Outcomes After Repeat Alcohol Septal Ablation in Patients With Obstructive Hypertrophic Cardiomyopathy

Area of Science:

• Cardiology
• Interventional Cardiology
• Cardiac Surgery

Background:

• Repeat alcohol septal ablation (ASA) may be necessary for persistent obstructive hypertrophic cardiomyopathy (oHCM).
• Outcomes following repeat ASA procedures are not extensively documented.

Purpose of the Study:

• To investigate the effectiveness and outcomes of repeat ASA in patients with obstructive hypertrophic cardiomyopathy.
• To identify factors influencing success after repeat ASA.

Main Methods:

• Retrospective analysis of 84 patients who underwent repeat ASA for oHCM.
• Stratification of residual left ventricular (LV) obstruction into proximal or distal.
• Primary outcome: absence of symptomatic residual LV obstruction at 12 months; secondary outcomes: mortality, arrhythmia, heart failure hospitalization, and need for further interventions.

Main Results:

• 80.7% of patients achieved the primary endpoint at 12 months post-repeat ASA.
• Success rates were higher for proximal obstruction (90.0%) compared to distal obstruction (72.1%).
• Proximal obstruction was associated with a higher likelihood of achieving the primary outcome (aOR: 4.06). Fatal arrhythmias and third interventions were more frequent with distal obstruction.

Conclusions:

• The location of residual obstruction (proximal vs. distal) appears to be a significant factor in long-term outcomes after repeat ASA.
• Further research is needed to fully elucidate the long-term implications of obstruction site on outcomes following repeat ASA.