Baseline clinical characteristics
| Number of patients | 1606 |
| Age (years) | 44.4±15 |
| Male | 1030 (64%) |
| NYHA III/IV | 139 (9%) |
| Amiodarone | 217 (14%) |
| Previous alcohol septal ablation | 4 (0.2%) |
| Previous septal myectomy | 16 (1%) |
| Atrial fibrillation/flutter* | 164 (10%) |
| Left atrial diameter (mm) | 44±8 |
| LVOTG≥30 mm Hg | 475 (30%) |
| Maximal wall thickness (mm) | 20±6 |
*Paroxysmal/persistent/permanent.
LVOTG, left ventricular outflow tract gradient; NYHA, New York Heart Association functional class.