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Effects of positive airway pressure treatment on clinical measures of hypertension and type 2 diabetes.

Prasad B, Carley DW, Krishnan JA, Weaver TE, Weaver FM. Effects of positive airway pressure treatment on clinical measures of hypertension and type 2 diabetes. Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine. 2012 Oct 15; 8(5):481-7.

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PURPOSE: Mechanistic and observational studies support an independent increase in risk of hypertension and abnormal glucose metabolism associated with obstructive sleep apnea (OSA). However, the specific populations and outcomes that improve with treatment of OSA in clinical practice are not established. We examined the effectiveness of OSA treatment on clinical blood pressure and diabetes control measures in men with preexisting systemic hypertension or type 2 diabetes. METHODS: A retrospective cohort of veterans (n = 221) with a new diagnosis of OSA and initiation of positive airway pressure treatment was identified using administrative databases and clinical records. MEASUREMENTS AND RESULTS: Outcomes were changes in blood pressure (BP; mean of 3 highest recordings; systolic and diastolic) and glycemic control (mean of 3 highest fasting glucose and hemoglobinA1C values) at 3-6 months (T1) and 9-12 months (T2) following treatment compared to pretreatment. A generalized estimating equation model was used with adjustment for potential confounders: demographics, body mass index (BMI), OSA severity, Charlson comorbidity index, and pharmacologic treatment for hypertension and diabetes. Sustained independent effects of OSA treatment (mean change [95% CI]) were noted in both systolic BP (T1; -7.44 [-10.41 to -4.47] and T2; -6.81 [-9.94 to -3.67]) and diastolic BP (T1; -3.14, [-4.99 to -1.29] and T2; -3.69, [-5.53 to -1.85]). Diabetes control measures did not change with OSA treatment. CONCLUSIONS: Treatment of OSA improves office blood pressure in hypertensive men. Prospective studies are necessary to better characterize specific populations with OSA that benefit from treatment with respect to progression of hypertension and type 2 diabetes.

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