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We previously reported that dronabinol a tetrahydrocannobinol, reduced the apnea hypopnea index (AHI) in patients with obstructive sleep apnea (OSA) in a dose-dependent manner. The aim of this report is to assess the effects of dronabinol on subjective sleep quality and daytime function in the Pharmacotherapy of Apnea by Cannabimimetic Enhancement (PACE) II trial. Methods By random assignment, 73 adults with moderate or severe OSA received either placebo (N = 25), 2.5 mg dronabinol (N = 21), or 10 mg dronabinol (N = 27) daily, 1 hour before bedtime for 6 weeks. Participants completed the Pittsburgh sleep quality index (PSQI) and Functional Outcomes of Sleep Questionnaire (FOSQ-10) at baseline and at the end of intervention. Results Between group comparisons were performed using a one-way ANOVA. At baseline, there were no significant difference between groups in the PSQI or FOSQ-10. When compared to placebo, the 10 mg group had a significant reduction in the global PSQI score (p=0.039). Paired t-test analysis showed, in comparison to the baseline, the subscale and total score of the FOSQ-10 were significantly increased (P=0.005); the global PSQI score, subjective sleep quality score, habitual sleep efficiency score and daytime dysfunction score were significantly reduced (p&amp;lt;0.001, p&amp;lt;0.001, p=0.024, p=0.007 respectively) in the 10 mg group, while no improvement was found in the 2.5 mg or placebo groups. Bivariate correlational analysis was used to identify the relationship between the changes of variables. Both ∆ global PSQI and ∆ total FOSQ were correlated with ∆ESS, but not with change in AHI or sleep parameters such as sleep stage percentage, sleep efficiency, arousal index, minutes of wake after sleep onset, time and duration of oxygen saturation below 90% percent. Conclusion These findings indicate that in addition to its ability to reduce the AHI, dronabinol can improve subjective sleep quality and daytime function in patients with moderate to severe OSA. Support This study was funded by National Institutes of Health, National Heart Lung and Blood Institute Grant Number UM1-HL112856 and National Center for Advancing Translational Sciences, Grant Numbers UL1TR001422 and UL1TR002003.

0679 Effects Of Cannabimimetic Enhancement On Subjective Sleep Quality And Function In Obstructive Sleep Apnea