Non-invasive assessment of Pulse Wave Transit Time (PWTT) is a poor predictor for intraoperative fluid responsiveness: a prospective observational trial (best-PWTT study)

Table 4 ROC models and Wilcoxon-test of all 16 PWTT-parameters

ROC model	AUC	SD	95% CI	P-value
PWTT raw c finger Q	0.61	0.07	0.48—0.75	0.131
PWTT raw c finger R	0.61	0.07	0.48—0.74	0.095
PWTT raw c ear Q	0.57	0.07	0.43—0.70	0.439
PWTT raw c ear R	0.53	0.07	0.39—0.67	0.598
PWTT raw non-c finger Q	0.54	0.07	0.39—0.68	0.790
PWTT raw non-c finger R	0.52	0.07	0.37—0.66	0.925
PWTT raw non-c ear Q	0.50	0.07	0.36—0.65	0.727
PWTT raw non-c ear R	0.55	0.07	0.41—0.69	0.490
∆PWTT c finger Q	0.63	0.07	0.50—0.76	0.091
∆PWTT c finger R	0.61	0.07	0.48—0.74	0.174
∆PWTT c ear Q	0.64	0.06	0.51—0.77	0.091
∆PWTT c ear R (best-PWTT)	0.66	0.06	0.54—0.79	0.029
∆PWTT non-c finger Q	0.59	0.07	0.44—0.74	0.237
∆PWTT non-c finger R	0.57	0.07	0.43—0.71	0.394
∆PWTT non-c ear Q	0.57	0.07	0.42—0.71	0.623
∆PWTT non-c ear R	0.61	0.07	0.47—0.75	0.280

raw measurements in [ms] vs. ∆ = respiratory variation in [%]; c = corrected measurements according to Bazett’s formula vs. non-c = uncorrected measurements; Q vs. R = start of PWTT-measurements with Q- or R-wave in ECG; finger vs. ear = pulse oximetry probe location. P-value of Wilcoxon-test to discriminate fluid responders from non-responders (= increase in stroke volume ≥ 10%). n = 74

ISSN: 1471-2253