Abstract
Purpose
Craniofacial abnormalities have an important role in the occurrence of obstructive sleep apnea (OSA) and may be particularly significant in Asian patients, although obesity and functional abnormalities such as reduced lung volume and increased airway resistance also may be important. We conducted simultaneous analyses of their interrelationships to evaluate the relative contributions of obesity, craniofacial structure, pulmonary function, and airway resistance to the severity of Japanese OSA because there are little data in this area.
Methods
A cross-sectional observational study was performed on 134 consecutive Japanese male patients. A sleep study, lateral cephalometry, pulmonary function tests, and impulse oscillometry (IOS) were performed on all patients.
Results
Age, body mass index (BMI), position of the hyoid bone, and proximal airway resistance on IOS (R20) were significantly related to the apnea/hypopnea index (AHI) (p < 0.05) in multiple regression analysis. Subgroup analysis showed that, for moderate-to-severe OSA (AHI ≥ 15 events/h), neck circumference and R20 were predominantly related to AHI, whereas for non-to-mild OSA (AHI < 15 events/h), age and expiratory reserve volume were the predominant determinants. In obese subjects (BMI ≥ 25 kg/m2), alveolar–arterial oxygen tension difference, position of the hyoid bone, and R20 were significantly associated with AHI, whereas age alone was a significant factor in nonobese subjects (BMI < 25 kg/m2).
Conclusions
Aside from age and obesity, anatomical and functional abnormalities are significantly related to the severity of Japanese OSA. Predominant determinants of AHI differed depending on the severity of OSA or the magnitude of obesity.
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Role of funding sources
Kazuo Chin has received grants from the Japanese Ministry of Education, Culture, Sports, Science and Technology (nos. 20590921 and 22590760), Respiratory Failure Research Group and Health Science Research Grants (Comprehensive Research on Life-Style Related Diseases including Cardiovascular Diseases and Diabetes Mellitus) from the Ministry of Health, Labor and Welfare of Japan, and the Japan Vascular Disease Research Foundation.
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Aihara, K., Oga, T., Harada, Y. et al. Analysis of anatomical and functional determinants of obstructive sleep apnea. Sleep Breath 16, 473–481 (2012). https://doi.org/10.1007/s11325-011-0528-7
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DOI: https://doi.org/10.1007/s11325-011-0528-7