Sleep study
thoracic and abdominal respiratory movements, snoring, SDB
In-hospital unattended full polysomnography (PSG) was performed at cardiology department before RDN and at 1-year follow-up. The recordings included the following traces: electroencephalogram, electrooculogram, electromyogram of chin muscles, electrocardiogram, oronasal airflow (via both nasal cannulas and thermistor), pulseoximeter, snoring, thoracic and abdominal respiratory movements, and body position. The baseline and follow-up recordings were scored manually by experienced specialists (LK, MB) according to the Scoring rules of the American Academy of Sleep Medicine version 2.5 [None of the patients with SDB used non-invasive ventilation (due to the lack of reimbursement of CPAP-therapy in Russia most of the patients with SDB denied therapy, two patients did not tolerate the device).