Catheter Ablation for Ventricular Arrhythmias in Hypertrophic Cardiomyopathy

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Implantable cardioverter-defibrillators (ICDs) are primary for preventing sudden cardiac death in high-risk hypertrophic cardiomyopathy (HCM) patients.
• Catheter ablation is an alternative for drug-refractory ventricular tachycardia (VT) in HCM patients with devices.

Purpose of the Study:

• To review the role and outcomes of catheter ablation for VT in HCM patients.
• To identify challenges and potential improvements for VT ablation in HCM.

Main Methods:

• Literature review focusing on catheter ablation outcomes in HCM.
• Analysis of challenges including substrate characteristics and disease progression.
• Emphasis on patient selection using cardiac MRI and technique optimization.

Main Results:

• Limited data exist on catheter ablation outcomes in HCM compared to other nonischemic substrates.
• Challenges include deep intramural/epicardial substrates, suboptimal energy delivery, and disease progression leading to recurrence.
• Cardiac MRI scar localization and optimized ablation techniques may improve outcomes.

Conclusions:

• Catheter ablation is a viable option for recurrent VT in HCM patients refractory to medical therapy and device implantation.
• Addressing specific challenges in HCM is crucial for successful ablation.
• Improved patient selection and technique optimization are key to enhancing ablation efficacy and reducing recurrence.