Current results of both procedures
| Myectomy | ASA | p Value | |
|---|---|---|---|
| Efficacy/effectiveness | |||
| Symptomatic relief | 95% | 92% | 0.43 |
| Gradient at follow-up (mm Hg) | 12.2±3.8 | 19.7±6.4 | <0.001 |
| Reintervention | 1.6% | 7.7% | <0.001 |
| Complications | |||
| Periprocedural mortality | 1.1% | 1.3% | 0.75 |
| Periprocedural VT/VF | 0.2% | 2.2% | 0.055 |
| In-hospital stay (days) | 9 (4–6) | 5 (4–6) | <0.001 |
| PM implantation | 4.0% | 10% | <0.001 |
| Survival | |||
| Overall survival | 1.4%/year | 1.5%/year | 0.78 |
| SCD+ICD shock | 0.49%/year | 0.41%/year | 0.47 |
| SCD−ICD shock* | 0.47%/year | 0.34%/year | 0.16 |
ASA, alcohol septal ablation; ICD, internal cardioverter defibrillator; PM, pacemaker; SCD, sudden cardiac death; VT/VF, ventricular tachycardia/ventricular fibrillation