Isoprenaline-induced myocardial necrosis in dogs.

Subcutaneous injections of isoprenaline sulphate in dogs (1-3 mg/kg) resulted in myocardial injury. Good correlation was observed between abnormal ECG recordings, serum enzyme concentrations and myocardial lesions in the acute phase of injury. However, in cases where less extensive myocardial injury was produced due to lower doses of isoprenaline or in cases of the reparative phase of the isoprenaline-induced myocardial injury, serum enzymes were not useful indicators of the change. Similary, ECG recordings taken peripherally also did not show alteration in the reparative phase of the injury in spite of extensive myocardial lesions.