Advances in the Diagnosis and Treatment of Obstructive Sleep Apnea in Women

Obstructive sleep apnea (OSA) in women is often underdiagnosed due to various and different symptoms, significant delay of referrals, sex-specific polysomnographic patterns that are usually not detected by standard severity indices from the home sleep apnea test, and limitations of current screening tools. Up to 75% of women with OSA remain undiagnosed, with relevant clinical and socioeconomic consequences. Women often report daytime fatigue, insomnia, depression, anxiety, and poor sleep quality rather than excessive daytime sleepiness or snoring, which may lead to fewer sleep clinic referrals. Additionally, the menstrual phase significantly influences symptom expression. Comorbidities also exhibit sex-based differences: OSA in premenopausal women is strongly linked to depression, metabolic syndrome, and polycystic ovary syndrome, while postmenopausal women with OSA reported hypertension and diabetes more frequently, leading to a greater cardiometabolic risk in postmenopausal women with OSA. The screening questionnaires showed numerous limitations in women due to the lack of items concerning symptoms. Women's typical polysomnographic pattern, especially in the premenopause period, is characterized by predominant hypopneas, mild OSA with prevalent rapid eye movement (REM)-OSA, respiratory effort-related arousals (RERAs), and low arousal threshold, highlighting the crucial role of sleep fragmentation evaluation, beyond the apnea-hypopnea index (AHI). New indices such as hypoxic burden, pulse wave amplitude drops index and arousal burden may provide more appropriate OSA severity classification and risk stratification in women.After a review of the literature, we proposed four women phenotypes, highlighting the heterogeneity of OSA in women and the key role of sex-tailored OSA management. From a therapeutic perspective, women differ in apnea-hypopnea index (PAP) compliance, required lower PAP levels for the same disease severity as men, and experience mask-related side effects. However, we have to mention that this is suspected to be biased due to significant lower number of women included in cohorts and even lower in randomized controlled trials (RCTs). Mandibular advancement devices (MADs) and endotype-based pharmacotherapy may be beneficial in women with mild OSA and low arousal threshold or low muscle responsiveness. Emerging evidence suggests that a sex-centered approach to screening, diagnosis, and treatment may reduce the clinical and socioeconomic burden of OSA in women in the future.