Systemic haemodynamics, renal and platelet function during chronic propranolol administration in patients with...

Chronic propranolol administration is followed by some haemodynamic alterations, which may impair renal function. It has also been suggested that it may reduce platelet production of proaggregatory thromboxane (TX) A2. We therefore evaluated cardiac index (CI), systemic vascular resistance (SVR), creatinine clearance, daily sodium excretion under controlled sodium intake, platelet aggregation and platelet TXA2 production during whole blood clotting in eight patients with cirrhosis, portal hypertension and no ascites, before and after 3 months of propranolol administration. Liver function was also assessed by evaluating the galactose elimination capacity (GEC) and galactose clearance (Cgal). The expected, significant reduction of CI and increase of SVR was observed. Creatinine clearance and sodium balance were unchanged throughout the study. Furthermore, the renal prostaglandin system, as reflected by urinary prostaglandin E2 and TXB2 excretion, was also unaffected by the drug. No modification of platelet aggregation, platelet TXA2 production during whole blood clotting, GEC and Cgal was observed. We conclude that chronic propranolol administration is followed by alterations of CI and SVR, but it does not impair renal function and platelet aggregation in patients with cirrhosis, portal hypertension and no ascites. The maintenance of renal function during beta-adrenergic blockade is not due to an increased renal production of vasodilating prostaglandins.