2023-03-082023-03-082007-01-12Ursavaş, A. vd. (2007). "Relationship between serum substance P levels and daytime sleepiness in obstructive sleep apnea syndrome". Chest, 131(5), 1400-1405.0012-3692https://doi.org/10.1378/chest.06-2348https://www.sciencedirect.com/science/article/pii/S0012369215316093http://hdl.handle.net/11452/31419Objective: We hypothesized that intermittent hypoxia might influence serum substance P levels, and that this effect might in turn contribute in excessive daytime sleepiness (EDS) in patients with obstructive sleep apnea syndrome (OSAS). Patients and methods: Fifty-five patients with newly diagnosed OSAS and 15 age-matched nonapneic control subjects were enrolled in this study. Full polysomnography was performed in all patients. Single blood samples were drawn between 8:00 Am and 9:00 Am after the sleep study. Substance P levels were analyzed with a competitive enzyme immunoassay (substance P EIA kit; Cayman Chemical; Ann Arbor, MI). Results: There were no significant differences in age, gender, body mass index, smoking habit, and snoring between the two groups. Serum substance P levels in the OSAS group were significantly lower than that in the control group (p < 0.0001). Serum substance P levels were positively correlated with rapid eye movement sleep (r = 0.330, p = 0.049) and slow-wave sleep (r = 0.324, p = 0.049) phases. Serum substance P levels were negatively correlated with Epworth sleepiness scale score (r = - 0.253, p = 0.048), number of total apneas during the night (r = - 0.247, p = 0.036), number of respiratory events during the night (r = - 0.266, p = 0.024), apnea-hypopnea index (r = - 0.287, p = 0.015), respiratory arousal index (r = - 0.267, p 0.026), time spent in apnea and hypopnea (r = - 0.307, p 0.01), average oxygen desaturation (r=- 0.265, p = 0.026), and oxygen desaturation index (r=- 0.254, p = 0.031). Conclusion: We concluded that EDS seen in some of the OSAS patients might be associated with various pathophysiologic mechanisms including substance P levels.eninfo:eu-repo/semantics/closedAccessObstructive sleep apnea syndromeFibromyalgiaGeneral & internal medicineRespiratory systemSleepinessSubstance PMetabolitesDepressionReceptorsSerotoninNeuronsSampleBrainRatsMenArticle0002465447000222-s2.0-3424858239014001405131517494790Critical care medicineRespiratory systemNeurokinin-1 Receptors; Substance P; SenktideDaytime somnolenceSubstance PAdultApneaArticleComparative studyControlled studyFemaleSlow wave sleepHumanPathophysiologyHypoxiaMajor clinical studyMalePriority journalREM sleepScoring systemSleep apnea syndrome