Retrograde Coronary Venous Ethanol Infusion for Ablation of Refractory Ventricular Tachycardia.

Background: Radiofrequency ablation (RFA) of ventricular tachycardia (VT) can fail because of inaccessibility to the VT substrate. Transarterial coronary ethanol ablation can be effective but entails arterial instrumentation risk. We hypothesized that retrograde coronary venous ethanol ablation can be an alternative bail-out approach to failed VT RFA.

Strategies for phrenic nerve preservation during ablation of inappropriate sinus tachycardia.

Background: Radiofrequency (RF) ablation can alleviate drug-refractory inappropriate sinus tachycardia (IST). However, phrenic nerve (PN) injury and other complications limit its use.

Objective: The purpose of this study was to characterize the maneuvers used to avoid PN injury and the long-term clinical outcomes.