Table 4.

Association between VIS at the end of surgery and PMV.

Variable	Multivariate regression
	Model 1			Model 2
	OR	95% CI	P-value	OR	95% CI	P-value
UA (µmol/L)	1.006	1.001~1.012	0.028	1.006	1.001~1.012	0.018
CPB time (min)	1.014	1.002~1.026	0.017	1.018	1.006-1.030	0.004
VIS at the end of surgery	1.301	1.091~1.551	0.003	9.067	2.961~27.762	< 0.001

A forward stepwise multivariate logistic regression was used to evaluate the associated factors

CI=confidence interval; CPB=cardiopulmonary bypass; OR=odds ratio; PMV=prolonged mechanical ventilation; UA=uric acid; VIS=vasoactive-inotropic score