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Hai-Hua Chuang,1– 3 Chi-Hung Liu,4 Chao-Yung Wang,5 Yu-Lun Lo,6 Guo-She Lee,7,8 Yi-Ping Chao,4,9 Hsueh-Yu Li,10 Terry BJ Kuo,11 Cheryl CH Yang,11 Liang-Yu Shyu,12 Li-Ang Lee10,11 1Department of Family Medicine, Chang Gung Memorial Hospital, Taipei Branch and Linkou Main Branch, Chang Gung University, Taoyuan, Taiwan; 2Department of Industrial Engineering and Management, National Taipei University of Technology, Taipei, Taiwan; 3Genomic Medicine Institute & Obesity Institute, Geisinger Medical, Danville, PA, USA; 4Department of Neurology, Chang Gung Memorial Hospital, Linkou Main Branch, Chang Gung University, Taoyuan, Taiwan; 5Department of Cardiology, Chang Gung Memorial Hospital, Linkou Main Branch, Chang Gung University, Taoyuan, Taiwan; 6Department of Pulmonary and Critical Care Medicine, Chang Gung Memorial Hospital, Linkou Main Branch, Chang Gung University, Taoyuan, Taiwan; 7Faculty of Medicine, National Yang-Ming University, Taipei, Taiwan; 8Department of Otolaryngology, Taipei City Hospital, Ren-Ai Branch, Taipei, Taiwan; 9Department of Computer Science and Information Engineering, Chang Gung University, Taoyuan, Taiwan; 10Department of Otorhinolaryngology-Head and Neck Surgery, Chang Gung Memorial Hospital, Linkou Main Branch, Chang Gung University, Taoyuan, Taiwan; 11Institute of Brain Science, National Yang-Ming University, Taipei, Taiwan; 12Department of Biomedical Engineering, Chung Yuan Christian University, Taoyuan, TaiwanCorrespondence: Li-Ang LeeDepartments of Otorhinolaryngology-Head and Neck Surgery, Sleep Center, Chang Gung Memorial Hospital, Linkou Main Branch, No. 5, Fu-Hsing Street, Guishan District, Taoyuan, 33305, TaiwanTel +886 33281200 ext. 3972Fax +886 33979361Email 5738@cgmh.org.twBackground: Obstructive sleep apnea (OSA) and snoring have been reported to be modifiable risk factors for thick carotid intima-media thickness (CIMT) and carotid atherosclerosis, which are closely linked to cardiovascular disease.Methods: This cross-sectional study prospectively recruited 70 participants with OSA and without a history of carotid artery disorder, who primarily sought surgical Intervention. OSA and snoring were assessed with the Epworth Sleepiness Scale, Snore Outcomes Survey, polysomnography, and snoring sound recording. The carotid arteries were evaluated with ultrasonography and divided into three types of carotid artery profiles (normal carotid artery, thick CIMT, or significant carotid atherosclerosis). Multivariate linear/logistic/categorical regressions were performed with the forward selection approaches/logistic least absolute shrinkage and selection operator, as appropriate.Results: Normalized snoring sound energy (301– 850 Hz) was independently associated with the carotid intima-media thickness (regression coefficient [β] = 0.01, standard error [SE] = 0.004, P = 0.03; R2 = 0.067) and type of carotid profile (β = 0.40, SE = 0.09, P < 0.001; R2 = 0.156). Normalized snoring sound energy (4– 300 Hz) (β = − 0.10, SE = 0.04, P = 0.01) and female sex (β = 1.90, SE = 0.94, P = 0.04) were independently related to the presence of carotid stenosis (R2 = 0.159). The optimal regression model of the type of carotid artery profile included normalized snoring sound energy (301– 850 Hz) (β = 0.33, SE = 0.14, P = 0.03), snoring time (β = 0.26, SE = 0.13, P = 0.047), female sex (β = 0.26, SE = 0.13, P = 0.047), and increased age (β = 0.20, SE = 0.10, P = 0.04) under the control of the Snore Outcomes Survey score, 3% oxygen desaturation index, snoring sound energy (4– 1500 Hz), normalized snoring sound energy (851– 1500 Hz), cigarette smoking, and hyperlipidemia (R2 = 0.427).Conclusion: Our findings suggested that snoring sound characteristics are associated with carotid artery profiles among early OSA patients who cannot be noticed by ultrasound because organic changes of the carotid artery have not yet started. Future studies are warranted to verify the clinical significance of the results.Keywords: atherosclerosis, common carotid artery, categorical regression, obstructive sleep apnea, snoring, ultrasound

Purpose: This study aimed to investigate (1) the role of mouth puffing phenomenon and upper airway features in obstructive sleep apnea (OSA) and (2) whether mouth-taping during sleep alleviated the severity of OSA., Participants and Methods: Seventy-one participants underwent a two-night home sleep test (the first day sleeping normally; the second day sleeping with their mouths being taped); their oximetry desaturation index (ODI) and mouth puffing signals (non-mouth puffing, complete mouth puffing, intermittent mouth puffing (IMP), and side mouth puffing) were detected by a validated fingertip pulse oximeter and a mouth puffing detector. The participants were grouped into the ODI-improved group and the ODI-not-improved group according to their sleeping test results. The radiograph was taken by cone-beam computed tomography and cephalometries. Upper airway features including airways, soft tissues, and oral cavity variables were measured., Results: Participants with severe OSA showed a higher IMP percentage compared with those with normal, mild, and moderate OSA (severe: 33.78%, moderate: 22.38%, mild: 14.55%, normal: 0.31%, p < 0.001). In all participants, the ODI and the percentage of SpO 2 under 90 (T90) were positively related to body mass index (BMI) (r = 0.310 and 0.333, respectively), while ODI and T90 were negatively correlated with the minimum width of the airway (r = -0.473 and -0.474, respectively); all mentioned relationships were significant (p < 0.05)., Conclusion: IMP proportions were found to be higher in the half of participants whose ODI did not improve after mouth-taping and in those with severe OSA. Moreover, OSA patients with higher ODI, higher T90, and higher proportions of IMP were more likely to have a narrower upper airway., Competing Interests: The authors report no conflicts of interest in this work., (© 2023 Jau et al.)