Note: OR = odds ratio.
Supplementary material
Ventricular Arrhythmias adjudication process:
- first stage: objective criteria were applied to exclude
non-physiological signals and interferences, ventricular and atrial
cycle length comparison; atrio-ventricular coupling; stability of
ventricular rhythm tachyarrhythmia;
- second stage: each of two independent electrophysiologists give
classification on visual analysis. When discordant, a third expert
electrophysiologist was asked to classify the event, blinded to
previous decision, and the event was labelled as per majority vote.
Adjudicated VA were classified in one of the groups:
- VT if detected in any VT zone, according to individualized
programming, lasting more than 4 beats;
- VF if detected in the VF zone according to individualized programming;
- VA requiring ATP, if any ATP was delivered during the episode of VT or
VF;
- VA requiring shock therapy, if any shock was delivered during the
episode of VT or VF.
Episodes were excluded if they were categorized after revision as
supraventricular tachycardia or if they were thought to be secondary to
device misinterpretation or malfunctioning.