Table 4.
Perioperative variables in relation to onset of postoperative delirium in patients with critical limb ischemia having surgery
| No delirium, n=63 (%) | Delirium, n=29 (%) | P-value | |
|---|---|---|---|
| ASA score ≥3 | 43 (68) | 26 (90) | 0.028 |
| Duration of anesthesia, median (IQR) | 142 (27–211) | 52 (26–100) | 0.035b |
| Type of anesthesia | |||
| General anesthesia | 56 (89) | 28 (96) | |
| Regional anesthesia | 7 (11) | 1 (4) | 0.226 |
| Operation type | |||
| Minor amputation | 16 (25) | 9 (31) | 0.572 |
| Major amputation | 7 (11) | 11 (38) | 0.003 |
| Bypassc | 32 (51) | 7 (24) | 0.016 |
| Femoral endarterectomy | 8 (13) | 2 (7) | 0.714a |
| Hb and transfusion | |||
| Preoperative anemiad | 35/59 (60) | 22/27 (81) | 0.044 |
| Preoperative Hb, median (IQR) | 7.7 (6.4–8.0) | 6.8 (6.3–7.4) | 0.075b |
| Postoperative anemiad | 31/32 (97) | 20/22 (91) | 0.560a |
| Postoperative Hb, median (IQR) | 6.45 (5.7–6.9) | 6.2 (5.7–6.9) | 0.832b |
| Packed cells transfusion | 18 (29) | 5 (17) | 0.244 |
| ≥3 Packed cells transfused | 9 (14) | 2 (7) | 0.492a |
Notes: Data are presented as n and (%), unless otherwise specified. P-value is calculated with chi-squared test.
a
Fisher’s exact test.
b
Mann–Whitney U-test.
c
Femoropopliteal, femorocrural, iliofemoral, and aortofemoral bypass.
d
Anemia is defined as a Hb <7.6 mmol/L for women and <8.2 mmol/L for men.23
Abbreviations: ASA, American Society of Anesthesiologists; IQR, interquartile range; Hb, hemoglobulin in mmol/L.