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 2 Comparison of tested circulatory system and oxygen metabolism parameters at consecutive measurement points.
| Measurement points | P | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BEG | PREOX | INDUCT | PP+T | AFT10 | AFT30 | AFT50 | AFT70 | ZERO | EXTUB | PACU | ||
| Median [IQR] | ||||||||||||
| MAP | 97 [87 to 106] | 90.5 [81 to 97] | 83 [73 to 97] | 82 [75 to 92] | 77 [71 to 83] | 76.5 [72 to 82] | 76 [72 to 80] | 74 [69 to 79] | 73 [66 to 80] | 91 [81 to 103] | 90 [79 to 99] | <0.0001 |
| SV | 81.5 [70 to 91] | 80.5 [70 to 93] | 58 [50 to 68] | 67 [61 to 76] | 70 [63 to 76] | 69 [63 to 75] | 68 [61 to 78] | 71 [63 to 80] | 77.5 [67 to 87] | 75.5 [67 to 85] | 77 [68 to 92] | <0.0001 |
| CO | 5.3 [4.2 to 6.6] | 5.3 [4.3 to 6.5] | 4.7 [3.9 to 5.7] | 4.4 [3.9 to 5] | 4.4 [3.9 to 5] | 4.3 [3.9 to 4.8] | 4.3 [3.9 to 4.9] | 4.6 [4.1 to 5.2] | 4.9 [4.3 to 6.7] | 5.9 [5.2 to 7.2] | 5.9 [5.1 to 7.2] | <0.0001 |
| CI | 2.6 [2.2 to 3.3] | 2.6 [2.2 to 3.2] | 2.3 [1.9 to 2.8] | 2.2 [1.9 to 2.5] | 2.2 [1.9 to 2.5] | 2.1 [1.9 to 2.4] | 2.1 [1.9 to 2.4] | 2.2 [2 to 2.5] | 2.4 [2.1 to 2.8] | 3 [2.6 to 3.5] | 2.9 [2.6 to 3.4] | <0.0001 |
| SpO | 96 [94 to 97] | 99 [99 to 100] | 99 [98 to 100] | 98 [97 to 99] | 98 [97 to 98] | 98 [97 to 98] | 98 [97 to 98] | 98 [97 to 98] | 98 [97 to 98.8] | 99 [98 to 100] | 97 [96 to 98] | <0.0001 |
| Pi | 2.6 [1,4 to 4.2] | 2.4 [1.3 to 3.8] | 2.7 [1.7 to 3.9] | 5.3 [4.3 to 6.5] | 5.3 [4.3 to 6.4] | 5.1 [4.1 to 6.2] | 5 [3.9 to 6] | 4.5 [3.4 to 5.4] | 3.1 [2.2 to 4] | 1.2 [0.8 to 1.8] | 1.2 [0.8 to 2.3] | <0.0001 |
| ORi | 0 [0 to 0] | 0.5 [0.3 to 0.8] | 0.4 [0.3 to 0.8] | 0.2 [0 to 0.2] | 0.2 [0 to 0.2] | 0.2 [0 to 0.3] | 0.2 [0 to 0.3] | 0.2 [0 to 0.3] | 0.3 [0.2 to 0.4] | 0.4 [0 to 0.6] | 0 [0 to 0] | <0.0001 |
| The data are presented as median and interquartile range (IQR). Comparisons between successive measurement points were performed using nonparametric analysis Friedman’s test with post hoc analysis. MAP – mean arterial pressure; SV – stroke volume; CO – cardiac output; CI – cardiac index; SpO – pulse oximetry; Pi – perfusion index; ORi – oxygen reserve index. 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. | ||||||||||||