Central Venous-to-Arterial CO₂ Gap Is a Useful Parameter in Monitoring Hypovolemia-Caused Altered Oxygen Balance: Animal Study

Table 3

Complementation of ScvO₂ with CO₂ gap.

	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)
ScvO2 ≤ 73%	78	83	91	63
CO2 gap > 6 mm Hg	71	72	85	52
ScvO2 + CO2 gap (≤73%) (>6 mm Hg)	58	100	100	72

ScvO₂: central venous oxygen saturation; CO₂ gap: venous-to-arterial carbon dioxide difference; PPV: positive redictive value; NPV: negative predictive value.