“ Enalapril provides significant haemodynamic, symptomatic and clinical improvement when added to maintenance therapy with digitalis and diuretics in patients with congestive heart failure [NYHA (New York Heart Association) classes II to IV].”
“More significantly, a clinical study demonstrated that enalapril reduces mortality when added to established therapy in patients with severe congestive heart failure (NYHA class IV) refractory to digitalis , diuretics and other vasodilators.”