| Changes induced by volume expansion (Group 1) | Changes induced by introduction/increase in norepinephrine (Group 2) |
---|---|---|
CIpc versus CItd | Â | Â |
   Bland-Altman analysis for the changes in absolute value | Bias, -0.20 ± 0.63 L/min/m2 | Bias, -0.05 ± 0.74 L/min/m2 |
   Linear regression for the changes in percentage | r = 0.72 (P < 0.05) | r = 0.78 (P < 0.05) |
   Ability of CIpc to detect an increase in CItd ≥ 15% | Cut-off, CIpc increase ≥ 12% | Cut-off, CIpc increase ≥ 15% |
 | Specificity, 74 (49 to 91)% | Specificity, 93 (68 to 99)% |
 | Specificity, 95 (76 to 99)% | Specificity, 88 (69 to 97)% |
 | Area under the ROC curve, 0.878 (0.736 to 0.960) | Area under the ROC curve, 0.924 (0.795 to 0.983) |
CIpw versus CItd | Â | Â |
   Bland-Altman analysis for the changes in absolute value | Bias, -0.23 ± 0.95 L/min/m2 | Bias, -0.01 ± 1.75 L/min/m2 |
   Linear regression for the changes in percentage | r = 0.33 (P < 0.05) | r = -0.03 (P = 0.65) |
   Ability of CIpw to detect an increase in CItd ≥ 15% | Cut-off, CIpw increase ≥8% | Cut-off, CIpw increase ≥34% |
 | Sensitivity, 56 (33 to 80)% | Sensitivity, 27 (8 to 55)% |
 | Specificity, 71 (48 to 89)% | Specificity, 96 (80 to 99)% |
 | Area under the ROC curve, 0.564 (0.398 to 0.720)a | Area under the ROC curve, 0.541 (0.377 to 0.700)a |