Table I.
Category | Preoperative variable | N (%) | |
---|---|---|---|
Cardiac | Angina within 1 month | Yes | 381 (2.2) |
Cardiac surgery prior | Yes | 4279 (24.2) | |
Congestive heart failure | Yes | 120 (0.7) | |
Myocardial infarction (within 6 months) | Yes | 218 (1.2) | |
Percutaneous coronary intervention prior | Yes | 3481 (19.7) | |
Circulatory | Bleeding disorder | Yes | 2497 (14.1) |
Previous peripheral arterial revascularization or amputation | Yes | 1720 (9.7) | |
Rest pain in lower extremity | Yes | 121 (0.7) | |
General | Age, years | <60 | 1896 (10.7) |
60-69 | 5465 (30.9) | ||
70-79 | 6808 (38.5) | ||
≥80 | 3523 (19.9) | ||
American Society of Anesthesiologists class | 1 | 439 (2.5) | |
2 | 4641 (26.3) | ||
3 | 11,238 (63.6) | ||
4 | 1362 (7.7) | ||
5 | 3 (0.02) | ||
Body mass index, median (interquartile range), kg/m2 | 28.5 (25.4-32.3) | ||
Corticosteroid use (chronic) | Yes | 319 (1.8) | |
Diabetes mellitus | On insulin | 2844 (16.1) | |
On medication | 1934 (10.9) | ||
Functional status | Dependent | 290 (1.6) | |
Hypertension | Yes | 15,144 (85.6) | |
Race | American Indian | 44 (0.3) | |
Asian/Pacific Islander | 176 (1.0) | ||
Black | 580 (3.3) | ||
Hispanic | 506 (2.9) | ||
Unknown | 1037 (5.9) | ||
White | 15,162 (86.6) | ||
Sex | Male | 10,217 (57.9) | |
Female | 7437 (42.1) | ||
Systemic inflammatory response syndrome | Yes | 78 (0.5) | |
Transition (admitted from:) | Home | 17,520 (99.0) | |
Acute care | 89 (0.5) | ||
VA acute care | 1 (0.01) | ||
Chronic care | 55 (0.3) | ||
VA chronic care | 0 | ||
Others | 27 (0.2) | ||
Weight loss >10% within 6 months | Yes | 71 (0.4) | |
Laboratory | Albumin | Abnormal | 914 (5.2) |
Alkaline phosphatase | Abnormal | 544 (3.1) | |
Blood urea nitrogen | Abnormal | 7310 (41.3) | |
Creatinine | Abnormal | 2197 (12.4) | |
Hematocrit | Abnormal | 3379 (19.1) | |
Platelets | Abnormal | 2360 (13.3) | |
Prothrombin time | Abnormal | 3311 (18.7) | |
Partial thromboplastin time | Abnormal | 1081 (6.1) | |
Serum glutamic oxaloacetic transaminase | Abnormal | 922 (5.2) | |
Sodium | Abnormal | 1950 (11.0) | |
White blood cell count | Abnormal | 1700 (9.6) | |
Renal | Dialysis (preoperative) | Yes | 143 (0.8) |
Respiratory | COPD | Yes | 1755 (9.9) |
Dyspnea | At rest or moderate exertion | 3310 (18.7) | |
Pneumonia (preoperative) | Yes | 14 (0.1) | |
Social | Alcohol intake within last 2 weeks | Yes | 746 (4.2) |
Smoking within past year | Yes | 4588 (25.9) | |
Therapy | Anesthesia | General | 14,649 (82.8) |
Regional | 3040 (17.2) |
COPD, Chronic obstructive pulmonary disease; VA, Veterans Affairs.