Results
The study included 309 patients (59 years [38-73], 49% female) with
ILR implantation for unexplained syncope. Median battery longevity was
42 [40-45] months. 99.5% of ILR reached prespecified battery
longevity. The time to end-of-life varied by up to 33 months among the
same ILR models. Overall arrhythmogenic diagnostic yield counted 27%
(73% sick sinus syndrome, 20% atrioventricular block and 7%
ventricular tachycardia). Median time to diagnosis was 10 [2-25]
months, with the latest event at 43 months. The cumulative diagnostic
yield for arrhythmogenic event was 15.7%, 22.9%, 34.9% , 54.2%,
72.3% and 100% at 1, 2, 6, 12, 24 and 48 months respectively. In
univariate analysis, 1st degree AV-block and prolonged
HV time on EP study were predictors of diagnosis, while QRS duration
abnormality borderline missed significance.