NONSELECTIVE BETA-BLOCKERS IN PATIENTS WITH CIRRHOSIS: "THE THERAPEUTIC WINDOW".

For over 30 years, nonselective beta-blockers (NSBB) have been successfully used for preventing variceal bleeding in patients with cirrhosis and portal hypertension. Nevertheless, recent studies suggest that NSBB may be effective only within a particular "therapeutic window" in patients with advanced liver disease. Outside of this window, in early stages of cirrhosis and in very advanced cirrhosis, NSBB may be ineffective and even potentially harmful.