Table 2.

Binary logistic regression analysis for ICU mortality

Variables	Odds ratio (95% CI)	p value
ICU MORTALITY (abnormal MFI)
APACHE II score	1.204 (1.089–1.331)	< 0.001
MFI < 2.6	4.594 (1.340–15.754)	0.015
ICU MORTALITY (abnormal MFI + tachycardia)
APACHE II score	1.191 (1.077–1.316)	0.001
MFI < 2.6 + tachycardia	10.732 (1.685–68.354)	0.012

In the upper model baseline, MFI abnormality was the independent variable. Model AUC 0.836 [0.747–0.904], Nagelkerke R² 0.359, Hosmer and Lemeshow χ² 4.733, p = 0.822. In the lower model, the presence of abnormal MFI plus tachycardia was the independent variable. Model AUC 0.836 [0.747–0.903], Nagelkerke R² 0.374, Hosmer and Lemeshow χ² 2.670, p = 0.914

APACHE acute physiologic and chronic health evaluation II, calculated in the first 24 h from ICU admission; ICU Intensive Care Unit; MFI Microvascular Flow Index. Abnormal MFI is defined as MFI < 2.6 for small vessels (diameter < 20 μm). Tachycardia is defined as a heart rate ≥ 90 bpm