Association of low mixed venous oxygen saturations during early ICU stay with increased 30-day and 1-year mortality after cardiac surgery: a single-center retrospective study

Table 4 Receiver operating characteristic curve analysis of SvO₂ for 30-day mortality

Group	SvO₂ < 60% at ICU admission, AUC (95%CI)	SvO₂ < 60% 4 h after ICU admission, AUC (95%CI)
All patients	0.71 (0.66–0.76)	0.64 (0.59–0.69)
Ascending aorta and aortic dissection	0.76 (0.66–0.87)	0.74 (0.62–0.86)
CABG	0.66 (0.59–0.74)	0.61 (0.53–0.68)
Valvular surgery	0.68 (0.59–0.78)	0.60 (0.50–0.69)
Combined procedures	0.79 (0.69–0.90)	0.72 (0.61–0.83)

AUC, area under curve; CABG, coronary artery bypass grafting; 95%CI, 95% confidence interval; ICU, intensive care unit; SvO₂, mixed venous oxygen saturation

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