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Sleep quality and overnight polysomnography findings among obstructive sleep apnea patients

Previous studies aimed to determine if Pittsburgh sleep quality index was a valid screening instrument for obstructive sleep apnea (OSA), indicated its’ disadvantages. However, the rationale of Pittsburgh sleep quality index use in sleep clinics is not the screening, but the assessment of sleep quality itself. Therefore, the aim of this study was to investigate the sleep quality in OSA patients and to identify the cut- off point for differentiation of „good” and „poor” sleepers among them. We constructed the Croatian version of the Pittsburgh sleep quality index (PSQI) questionnaire and assessed its’ psychometric properties. The protocol of the study included the assessment of sleep quality using the constructed and validated Croatian PSQI questionnaire in 130 OSA patients and 75 healthy control subjects. All subjects completed the Croatian version of PSQI, and the patients underwent overnight polysomnography screening. OSA patients had higher values of the global PSQI component score, indicating lower sleep quality, compared to a healthy control group (P<0.001). The psychometric properties of PSQI scores in the prediction of normal sleep efficiency indicated that the cut-off score of 9.5 differentiated patients in total sleep time (P=0.001), REM duration (P=0.014), sleep efficiency (P=0.001), time spent awake during sleep (P=0.006), and after sleep onset (P=0.001). Current findings enhance the interpretability of PSQI results in the population of OSA patients.

sleep quality; polysomnography; obstructive sleep apnea

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