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Objective To test the hypothesis that sleep-related breathing disorder (SRBD) is associated with poor blood pressure control in hypertensive patients independent from confounding factors such as age, body mass index, alcohol, smoking and daytime blood gases.

Design and methods This cross-sectional study of a sleep laboratory cohort was carried out at the University Hospital Sleep Disorders Centre, Marburg. The study comprised 599 patients referred for a sleep study, all of them with a documented history of systemic hypertension and/or previously initiated antihypertensive therapy. Data were obtained from a clinical interview, two unattended sleep studies and assessment of clinic blood pressure, cholesterol level, alcohol and nicotine consumption and daytime blood gases. The main outcome measure was a post hoc analysis of predictors for poor blood pressure control.

Results Respiratory disturbance index …