Characteristics of patients undergoing coronary angiography (CAG) with heart failure with reduced ejection fraction (HFrEF) and univariable analysis of obstructive coronary artery disease (OCAD) versus non-obstructive coronary artery disease (NOCAD) (n=260)
| Parameters | Overall | OCAD n=119 (45.8%) | NOCAD n=141 (54.2%) | OR (95% CI) | P value |
| Age (years) | 57.1±10.5 | 58.8±10.1 | 55.7±10.7 | 1.03 (1.00 to 1.05) | 0.02 |
| Age more than 50 years | 187 (71.9) | 92 (77.3) | 95 (67.4) | 1.6 (0.95 to 2.9) | 0.08 |
| Females | 63 (24.2) | 27 (22.7) | 36 (25.5) | 1.2 (0.66 to 2.1) | 0.5 |
| Prior heart failure | 53 (20.4) | 21 (17.6) | 32 (22.7) | 0.73 (0.39 to 1.3) | 0.16 |
| Smoker | 40 (15.4) | 14 (11.8) | 26 (18.4) | 0.59 (0.29 to 1.2) | 0.16 |
| Dyslipidaemia | 58 (22.3) | 27 (22.7) | 31 (22.0) | 1.0 (0.58 to 1.9) | 0.7 |
| Hypertension | 167 (64.2) | 70 (58.1) | 97 (58.1) | 0.63 (0.38 to 1.0) | 0.07 |
| Family history of premature CAD | 43 (16.5) | 29 (24.4) | 14 (9.9) | 2.9 (1.5 to 5.8) | 0.002 |
| Diabetes mellitus | 145 (55.8) | 74 (62.2) | 71 (50.2) | 1.6 (0.98 to 2.6) | 0.12 |
| History of chest pain | 68 (26.2) | 48 (40.3) | 20 (14.2) | 4.1 (2.2 to 7.4) | <0.0001 |
| Initial creatinine (mg/dL) | 1.17±0.52 | 1.20±0.63 | 1.14±0.42 | 1.2 (0.76 to 2.0) | 0.3 |
| Non-invasive stress test | 53 (20.4) | 36 (30.3) | 17 (12.1) | 3.2 (1.7 to 6.0) | 0.0003 |
CAD, coronary artery disease.