. We set expectations with our patients that CPAP should be used for a minimum of four hours per night for five to seven nights a week.
The four-hour cutoff is typically used since several studies have shown that four or more hours of CPAP use is associated with normalization of daytime sleepiness as well as improvement in quality of life, neurocognitive function, cardiovascular disease, and diabetes [1-7]. Consequently, insurers and The Centers for Medicare and Medicaid Services (CMS) use four hours per night for 70 percent of nights as the cutoff point differentiating adherence and nonadherence.
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