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 5 Mean, Minimum and Maximum Positive Predictive Value with Sensitivity > 80% and F1-Score of all 16 PWTT-parameters

Parameter	Mean	Min	Max	F1-score
PWTT raw c finger Q	0.69	0.66	0.73	0.806
PWTT raw c finger R	0.67	0.66	0.68	0.806
PWTT raw c ear Q	0.67	0.66	0.68	0.806
PWTT raw c ear R	0.66	0.64	0.68	0.806
PWTT raw non-c finger Q	0.68	0.66	0.70	0.806
PWTT raw non-c finger R	0.69	0.67	0.71	0.806
PWTT raw non-c ear Q	0.68	0.67	0.69	0.806
PWTT raw non-c ear R	0.67	0.66	0.69	0.810
∆PWTT c finger Q	0.69	0.68	0.71	0.817
∆PWTT c finger R	0.68	0.67	0.70	0.806
∆PWTT c ear Q	0.68	0.67	0.70	0.820
∆PWTT c ear R (best-PWTT)	0.69	0.67	0.73	0.806
∆PWTT non-c finger Q	0.71	0.67	0.75	0.814
∆PWTT non-c finger R	0.68	0.66	0.69	0.806
∆PWTT non-c ear Q	0.70	0.68	0.72	0.821
∆PWTT non-c ear R	0.70	0.66	0.74	0.813

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. n = 74

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