Definitions
The VT or PVC targeted during ablation was deemed as the “clinical” arrhythmia if it resembled the arrhythmia noted on preprocedural monitoring (ECG, ambulatory heart rhythm monitoring, ICD electrograms analysis). Procedural outcomes were defined as follows:
Procedural success was defined as no inducibility of VT or PVC following ablation
Procedural failure was characterized by continued presence of the clinical arrhythmia following ablation.
Postprocedural outcomes were defined as follows:
Clinical success was determined by no recurrence with the same/ fewer antiarrhythmic drugs (AAD) used in the case of VT and by 80% reduction in burden or improved symptoms with same/ less AAD use in the case of PVC 18.
Clinical failure was determined by the recurrence of arrhythmia (less than 80% burden reduction in the case of PVC) or recurrent symptoms attributable to the arrhythmia, ICD therapies, or the need for a repeat ablation procedure.