Moreover , patients in urapidil group showed lower N-terminal pro-B-type natriuretic peptide levels but higher ejection fraction ( t = 2.206 , P < 0.05 ) , cardiac index ( t = 3.13 , P < 0.05 ) and left end-diastolic volume ( t = -3.104 , P < 0.05 ) compared to NG group .