Abstract
Fatigue and sleep disorders are prevalent in cancer patients. Obstructive sleep apnea (OSA) commonly causes excessive daytime sleepiness (EDS) and fatigue. We hypothesize that treating cancer patients with OSA using positive airway pressure (PAP) will improve EDS and fatigue. A retrospective chart review of sleep clinic visits of cancer patients with newly diagnosed OSA was performed. Epworth Sleepiness Scale (ESS) and fatigue reported at baseline and within 6 months of starting PAP therapy were compared between PAP-adherent and PAP-non-adherent patients. 65 cancer patients with OSA and ESS >10 were recommended PAP therapy, including 45 patients with fatigue. 29 patients pursued PAP therapy with 79% (n = 23) adherent at follow-up. The median baseline apnea hypopnea index (AHI) for OSA was 24.0 (interquartile range [IQR] 14.3, 32.3) and 23.8 (IQR 10.1, 42.8) events/hour among PAP-adherent and PAP-non-adherent patients, respectively (p = 0.90). Median baseline ESS was 14.0 (IQR 12.0, 17.0) among adherent and 17.0 (IQR 11.0, 17.3) among non-adherent patients (p = 0.73). The median ESS at follow-up of the adherent and non-adherent groups was 8.0 (IQR 6.0, 10.0) and 11.0 (IQR 8.0, 15.8), respectively (p = 0.08). Median ESS change was -5.0 (IQR -7.0, -4.0) in PAP adherent patients and -2.5 (IQR -5.25, -1.50) in PAP-non-adherent patients (p = 0.07). When the groups are examined separately, the median change in the PAP-adherent group was highly significant (p = 0.001), while the ESS median change in the PAP-non-adherent group was considerably less (p = 0.04). 17out of the 21 PAP-adherent patients reporting fatigue at baseline indicated improvement at follow-up. PAP therapy for OSA in cancer patients improves EDS and fatigue. Larger studies are necessary to evaluate the efficacy of PAP in improving fatigue in this population.
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