berdeaux, P Duhazé and J F Giudicelli
Journal of Pharmacology and Experimental Therapeutics June 1982, 221 (3) 740-747;
A Berdeaux
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P Duhazé
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J F Giudicelli
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Abstract

The effects of l- and d-penbutolol on regional myocardial blood flow (assessed by means of tracer microspheres) and on ST-segment elevation in ischemic and nonischemic areas of the canine left ventricle have been investigated under different experimental conditions. l-Penbutolol reduced transmural coronary blood flow and induced its redistribution from the epicardium to the endocardium in both ischemic and nonischemic areas. This favorable effect was abolished under atrial pacing or after bilateral stellectomy or in the presence of phenoxybenzamine. d-Penbutolol did not induce coronary blood flow redistribution. These results indicate that the redistribution phenomenon occurs only if both a beta adrenoceptor blockade-induced bradycardia and a beta adrenoceptor blockade-induced reinforcement of alpha adrenoceptors-mediated coronary vasoconstrictor tone are simultaneously achieved l-Penbutolol alone or in the presence of phenoxybenzamine decreased ST-segment elevation in ischemic areas, but this effect was abolished by atrial pacing, confirming the major role of bradycardia in the reduction of ischemic injury.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 221, Issue 3
1 Jun 1982
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Abstract

Pharmacological analysis of beta adrenoceptor blockade-induced coronary blood flow redistribution in dogs using l-penbutolol.

A Berdeaux, P Duhazé and J F Giudicelli
Journal of Pharmacology and Experimental Therapeutics June 1, 1982, 221 (3) 740-747;

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Abstract

Pharmacological analysis of beta adrenoceptor blockade-induced coronary blood flow redistribution in dogs using l-penbutolol.

A Berdeaux, P Duhazé and J F Giudicelli
Journal of Pharmacology and Experimental Therapeutics June 1, 1982, 221 (3) 740-747;
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