Table III.
Selected procedural characteristics among entire sample and according to anesthetic group expressed as count (%) or mean ± SD
| Variable | Overall n = 5,462 |
General anesthesia n = 4,768 |
Regional anesthesia n = 694 |
P value* |
|---|---|---|---|---|
| Surgeon specialty | ||||
| Vascular surgeon | 5,268 (96.5) | 4,598 (96.4) | 670 (96.5) | 0.8866 |
| Other | 194 (3.6) | 170 (3.6) | 24 (3.5) | |
| Resident involved | 3,651 (66.9) | 3,243 (68.1) | 408 (58.9) | <0.0001 |
| Patients requiring transfusion (%) | 1,092 (20.0) | 1,001 (21.0) | 91 (13.1) | <0.0001 |
| Units transfused (among those >0) | 2.0 ± 1.2 | 2.0 ± 1.2 | 2.0 ± 1.1 | 0.7365 |
| Patients requiring >4 units transfused (%) | 46 (0.8) | 45 (0.9) | 1 (0.1) | 0.0312 |
| Operative time (min) | 237.0 ± 101.9 | 240.3 ± 103.2 | 214.6 ± 89.6 | <0.0001 |
| Total work RVUs | 32.4 ± 12.5 | 32.4 ± 12.5 | 32.0 ± 11.9 | 0.4622 |
| Infrapopliteal bypass | 2,787 (51.0) | 2,448 (51.3) | 339 (48.9) | 0.2193 |
| Vein bypass | 2,249 (41.2) | 1,963 (41.2) | 286 (41.2) | 0.9840 |
| Single vein bypass | 2,146 (39.3) | 1,862 (39.1) | 284 (40.9) | 0.3459 |
| Composite vein | 103 (1.9) | 101 (2.1) | 2 (0.3) | 0.0009 |
| Any prosthetic | 538 (9.9) | 485 (10.2) | 53 (7.6) | 0.0363 |
| Prosthetic only | 489 (9.0) | 440 (9.2) | 49 (7.1) | 0.0617 |
| Prosthetic and vein | 49 (0.9) | 45 (0.9) | 4 (0.6) | 0.3375 |
| Popliteal bypass | 2,675 (49.0) | 2,320 (48.7) | 355 (51.2) | 0.2193 |
| Vein bypass | 1,563 (28.6) | 1,341 (28.1) | 222 (32.0) | 0.0354 |
| Single vein bypass | 1,544 (28.3) | 1,322 (27.7) | 222 (32.0) | 0.0198 |
| Composite vein | 19 (0.4) | 19 (0.4) | 0 (0) | 0.1586a |
| Any prosthetic | 1,112 (20.4) | 979 (20.5) | 133 (19.2) | 0.4029 |
| Prosthetic only | 1,080 (19.8) | 953 (20.0) | 127 (18.3) | 0.2970 |
| Prosthetic and vein | 32 (0.6) | 26 (0.6) | 6 (0.9) | 0.3032a |
| Use of prosthetic graft | 1,645 (30.1) | 1,464 (30.7) | 181 (26.1) | 0.0131 |
RVU, relative value unit.
a
Fisher exact test used in place of χ2 test owing to low expected cell counts.
*
P values for tests of differences between general and regional anesthesia from χ2 test or Fisher exact test for categorical variables or from t test for continuous variables.