Effect of short-term positive airway pressure on blood pressure in controlled hypertensive patients with obstructive sleep apnoea syndrome: a prospective cohort study.

Background: Obstructive sleep apnoea syndrome (OSAS) is associated with cardiovascular disease, especially in patients with high blood pressure. Continuous positive airway pressure (CPAP) seems to contribute to blood pressure control in patients with OSAS, mainly those with uncontrolled hypertension. However, the effect of CPAP on controlled hypertensive patients with OSAS is not known.