Key result
Right atrial appendage leads in Jewel ICDs linked to ~81% more far-field R-wave oversensing.
Why the study?
What is the incidence and what are the predisposing factors for far-field R wave oversensing in patients with a dual chamber ICD?
Population
48 patients who had the Medtronic Jewel 7250 dual chamber ICD
Comparison
Medtronic Jewel 7250 dual chamber ICD vs Other atrial lead locations
Design
Cohort
Follow-up
total follow-up of 797 months
Authors
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May prompt closer monitoring for inappropriate therapies; leaves open whether non-appendage lead sites reduce oversensing events.
Observational (n=48)
What is the incidence and what are the predisposing factors for far-field R wave oversensing in patients with a dual chamber ICD?
Absolute Event Rate: 25.9% vs 14.3%
p-value: p=<0.05
Far-field R wave oversensing is common in dual chamber ICDs, particularly with right atrial appendage lead placement, and can lead to inappropriate therapies including proarrhythmia.
Weretka et al. (2001) conducted an observational in Patients with a Medtronic Jewel 7250 dual chamber ICD (n=48). Right atrial appendage lead position vs. Other lead locations was evaluated on Far-field R wave oversensing (FFRWOS) (p=<0.05). Far-field R wave oversensing occurred in 21.3% of patients with the Jewel 7250 ICD and was more frequent with right atrial appendage leads than other locations (25.9% vs 14.3%; P<0.05).
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