21 May 2026 : Clinical Research
Monitoring Oxygen Metabolism Using the Oxygen Reserve Index in Patients Undergoing Robotic Prostatectomy: A Prospective Observational Study
Małgorzata M. Barud
ABCDEF 1,2*, Bartłomiej P. Turek BEF 2, Dorota Siwicka ACDEFG 1,2
DOI: 10.12659/MSM.952156
Med Sci Monit 2026; 32:e952156
Table 4 Correlation between BMI and selected oxygen metabolism variables.
| Variable | n | BMI (univariable) | BMI (multivariable) | ||
|---|---|---|---|---|---|
| Rho | p | Rho | P | ||
| G1 PaO (BEG) | 96 | −0.213 | 0.0371 | −0.206 | 0.0469 |
| G2 PaO (PP+T) | 96 | −0.443 | 0.0000 | −0.409 | <0.0001 |
| G3 PaO (ZERO) | 96 | −0.426 | 0.0000 | −0.425 | <0.0001 |
| ORi BEG | 82 | −0.208 | 0.0610 | −0.139 | 0.2175 |
| ORi PREOX | 82 | −0.294 | 0.0073 | −0.265 | 0.0177 |
| ORi INDUCT | 82 | −0.019 | 0.8649 | −0.080 | 0.4782 |
| ORi PP+T | 90 | −0.368 | 0.0004 | −0.398 | 0.0001 |
| ORi AFT10 | 91 | −0.333 | 0.0012 | −0.346 | 0.0009 |
| ORi AFT30 | 92 | −0.352 | 0.0006 | −0.302 | 0.0037 |
| ORi AFT50 | 91 | −0.313 | 0.0025 | −0.266 | 0.0117 |
| ORi AFT70 | 86 | −0.322 | 0.0025 | −0.348 | 0.0012 |
| ORi ZERO | 89 | −0.113 | 0.2938 | −0.066 | 0.5433 |
| ORi EXTUB | 69 | 0.054 | 0.6609 | 0.001 | 0.9918 |
| ORi PACU | 70 | −0.214 | 0.0748 | −0.135 | 0.2720 |
| SpO BEG | 96 | −0.309 | 0.0022 | −0.232 | 0.0245 |
| SpO PREOX | 95 | −0.196 | 0.0566 | −0.266 | 0.0100 |
| SpO INDUCT | 96 | −0.204 | 0.0462 | −0.307 | 0.0026 |
| SpO PP+T | 96 | −0.308 | 0.0023 | −0.312 | 0.0022 |
| SpO AFT10 | 96 | −0.272 | 0.0073 | −0.245 | 0.0172 |
| SpO AFT30 | 96 | −0.272 | 0.0073 | −0.339 | 0.0008 |
| SpO AFT50 | 95 | −0.303 | 0.0029 | −0.348 | 0.0006 |
| SpO AFT70 | 89 | −0.205 | 0.0539 | −0.268 | 0.0120 |
| SpO ZERO | 96 | −0.214 | 0.0366 | −0.316 | 0.0019 |
| SpO EXTUB | 96 | −0.189 | 0.0648 | −0.2642 | 0.0101 |
| SpO PACU | 96 | −0.378 | 0.0001 | −0.375 | 0.0002 |
| The relationships between BMI and the analyzed parameters were assessed using Spearman’s rank correlation coefficient (univariable analysis). In addition, a multivariable analysis was performed to assess correlations between BMI and selected parameters after taking into account covariates. The table shows the correlation coefficients (Rho) for univariable analysis and partial correlation coefficients (r partial) with their corresponding levels of statistical significance. G1 PaO – partial pressure of oxygen in arterial blood before the induction of anesthesia; G2 PaO – partial pressure of oxygen in arterial blood after the patient was placed in the Trendelenburg position; G3 PaO – partial pressure of oxygen in arterial blood after returning the patient to initial position; ORi – oxygen reserve index; SpO – pulse oximetry. Time points: BEG – before induction of anesthesia; PREOX – after pre-oxygenation with 100% oxygen; INDUCT – after induction of anesthesia; PP+T – after placing the patient in the Trendelenburg position and establishing pneumoperitoneum; AFT10 – 10 minutes after PP+T; AFT30 – after 30 minutes; AFT50 – after 50 minutes; AFT70 – after 70 minutes; ZERO – after returning the patient to the initial position; EXTUB – after extubation; PACU – before transferring the patient to the post-anesthesia care unit. | |||||