The effects of a new alpha- and beta-adrenoceptor antagonist (AH5158) upon the general and coronary haemodynamics of intact dogs.

AH5158, a salicylamide derivative, said to be a blocker of alpha- and beta-adrenoceptors, has been studied in intact anaesthetized dogs. At a dose of 2.5 mg/kg intravenously, the drug increased cardiac output and caused a late fall in mean systemic and pulmonary arterial pressure. Coronary sinus flow increased, as did cardiac oxygen extraction. External cardiac efficiency decreased. Blood glucose and non-esterified fatty acid values increased, but cardiac extraction of these did not change.