Perioperative non-invasive versus semi-invasive cardiac index monitoring in patients with bariatric surgery – a prospective observational study

Table 3 Summary of correlation and Bland-Altman analyses according to each pre- and intraoperative measurement time point

Measurement time point	Data pairs CI_Nexfin vs. CI_FloTrac N	Correlation coeffcient r_s	P value	Bias, l/min/m²	SD of bias, l/min/m²	LOA, l/min/m²	PE, %
1 Baseline	51	0.56	< 0.001	−0.08	0.90	− 1.85-1.68	54.42
2 Anesthesia induction + ATP	52	0.56	< 0.001	0.08	0.60	− 1.09-1.26	55.63
3 Baseline Anesthesia	53	0.38	0.01	−0.05	1.02	−2.06-1.96	89.64
4 Anesthesia + PLR	52	0.74	< 0.001	−0.20	0.50	−1.18-0.79	47.85
5 Anesthesia + Fluid bolus	53	0.82	< 0.001	−0.33	0.42	−1.17-0.50	46.34
6 Baseline PP	54	0.66	< 0.001	−0.29	0.72	−1.69-1.12	68.64
7 PP + ATP	52	0.64	< 0.001	−0.21	0.49	−1.16-0.75	48.88
8 PP + ATP + Fluid bolus	54	0.77	< 0.001	−0.18	0.42	−1.00-0.63	35.95
9 End PP	53	0.65	< 0.001	−0.34	0.47	−1.26-0.57	36.54
10 End Anesthesia + ATP	50	0.64	< 0.001	−0.03	0.78	−1.55-1.49	48.14

ATP Anti-Trendelenburg posture, LOA Limits of agreement, PE Percentage error, PLR Passive leg raising, PP Pneumoperitoneum, SD Standard deviation

ISSN: 1471-2253