Which intervention is aimed at eliminating the arrhythmogenic substrate in scar-related ventricular tachycardia?

• A. Catheter ablation
• B. Pacemaker
• C. Anticoagulation
• D. Lifestyle modification

Answer: (A)

The key idea is that scar-related ventricular tachycardia is driven by reentrant circuits that run through scar tissue. Scar from a prior heart attack or cardiomyopathy creates slow-conducting channels and critical pathways—the arrhythmogenic substrate—that allow a VT circuit to persist. Catheter ablation directly targets and eliminates this substrate by delivering energy through a catheter to create linear lesions or isolate the critical isthmus, interrupting the conduction pathways that sustain the reentrant loop. By mapping the circuit and then ablating the key channels, you prevent the VT from being initiated or sustained, reducing episodes and recurrence.

This differs from other options because a pacemaker mainly provides pacing support and does not remove the scar-based substrate; anticoagulation reduces stroke risk and isn't aimed at arrhythmia circuits; lifestyle changes don’t modify the scar substrate itself. In some cases, drugs may suppress VT temporarily, but they don’t eliminate the underlying substrate the way targeted ablation does.