Background: The left coronary cusp is an uncommon but well-known site for the ablation of idiopathic ventricular tachycardia (VT). Proximity to the left coronary ostium makes ablation of this arrhythmia challenging. Different power settings have been described by various operators. Our objective was to describe the outcomes with low power ablation.
Methods: Once mapping confirmed origin from the left coronary cusp, ablation was performed if the best site was situated at least 5 mm from the left coronary ostium. Ablation was started at 15 W and, if successful, was stopped after 30 s. When required, higher powers were used up to 30 W.
Results: Ten patients with VT or premature ventricular beats mapped to the left coronary cusp were included in the study. No ablation was performed in one patient because of proximity to the left coronary ostium. Successful ablation was performed in eight of the other nine patients with a mean power of 18.1 ± 5.3 W and duration of 42.2 ± 13.5 s. There were no complications. All the eight patients remained free of recurrence at 16.8 ± 16.5 months of follow-up.
Conclusions: VT can be ablated from the left coronary cusp close to the left coronary ostium. Ablation with low power is effective in achieving immediate success which is also durable with time while avoiding complications.
Keywords: Ablation; Aortic cusp; Idiopathic ventricular tachycardia; Left coronary cusp; Ventricular tachycardia.
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