Objective:To investigate the effect of early mechanical ventilation on mortality of patients with severe acute left ventricular failure.Methods:Ninety patients with acute left ventricular failure were divided into early mechanical ventilation group (n=45) and conventional mechanical ventilation group (n=45).Time of symptomatic relief,duration of mechanical ventilation and the mortality on 7 days were observed.Results:There was no difference in time of symptomatic relief between the two groups (4.7±1.7h vs 5...