Risk with inotropes was more pronounced among those with cardiac index 1.8 L min ( -1 ) m ( -2 ) ( n = 114 ; HR 4.65 , 95 % CI 1.98-10 .9 ; P < .001 ) vs < 1.8 L min ( -1 ) m ( -2 ) ( n = 82 ; HR 1.48 , 95 % CI 0.61-3 .58 ; P = .39 ) .