Use of a QDOT MICRO catheter to identify a premature ventricular contraction origin in the right ventricular anterior papillary muscle in a repaired truncus arteriosus

The ventricular papillary muscles (VPMs) can be a source of premature ventricular contractions (PVCs). Catheter ablation of VPM PVCs is challenging because of the anatomical complexity, such as the apical structures in proximity to the ventricular walls. The QDOT MICRO catheter (Biosense Webster, Diamond Bar, CA, USA) has microelectrodes embedded along the circumference of its distal tip and can provide information on which side of its tip myocardial activation is earlier. This repaired truncus arteriosus case demonstrates the usefulness of the microelectrode recording in identifying a PVC origin in a rightVPMapex close to the right ventricular anterior wall.

Automated summary

The ventricular papillary muscles (VPMs) can cause premature ventricular contractions (PVCs). Catheter ablation of VPM PVCs is challenging due to anatomical complexity, such as apical structures near the ventricular walls. The QDOT MICRO catheter with microelectrodes can determine the myocardial activation timing and identify the origin of PVCs near the right ventricular anterior wall, as demonstrated in this repaired truncus arteriosus case.