Chest
Clinical InvestigationsSelf-Reported vs Measured Compliance with Nasal CPAP for Obstructive Sleep Apnea
Section snippets
Patients
We included 63 consecutive OSA patients (55 male, 8 female) prescribed nasal CPAP for a minimum of 3 months. At the time of the study, they were receiving nasal CPAP for 18 ± 1 months, with a wide range from 4 to 42 months. Mean age of our study population was 53.7 ± 1.2 years. During the initial study, apnea hypopnea index (AHI) was 50.8 ± 2.9, and lowest oxyhemoglobin saturation (SaO2) was 65.6 ± 2.3 percent. Our subjects were moderately obese (body mass index [BMI] baseline: 32.3 ± 0.8) and
RESULTS
The frequency distribution of measured use times per night in our patients is given in Figure 1. As Um was above 4 h a night in 45 of our 63 patients, we found long-term compliance with nasal CPAP of 71 percent for a mean treatment period of 18 months. Mean measured time of use was 4.9 ± 0.3 h per night, with a wide range from 0.2 to 8.3. In contrast, our patients reported to use their CPAP device for 6.3 ± 0.2 nights a week and 6.5 ± 0.2 h a night, which theoretically would equal a mean use
DISCUSSION
Despite significant correlations between measured and reported times of CPAP use per night, self-reports turned out to be an inaccurate tool to determine compliance with nasal CPAP therapy for OSA. Trying to estimate daily use time by simply asking how many hours a night the patient uses the device generally results in a considerable misestimation of actual mean treatment time per night because the patient is likely to provide the number of hours of CPAP use solely for the nights it was worn.
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2020, Sleep Medicine Clinics
Manuscript received July 9; revision accepted October 7.