Table 3.

Correlation analysis of lactate kinetics, superior mesenteric artery flow, and hemodynamic parameters.

Variable	2-h lactate kinetics		6-h lactate kinetics		12-h lactate kinetics
	r	P	r	P	R	P
SMA-RI	−0.6074	<0.0001*	−0.5266	<0.0001*	0.1815	0.1416
SMA-PSV	0.0464	0.7091	0.1704	0.1681	0.2816	0.0210*
SMA-EDV	0.5829	<0.0001*	0.5490	<0.0001*	−0.0401	0.7473
Pv-aCO2	−0.2195	0.0743	−0.2242	0.0682	−0.2159	0.0793
ScvO2	0.1633	0.1868	0.1193	0.3362	0.1311	0.2902
PI	−0.1550	0.2103	−0.1100	0.3756	−0.0475	0.7028

^*P < 0.05; SMA-RI, resistance index of the superior mesenteric artery; SMA-PSV, peak systolic velocity of the superior mesenteric artery; SMA-EDV, end-diastolic velocity of the superior mesenteric artery; Pv-aCO₂, arterial and venous carbon dioxide partial pressure difference; ScvO₂, superior vena cava oxygen saturation; PI, Perfusion Index.