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Table 2 Near-infrared spectroscopy-derived parameters in ICU survivors and non-survivors

From: Near-infrared spectroscopy for assessing tissue oxygenation and microvascular reactivity in critically ill patients: a prospective observational study

  ICU survivors (n = 71) ICU non-survivors (n = 18) P
First measurement
 StO2 (%) 78 (70–82) 81 (75–85) 0.176
 Downslope 1 (%/minute) −8.1 (−9.6 - −6.7) −7.9 (−10 - −6.2) 0.764
 Downslope 2 (%/minute) −7.7 (−10.5 - −5.6) −6.7 (−10.5 - −3.4) 0.200
 Delta-downslope (%/minute) 0.1 (−1.2 - 1.7) 2.1 (−0.5 - 3.6) 0.050
 Upslope (%/minute) 150 (114–206) 103 (44–224) 0.202
 AUC StO2 14.6 (9.2-26.8) 4.3 (0.5-16.6) 0.002
 Tissue haemoglobin index 10.9 (8.4-12.9) 10.9 (8.4-13.7) 0.612
Mean values
 StO2 (%) 80 (76–84) 79 (73–85) 0.567
 Downslope 1 (%/minute) −8.8 (−10.3 - −7.6) −8.7 (−10.5 - −7.9) 0.927
 Downslope 2 (%/minute) −9.0 (−10 - −7.2) −6.5 (−8.6 - −5.4) 0.010
 Delta-downslope (%/minute) 0.4 (−0.8 - 1.8) 2.8 (0.4-3.8) 0.004
 Upslope (%/minute) 185 (143–217) 141 (75–183) 0.016
 AUC StO2 14.5 (11.2-21.3) 7.9 (4.3-12.6) 0.001
 Tissue haemoglobin index 11.0 (9.1-12.8) 11.4 (9.5-13.7) 0.432
  1. Data are presented as median (1st-3rd quartile). StO 2 tissue O2 saturation, AUC StO 2 area under the curve of reactive hyperaemia