Table 3.

Multivariate analysis for duration of ICU stay

	Coefficient	p-value
Age (months old)	0.007	0.54
Gender (male)	−0.4	0.85
RACHS-1	2.5	0.049
Lowest temperature during CPB (°C)	−0.6	0.08
CPB time (min)	0.006	0.17
The use of epinephrine after weaning from CPB	15.1	<0.001
The duration between LacFIRST and LacLast (min)	−0.24	0.65
LacFIRST (mmol/L)	0.7	0.42
LAC⊿≦0 mmol/L	reference
LAC⊿ 0-1mmol/L (vs. LAC⊿≦0 mmol/L)	2.1	0.42
LAC⊿ 1-2mmol/L (vs. LAC⊿≦0 mmol/L)	0.8	0.81
LAC⊿ >2mmol/L (vs. LAC⊿≦0 mmol/L)	10.3	0.028

ICU: intensive care unit.

RACHS-1: Risk-Adjusted classification for Congenital Heart Surgery Version 1.

CPB: cardiopulmonary bypass.

Lac_FIRST: lactate level measured at the end of cardiopulmonary bypass.

Lac_LAST: last measurement of lactate level in the operating room.

LAC⊿:change of lactate level after cardiopulmonary bypass.