HEMODYNAMIC AND CARDIAC EFFECTS OF SPIRAPRILAT IN NORMAL AND SODIUM-DEPLETED CONSCIOUS DOGS

Summary— The cardiac and hemodynamic effects of 3 doses (0.1, 0.3 and 1 mg/kg, iv) of spiraprilat, the diacid active metabolite of the new angiotensin I converting enzyme inhibitor spirapril, have been investigated and compared to those of saline in chronically implanted conscious dogs at rest. Under a normal sodium diet, spiraprilat, 1 mg/kg, induced significant (at least P<0.05) decreases in mean arterial pressure (MAP, −11%), total peripheral resistance (TPR, −21%), left ventricular end diastolic pressure (LVEDP, −15%) and increases in heart rate (HR, + 12%) and cardiac output (CO, + 16%) whereas dP/dtmax remained unchanged. Spiraprilat‐induced tachycardia was not modified by propranolol pre‐treatment but was abolished by previous administration of the propranolol‐N‐methylatropine combination. Spiraprilat, 0.1 mg/kg, did not affect any parameter, but spiraprilat, 0.3 mg/kg, showed intermediate effects. Finally, sodium depletion strongly potentiated spiraprilat effects on MAP, TPR, LVEDP, HR and CO. We conclude that: a), in conscious dogs under normal sodium diet, spiraprilat reduces TPR and MAP through peripheral vasodilating properties; b), spiraprilat‐induced tachycardia is mainly related to parasympathetic tone withdrawal, possibly in relation with high and low pressure baroreceptors deactivation; and c), sodium depletion considerably potentiates spiraprilat cardiac and hemodynamic effects. 1990 Société Française de Pharmacologie et de Thérapeutique