Study	Comparison	NYHA class*	Outcome
V-HeFT I	Hydralazine plus isosorbide dinitrate v placebo	II, III	Improved mortality with active treatment
V-HeFT II	Hydralazine plus isosorbide dinitrate v enalapril	II, III	Enalapril superior to hydralazine plus isosorbide dinitrate for survival