Sleep apnea, hypertension, and the effects of continuous positive airway pressure

Abstract

Background: Sleep apnea is being studied as a risk factor for hypertension. This observational chart review was conducted to determine the long-term effects of continuous positive airway pressure (CPAP) treatment on blood pressure (BP) in a sample of sleep apnea patients from urban and rural populations. Methods: This study was conducted using data from 180 clinical charts from 1995 to 2002. Patients were identified as hypertensive or normotensive by their initial BP values before they were diagnosed with sleep apnea and were also reviewed after the use of CPAP. Results: Of the patients diagnosed with sleep apnea, 32% were found to have hypertension (mean systolic BP: 164.4 ± 20.3 mm Hg; mean diastolic BP: 96.9 ± 5.3 mm Hg). The average use of CPAP was 12.1 ± 22.4 months. The hypertensive group showed a significant reduction in BP with CPAP use: systolic BP dropped by an average of 11.2 mm Hg (P