Table 2.
Preoperative nocturnal breathing characteristics of examined patients
| All patients (n = 92) | No postoperative delirium (n = 48) | Postoperative delirium (n = 44) | P | |
|---|---|---|---|---|
| AHI; median (IQR [range]) | 18.3 (8.7-32.8 [2-65]) | 13.2 (7.1-22.4 [2–51]) | 27.7 (14.0-39.7 [2-65]) | 0.001 |
| AHI, n (%): | <0.01 | |||
| <5 | 9 (9.8) | 6 (12.5) | 3 (6.8) | |
| ≥5 | 83 (90.2) | 42 (87.5) | 41 (93.2) | |
| ≥15 | 54 (58.7) | 21 (43.8) | 33 (75) | |
| ≥30 | 29 (31.5) | 8 (16.7) | 21 (47.7) | |
| Mean oxygen saturation; mean ± SD | 92.3 ± 1.8 | 92.5 ± 1.9 | 92.1 ± 1.6 | 0.36 |
| Mean oxygen desaturation; mean ± SD | 91.7 ± 1.9 | 92.2 ± 1.8 | 91.0 ± 1.8 | <0.01 |
| Mean minimal oxygen saturation; mean ± SD | 77.9 ± 6.3 | 79.1 ± 5.9 | 76.3 ± 6.6 | 0.07 |
| Measured time (in%) spent with an oxygen saturation <90%; mean ± SD | 5.8 ± 11.8 | 4.1 ± 11.7 | 7.8 ± 11.8 | 0.17 |
(Mean oxygen saturation describes the overall mean oxygen saturation during the night. Mean oxygen desaturation is defined as the mean decrease in oxygen saturation during apnea/hypopnea. Mean minimal oxygen saturation describes the mean values of the lowest oxygen saturation measured during the recording time. IQR, interquartile range, data in cells mean ± SD, standard deviation). AHI, apnea-hypopnea index.