Table 4.

Myocardial Injury and Dysfunction Sub-Study—Left Ventricular Performance and Cardiac Troponin I

	Temperature Group
Variables	Hypothermia (n = 33)	Normothermia (n = 29)	P Value
Left Ventricular Ejection Fraction
Preoperativea	0.69 (0.64, 0.75) (n = 30)	0.64 (0.62, 0.73) (n = 24)	0.16
Postoperativeb	0.72 (0.63, 0.75) (n = 28)	0.69 (0.62, 0.73) (n = 22)
Postoperative vs. Preoperative Change	-0.01 (-0.06, 0.07) (n = 26)	0.01 (-0.03, 0.06) (n = 20)	0.51
Regional Wall Motion Score
Preoperativec	1.00 (1.00, 1.00) (n = 32)	1.00 (1.00, 1.00) (n = 29)	0.62
Postoperative	1.00 (1.00, 1.00) (n = 33)	1.00 (1.00, 1.00) (n = 29)
Postoperative vs. Preoperative Changed	0.00 (0.00, 0.00) (n = 32)	0.00 (0.00, 0.00) (n = 29)	0.61
Cardiac Troponin I (mcg/L)
Preoperativee	0.03 (0.03, 0.04) (n = 26)	0.03 (0.03, 0.03) (n = 25)	0.43
Postoperativef	0.03 (0.03, 0.04) (n = 26)	0.03 (0.03, 0.04) (n = 24)
Postoperative vs. Preoperative Changeg	0.00 (-0.01, 0.00) (n = 26)	0.01 (-0.03, 0.06) (n = 24)	0.038

Values are reported as median, (25^th and 75^th quartile values).

All P-values are calculated using Wilcoxon Rank Sum test.

^aAny preoperative left ventricular ejection fraction < 50%: Hypothermia = 1/30, Normothermia = 0/24.

^bAny postoperative left ventricular ejection fraction < 50%: Hypothermia = 0/28, Normothermia = 1/22.

^cAny preoperative wall motion score > 1.00: Hypothermia = 2/32, Normothermia = 1/29.

^dAny postoperative increase (worsening) of wall motion score: Hypothermia = 2/32, Normothermia = 2/29.

^eAny preoperative troponin > 1 mcg/L: Hypothermia = 1/26, Normothermia = 0/25.

^fAny postoperative troponin > 1 mcg/L: Hypothermia = 0/26, Normothermia = 2/24.

^gAny postoperative troponin increase: Hypothermia = 3/26, Normothermia = 5/24.