Anthropometric data, New York Heart Association(NYHA) classes, left ventricular ejection fraction (LVEF) and causes of cardiac failure in the patients with obstructive sleep apnoea (OSA), Cheyne–Stokes respiration (CSR) and without sleep-disordered breathing (SDB)
| OSA | CSR | No SDB | |
| Patients n | 88 | 57 | 58 |
| Males | 67 (76) | 47 (82) | 38 (66)* |
| Hospitalised | 69 (78) | 49 (86) | 48 (83) |
| Age yrs | 64.7±1.1 | 67.2±1.2 | 64.2±1.2 |
| Body mass index kg·m−2 | 29.0±0.5* | 26.7±0.6 | 26.5±0.6 |
| NYHA II | 50 (57) | 32 (56) | 30 (52) |
| NYHA III | 38 (43) | 25 (44) | 28 (48) |
| LVEF % | 28.6±0.9 | 26.8±1.0 | 28.4±1.0 |
| Main cause of CHF | |||
| Coronary artery disease | 51 (58) | 33 (58) | 31 (53) |
| Dilated cardiomyopathy | 25 (28) | 17 (30) | 19 (33) |
| Hypertension | 12 (14) | 7 (12) | 8 (14) |
| Atrial fibrillation | 19 (22) | 25 (44)* | 13 (22) |
| PCO2 mmHg | 40.6±0.8 | 36.8±0.8** | 41.3±0.9 |
Data are presented as n (%) or mean±sem, unless otherwise stated. CHF: congestive heart failure; PCO2: carbon dioxide tension. *: p<0.05 and **: p<0.01 in comparison with the other two groups. 1mmHg = 0.133 kPa.