Table 1. Baseline Patient Characteristics (n = 167).
| Characteristic | Patients, No. (%) | Standardized difference | |
|---|---|---|---|
| Invasive (n = 84) | Conservative (n = 83) | ||
| Demographic data | |||
| Age, mean (SD), y | 86 (5) | 85 (5) | .218 |
| Sex | |||
| Female | 52 (62) | 36 (43) | .401 |
| Male | 32 (38) | 47 (57) | |
| Diabetes | 50 (60) | 43 (52) | .155 |
| Insulin treatment | 19 (23) | 19 (23) | .006 |
| Hypertension | 77 (92) | 76 (92) | .004 |
| Hypercholesterolemia | 63 (75) | 65 (78) | .078 |
| Current smoker | 3 (4) | 2 (2) | .230 |
| Peripheral artery disease | 9 (11) | 9 (11) | .004 |
| Chronic kidney disease | 39 (46) | 35 (42) | .085 |
| Dialysis | 3 (4) | 2 (2.4) | .068 |
| Prior myocardial infarction | 19 (23) | 32 (39) | .349 |
| Prior PCI | 19 (23) | 33 (40) | .374 |
| Prior CABG | 5 (6) | 11 (13) | .248 |
| Prior history of atrial fibrillation | 26 (31) | 19 (23) | .181 |
| Prior stroke | 13 (16) | 17 (21) | .203 |
| Prior admission for heart failure | 13 (16) | 16 (19) | .100 |
| Hemodynamic data | |||
| Blood pressure, mm Hg | |||
| Systolic | 139 (27) | 141 (23) | .060 |
| Diastolic | 69 (16) | 70 (12) | .105 |
| Heart rate, beats/min | 77 (15) | 79 (21) | .095 |
| Killip class | |||
| I | 67 (80) | 61 (74) | .005 |
| II | 11 (13) | 19 (23) | |
| III | 6 (7) | 3 (4) | |
| ECG | |||
| Normal ECG | 26 (31) | 27 (33) | .127 |
| ST-segment depression | 34 (41) | 25 (30) | .187 |
| T-wave inversion | 9 (11) | 16 (19) | .043 |
| Left bundle-branch block | 10 (12) | 10 (12) | .040 |
| Pacemaker | 5 (6) | 5 (6) | .003 |
| Blood test | |||
| Hemoglobin, mean (SD), g/dL | 12.4 (2) | 12.4 (2) | .008 |
| Creatinine, mean (SD), mg/dL | 1.4 (1) | 1.3 (1) | .056 |
| Geriatric conditions | |||
| Clinical Frailty Scale score | |||
| 4 | 23 (27) | 20 (24) | .073 |
| 5 | 32 (38) | 40 (48) | |
| 6 | 26 (31) | 22 (27) | |
| 7 | 3 (4) | 1 (1) | |
| Frail scale, mean (SD), points | 2.5 (1) | 2.5 (1) | .015 |
| Charlson index, mean (SD), points | 2.5 (2) | 3.0 (2) | .234 |
| Barthel index, mean (SD), points | 75 (23) | 75 (20) | .001 |
| Pfeiffer test, mean (SD), errors | 1.8 (2) | 2.0 (2) | .140 |
Abbreviations: CABG, coronary artery bypass graft; ECG, electrocardiogram; PCI, percutaneous coronary intervention.