RT Journal Article
SR Electronic
T1 Prevalence and predictors of positional sleep apnea in the general population
JF European Respiratory Journal
JO Eur Respir J
FD European Respiratory Society
SP P3585
VO 42
IS Suppl 57
A1 Sopharat Vat
A1 Jose Haba-Rubio
A1 Daniela Andries
A1 Nadia Tobback
A1 Mehdi Tafti
A1 Raphaël Heinzer
YR 2013
UL http://erj.ersjournals.com/content/42/Suppl_57/P3585.abstract
AB Background: Some patients have a predominance of obstructive sleep apnea (OSA) in the supine position (POSA). Identifying patients presenting OSA exclusively in the supine position (POSAexcl) could help selecting candidates for a positional therapy.Objectives: To determine the prevalence and predictors of OSA, POSA and POSAexcl in the general population.Method: 2020 subjects (50.0% women, 57.3 ± 10.7 years old, BMI 25.5 ± 4.3 kg/m2) participating in an ongoing population-based sleep cohort study (HypnoLaus, Lausanne, Switzerland) underwent complete polysomnographic recordings at home. Respiratory events were scored according to the AASM Chicago criteria. POSA was defined as ≥ 50% reduction in AHI from the supine to the non-supine position. POSAexcl was present if AHI returned to normal (<5/h) in the non-supine position.Results: Overall, 73.5% had an AHI ≥5/h. Among these, 73.3% had POSA and 35.7% had POSAexcl. Male to female ratio for OSA, POSA and POSAexcl was 1.35, 0.98 and 0.72 respectively. The main predictors for POSA and POSAexcl were a lower total AHI (p<0.0001) and a lower BMI (p=0.003). In men, a higher waist-hip ratio also tends to predict the presence of POSA (p=0.04). In postmenopausal women, a lower neck circumference is a predictor of POSAexcl (p<0.0001) and a lower BMI of POSA (p=0.013). Age and Mallampati score did not influence the presence of POSA or POSAexcl.Conclusions: A third of the OSA subjects in our population had POSAexcl. A male predominance was observed in OSA but female have more POSA and POSAexcl. Individuals with a lower BMI, AHI and neck size (for postmenopausal women) as well as higher waist-hip ratio (for men) are more likely to have POSA and POSAexcl.