Improve the accuracy of OTVA localization and broaden clinical applications
Tanner et al.[18] reported that stepwise endocardial and epicardial mapping using up to six anatomic approaches could lead to successful RFCA. In all patients, activation mapping was performed from the RVOT, including the pulmonary cusp or trunk. If ablation was not achieved, epicardial mapping within the GCV-AIV was performed. If ablation still failed, mapping of the ASC and left ventricular endocardium below the ASC was performed via the femoral artery. Owing to its benefit–risk ratio, the subxiphoid approach was avoided.
The use of this simple ECG measurement algorithm can improve the accuracy of OTVA localization and has the advantage of procedural simplification. Moreover, our algorithm avoided complicated calculations and confusing diagnostic results acquired from different ECG parameters, keeping the diagnostic algorithm simple, and contributes to generalized clinical application.