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Isoprenaline-induced changes in regional myocardial perfusion in the pathogenesis of myocardial necrosis
British Journal of Experimental Pathology
|December 1, 1976
Abstract:
Isoprenaline in a single dose induces impairment in perfusion of the subendocardial myocardium of the rat left ventricle. This defect in perfusion persists for up to 150 min and corresponds in distribution to the myocardial necrosis produced by similar doses of isoprenaline. It is mediated by the beta-receptors as it is prevented by beta-blockade with propranolol. It is considered that isoprenaline-induced myocardial necrosis represents myocardial infarction.
Insights
A single dose of isoprenaline impairs blood flow to the rat heart
Area of Science:
- Cardiovascular physiology
- Pharmacology
- Cardiac pathology
Background:
- Isoprenaline is a non-selective beta-adrenergic agonist.
- Myocardial necrosis is a known side effect of high-dose isoprenaline administration.
Purpose of the Study:
- To investigate the effect of a single isoprenaline dose on myocardial perfusion.
- To determine the temporal profile and mechanism of isoprenaline-induced perfusion defects.
Main Methods:
- Administration of a single dose of isoprenaline to rats.
- Assessment of subendocardial myocardial perfusion using imaging techniques.
- Evaluation of the effect of propranolol (a beta-blocker) on perfusion.
Main Results:
- Isoprenaline induced a persistent defect in subendocardial perfusion in the rat left ventricle.
- This perfusion defect lasted up to 150 minutes post-administration.
- The perfusion defect distribution mirrored the pattern of myocardial necrosis.
- Beta-blockade with propranolol prevented the isoprenaline-induced perfusion impairment.
Conclusions:
- Isoprenaline-induced myocardial necrosis is likely a form of myocardial infarction.
- The beta-adrenergic system mediates isoprenaline's detrimental effects on myocardial perfusion.