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Extended Cardiac Monitoring in Patients With Severe Sleep Apnea and No History of Atrial Fibrillation (The Reveal XT-SA Study).
American Journal of Cardiology 2018 December 2
Atrial fibrillation (AF) is a risk factor for ischemic stroke and reported to be associated with severe obstructive sleep apnea (OSA). The aim of this study was to determine the occurrence of newly detected AF in patients with severe OSA and no previous history of AF. Prospective observational study included patients with severe OSA (Apnea-Hypopnea Index [AHI] ≥ 30) and no history of AF. Primary outcome was detection of AF lasting ≥10 seconds. Patients were subjected to 2 24-hour Holter monitors, and if no AF was detected, implanted with a Medtronic Reveal XT implantable loop recorder. Follow-up was done every 6 months for a total of 3years. Implantable loop recorder was explanted if the primary outcome was detected (AF) or the battery was exhausted. Of the 31 patients enrolled, 6 withdrew participation in the study before implantation. Mean age was 57 ± 10years, mean body mass index was 35 ± 6; 52% male patients. Hypertension 56% and coronary artery disease 24%. Mean AHI was 55 ± 18. AF was detected in 5 patients (20%). AF mean duration was 4.8hours (range 20 seconds to 15.3 hours). Mean time to diagnosis was 11 ± 7 months. Male gender was predictive for AF detection (p = 0.04). Continuous positive airway pressure therapy was used by 96% of patients with 68% total adherence. Mean follow-up was 27 months. In conclusion, extended cardiac monitoring of patients with severe OSA may facilitate the identification of newly detected AF.
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