Table 1. PATIENT CHARACTERISTICS, presented as N (%) or MEAN ± SD.
| Variable | Total | Postoperative Delirium | P | |
|---|---|---|---|---|
| Yes (N = 23) | No (N = 80) | |||
| Female | 73 (71%) | 15 (65%) | 58 (73%) | 0.60 |
| Age (years) | 82 ± 7 | 84±8 | 81±7 | 0.10 |
| BMI (kg/m2) | 23.9 ± 4.6 | 23.8±4.3 | 23.9±4.8 | 0.92 |
| MMSE | 25 ± 5 | 22 ± 5 | 26 ± 5 | 0.01* |
| Preoperative dementia diagnosis | 26 (25%) | 11 (48%) | 15 (19%) | 0.01** |
| Charlson co-morbidity index | 5 ± 3 | 6±3 | 5±3 | 0.09 |
| Number of prescribedMedications preoperatively | 4 ± 3 | 4 ± 3 | 4 ± 2 | 0.40 |
| Preoperative hypertension diagnosis | 88 (85%) | 22 (96%) | 66 (83%) | 0.18 |
| Baseline SBP (mm Hg) | 134 ± 17 | 136±18 | 133±17 | 0.59 |
| Baseline DBP (mm Hg) | 70 ± 11 | 74±14 | 69±10 | 0.12 |
| Baseline MAP (mm Hg) | 94 ± 15 | 98±17 | 93±14 | 0.20 |
| Baseline HR | 78 ± 21 | 81 ± 12 | 77 ± 23 | 0.20 |
| Days to surgery | 2 ± 2 | 2 ± 2 | 2 ± 2 | 0.88 |
| Average BIS value during surgery | 68 ± 22 | 59 ± 22 | 71 ± 21 | 0.02* |
| Length of surgery (minutes) | 85 ± 37 | 74 ± 33 | 88 ± 38 | 0.08 |
| RBC transfusion (units) | 1.0 ± 1.1 | 1.4 ± 1.2 | 0.8 ± 1.0 | 0.05* |
| Length of stay (days) | 7 ± 4 | 8 ± 6 | 6 ± 3 | 0.14 |
*P<0.05 by t-test;
**P<0.05 by chi-square