Specificity of ScvO2 in diagnosing low cardiac output comparing to PiCCO Low cardiac ouput ScvO2 <70% ScvO2 ≥70% Total CI < 3 62 21 83 CI ≥3 31 246 277 Total 93 267 360 Using ScvO2, it was able to detect 74.7% of cases with low cardiac output and excluded 88.8% of patients who did not suffer cardiac output reduction.