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Abstract
Previous studies have demonstrated that β-adrenergic agonists cause extension of ischaemic lesions in the myocardium. In the present study the effects of isoproterenol on adenine nucleotide metabolism were investigated in cat hearts with regional ischaemia following permanent coronary occlusion for 45 min. Adenine nucleotides and their metabolites were measured by high performance liquid chromatography and regional myocardial blood flow was measured by 15-μ radiolabeled microspheres in a total of 255 paired tissue samples. Compared with untreated control cats, ATP and the energy charge were more reduced in ischaemic myocardium of isoproterenol-treated cats. Increased amounts of the degradation products inosine and hypoxanthine/xanthine were also found in these regions. These results could be ascribed to increased cardiac performance caused by isoproterenol, which augments the imbalance between energy production and oxygen supply in ischaemic myocardium.