Polysomnographic and Clinical Features of Positional and Non-positional Sleep Apnea Syndrome in Turkish Adult Population: Experience from a Single Institution

AKSOY S., Cil O. C.

Sleep and Vigilance, 2023 (Scopus) identifier

  • Publication Type: Article / Article
  • Publication Date: 2023
  • Doi Number: 10.1007/s41782-023-00250-7
  • Journal Name: Sleep and Vigilance
  • Journal Indexes: Scopus
  • Keywords: Obstructive sleep apnea, Positional apnea, Sleep disorders, Sleep position
  • Çanakkale Onsekiz Mart University Affiliated: Yes


Purpose: The purpose of the study is to determine prevalence of positional obstructive sleep apnea (POSA) and non-POSA among obstructive sleep apnea syndrome (OSAS) cases. Additionally, it aims to compare the sociodemographic and polysomnographic characteristics in the city of Canakkale, located in the northwest of Turkey. Method: We included 263 patients diagnosed with OSAS by polysomnography (PSG) between January 2021 and November 2022. OSAS was defined as AHI ≥ 5. The severity of OSAS was assessed as normal (AHI < 5); mild (AHI 5–15); moderate (AHI 16–30); and severe (AHI > 30). Sociodemographic characteristics such as gender, weight, and height, along with and polysomnographic features were evaluated and compared between two groups. Results: Our final sample was 227 after applying exclusion criteria. The rate of POSA was 48 and 52% of patients had non-POSA. The body mass index (BMI) of the POSA group were significantly lower. Male gender was dominant in both groups. In POSA cases, 25.7% had mild, 38.5% moderate, and 35.8% severe OSA levels. In non-POSA cases, the same ratios were 8.5, 22.9, and 68.6% retrospectively. Positional stage was a risk factor for the severity of AHI score in our study (B = 14.49, p < 0.001, 95% CI 9.66–19.33) according to our analysis. Conclusion: We found significant characteristic sociodemographic and polysomnographic features which differentiate these two conditions. Male gender and high BMI constituted considerable risk of severe OSA. Although gender presents an unchangeable risk factor, it has been shown that the most important risk factor for non-POSA is body weight which is a modifiable risk factor.