Somnoscreen plus psg device

A SOMNOscreen Plus PSG device (SOMNOmedics GMBH Germany) was applied for overnight polysomnography, at the Institute of Pulmonology Törökbálint, under medical supervision. The examination results were adapted according to the American Academy of Sleep Medicine. Apnoea is determined as a reduction of 90% or more airflow through the oronasal thermistor for 10 s or more and hypopnoea as a reduction of 30% or more airflow, accompanied by a desaturation or arousal of 3% or more oxyhaemoglobin. The severity of OSA can be classified according to the apnoea-hypopnoea index (AHI) [21 (link)]. Due to the relatively low number of participants, they were classified into control (AHI < 5), mild OSA (5 ≤ AHI < 15), and moderately severe–severe OSA (AHI ≥ 15) groups.

Overnight polysomnography (PSG) was performed under medical control at the Törökbálint Institute of Pulmonology using a SOMNOscreen Plus PSG device (SOMNOmedics GmbH, Germany). The definition of apnoea and hypopnea was obtained from the recommendation of the American Academy of Sleep Medicine. Apnoea is present when 90% or more airflow reduction is detected for at least 10 s. Hypopnea is a reduction of 30% or more airflow for at least 10 s, accompanied by oxyhaemoglobin desaturation (3% or more) or arousal [16 (link)]. The severity of OSA can be calculated using the apnoea-hypopnea index (AHI), which demonstrates the apnoea and hypopnea events per hour [16 (link)]. Given the relatively low number of subjects examined, our patients were grouped as normal (AHI < 5), mild (5 ≤ AHI < 15) and moderately severe-severe (AHI ≥ 15).