Table 2

Preoperative comorbidities stratified by the RCRI

RCRI 0
N=79 941 (%)
RCRI 1
N=36 848 (%)
RCRI 2
N=13 086 (%)
RCRI 3
N=3971 (%)
RCRI ≥4
N=1069 (%)
P value
Hypertension20 394 (25.5%)18 925 (51.4%)8542 (65.3%)2985 (75.2%)910 (85.1%)<0.001
Arrhythmia7831 (9.8%)9243 (25.1%)5326 (40.7%)1991 (50.1%)607 (56.8%)<0.001
Myocardial infarction0 (0.0%)2352 (6.4%)3032 (23.2%)1849 (46.6%)830 (77.6%)<0.001
Congestive heart failure0 (0.0%)9153 (24.8%)7575 (57.9%)3339 (84.1%)1030 (96.4%)<0.001
Peripheral vascular disease1984 (2.5%)1933 (5.2%)1198 (9.2%)552 (13.9%)223 (20.9%)<0.001
Cerebrovascular disease0 (0.0%)13 475 (36.6%)6749 (51.6%)2335 (58.8%)823 (77.0%)<0.001
Dementia15 118 (18.9%)8349 (22.7%)2811 (21.5%)818 (20.6%)208 (19.5%)<0.001
Chronic obstructive pulmonary disease7084 (8.9%)5020 (13.6%)2363 (18.1%)850 (21.4%)260 (24.3%)<0.001
Connective tissue disease3303 (4.1%)1983 (5.4%)808 (6.2%)324 (8.2%)69 (6.5%)<0.001
Peptic ulcer disease1875 (2.3%)1392 (3.8%)698 (5.3%)278 (7.0%)85 (8.0%)<0.001
Liver disease640 (0.8%)473 (1.3%)170 (1.3%)66 (1.7%)21 (2.0%)<0.001
Diabetes0 (0.0%)10 244 (27.8%)6170 (47.1%)2525 (63.6%)917 (85.8%)<0.001
Hemiplegia337 (0.4%)1474 (4.0%)747 (5.7%)254 (6.4%)99 (9.3%)<0.001
Chronic kidney disease0 (0.0%)1624 (4.4%)2646 (20.2%)1865 (47.0%)810 (75.8%)<0.001
Local tumor7452 (9.3%)4497 (12.2%)1853 (14.2%)585 (14.7%)173 (16.2%)<0.001
Metastatic carcinoma1659 (2.1%)877 (2.4%)312 (2.4%)91 (2.3%)23 (2.2%)0.009
  • RCRI, Revised Cardiac Risk Index.