This subproject is one of many research subprojects utilizing theresources provided by a Center grant funded by NIH/NCRR. The subproject andinvestigator (PI) may have received primary funding from another NIH source,and thus could be represented in other CRISP entries. The institution listed isfor the Center, which is not necessarily the institution for the investigator.The hypothesis of this study is that continuous positive airway pressure (CPAP) will change body organ level symptoms such as the level of sleep apnea and hypertension, which will lead to a decrease in daytime sleepiness and improved daytime functioning. The primary aim is to conduct a double-blind, placebo randomized controlled study of the functional improvement efficacy of CPAP in those with less severe obstructive sleep apnea (OSA) (levels <30). The secondary aims are to document the reduction in subjective and objective daytime sleepiness and in 24-hour mean blood pressure. Subjects will undergo 8 weeks of either real CPAP or CPAP without the PAP. Those on initial sham treatment will crossover to CPAP. Enrollees will complete the Functional Outcome of Sleep Questionnaire (FOSQ), Subjective Test of Sleepiness (ESS), Psychomotor Vigilance Test (PVT), and Epworth Sleepiness Scale (ESS) at the beginning and at the end of 8 weeks. 24-hour blood-pressure monitoring will also be performed at these times. Diaries will be kept. Although CPAP has been shown to improve function in severe OSA, the data regarding its effect on less severe disease has been controversial and the methods flawed in the selection of a proper control group. The investigators will use a new device that effectively serves as a control for CPAP and is safe for use. This study is a multi-center trial.
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