Arrhythmias & electrophysiologyCohort study
Extensive coronary venous system mapping for outflow tract ventricular arrhythmias: Utility of a dual over-the-wire microelectrode catheter technique
- prospective
Authors' conclusion
A dual OTW microelectrode catheter technique was feasible for extensive CVS mapping and was useful in defining the area of interest to perform anatomical approach or chemical ablation.
Study context
- Population
- Patients with outflow tract ventricular arrhythmia (OTVA) exhibiting either a right bundle branch block or a left bundle branch block pattern with V2 or V3 transitionpatients prospectively enrolled
- Participants
- 30 patients
Main finding
As reported in the abstract
Both catheters successfully placed in the intended vessels
Both catheters successfully placed in the intended vessels
28 patients (93%)
Observational data: associations, not effects.
Further findings
Site with earlier activation within the coronary venous system (CVS) clearly identified by aligning electrograms from both catheters, among the 26 patients whose earliest activation site was within the CVS
patients
- Patients whose earliest activation site was within the CVS
- 26
- Of those 26, earlier activation site clearly identified
- 12 (46%)
- Of those 26, activation timing equally early between the 2 catheters, requiring pace map findings
- 10 (39%)
- Of those 26, earliest activation recorded within the great cardiac vein where both catheters were positioned
- 4 (15%)
Targeted OTVA eliminated
patients
- Targeted OTVA eliminated
- 27 (90%)
- Including successful chemical ablation
- 4
Original publication
Extensive coronary venous system mapping for outflow tract ventricular arrhythmias: Utility of a dual over-the-wire microelectrode catheter technique. Heart Rhythm. Published 1 April 2026. doi:10.1016/j.hrthm.2026.03.1951
Summarised from the published abstract; every number is checked against it