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.