Effects of beta-adrenoceptor antagonists on cardiac function in ischemic-reperfused myocardium of the isolated working rabbit heart.

Abstract

The effects of beta-adrenoceptor antagonists (dl-nebivolol, atenolol and propranolol) and of 1-nebivolol on cardiodynamics and mitochondrial oxidative phosphorylation were studied in the isolated working rabbit heart subjected to normothermic global ischemia, followed, in some cases, by reperfusion. The hearts were pretreated with the different drugs (0.32 mg/l) 30 min before the start of ischemia, dl-Nebivolol and propranolol provided protection for both cardiodynamic and mitochondrial functions, as did l-nebivolol, which lacks beta-adrenoceptor blocking properties, while atenolol failed to protect mechanical activity and cardiac mitochondria against the effects of ischemia and post-ischemic reperfusion. Catecholamine depletion with reserpine did not have a beneficial effect on the recovery of cardiodynamic and mitochondrial function during post-ischemic reperfusion. It is concluded that the beneficial effects of beta-blockers on the ischemic and reperfused myocardium can not be explained by a specific beta-blocking action alone.

• Authors: H R Lu, G Vandeplassche, L Wouters, W Flameng, M Borgers
• Journal: European journal of pharmacology (Eur J Pharmacol) Vol. 184 Issue 1 Pg. 65-74 (Aug 02 1990) ISSN: 0014-2999 [Print] Netherlands
• PMID: 1976531 (Publication Type: Journal Article)

Chemical References

• Adrenergic beta-Antagonists
• Benzopyrans
• Ethanolamines
• Nebivolol
• Atenolol
• Reserpine
• Propranolol

Topics

• Adrenergic beta-Antagonists (pharmacology)
• Animals
• Atenolol (pharmacology)
• Benzopyrans (pharmacology)
• Coronary Circulation (drug effects)
• Coronary Disease (physiopathology)
• Ethanolamines (pharmacology)
• Female
• Heart (drug effects)
• Hemodynamics (drug effects)
• In Vitro Techniques
• Male
• Mitochondria, Heart (drug effects, metabolism)
• Myocardial Reperfusion Injury (physiopathology)
• Nebivolol
• Oxidative Phosphorylation (drug effects)
• Propranolol (pharmacology)
• Rabbits
• Reserpine (pharmacology)
• Stereoisomerism