High Rapid Eye Movement Sleep Apnea Hypopnea Index is Associated with Hypertension in Patients with Obstructive Sleep Apnea

PURPOSE: Obstructive sleep apnea (OSA) plays an important role in the pathogenesis of hypertension. The aim of this cross-sectional study was to explore the clinical and polysomnographic characteristics of OSA patients with hypertension and to explore the gender differences in the relationship between rapid eye movement (REM) OSA and hypertension. PATIENTS AND METHODS: A total of 808 patients with OSA at a tertiary hospital were enrolled in this study, and OSA patients were divided into groups presenting with or without hypertension. The clinical and polysomnographic characteristics were compared between the groups. Multivariate binary logistic analysis was performed to assess the association between REM OSA and hypertension. RESULTS: After adjustment for potential confounders, the risk of hypertension in patients with OSA increased with severity categories of apnea hypopnea index during rapid eye movement sleep stage (REM AHI) (OR = 1.61 for REM AHI ≥58.87 events/h relative to REM AHI <30.50 events/h, 95% CI 1.07–2.42, P = 0.022). Consistent with this, when taken as a continuous variable, this association still remains significant (OR = 1.007, 95% CI 1.001–1.014, P < 0.05). This effect was more pronounced in women patients, the OR for REM AHI ≥57.24 events/h relative to REM AHI <30.36 events/h was 2.79 (95% CI, 1.16–6.73; P = 0.022); however, there was no significant difference in male patients. CONCLUSION: REM AHI was significantly and positively associated with hypertension in patients with OSA, and the effect was more pronounced in female patients.