Abstract
Purpose
It is known that oronasal masks are not as effective at opening the upper airway compared to nasal only continuous positive airway pressure (CPAP) masks in patients with sleep-disordered breathing. However, the physiological mechanism for this difference in efficacy is not known; although, it has been hypothesized to involve the retroglossal and/or retropalatal region of the upper airway. The objective of this study was to investigate differences in retroglossal and retropalatal anterior-posterior space with the use of oronasal vs. nasal CPAP masks using real-time cine magnetic resonance imaging (cMRI).
Methods
Ten subjects (eight men, two women) with obstructive sleep apnea (OSA) were given cMRI with both nasal and oronasal CPAP masks. Each subject was imaged with each interface at pressures of 5, 10, and 15 cm of H2O, while in the supine position along the sagittal plane.
Results
The oronasal mask produced significantly less airway opening in the retropalatal region of the upper airway compared to the nasal mask interface. During exhalation, mask style had a significant effect on anterior-posterior distance p = 0.016. No differences were found in the retroglossal region between mask styles.
Conclusions
Our study confirmed previous findings showing differences in treatment efficacy between oronasal and nasal mask styles. We have shown anatomic evidence that the nasal mask is more effective in opening the upper airway compared to the oronasal mask in the retropalatal region.
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Acknowledgments
Support provided by the National Institutes of Health—National Center for Advancing Translational Sciences, Grant # UL1 TR000457-06
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The authors of this study have no financial disclosures.
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Author contribution
Matthew R. Ebben was involved with all aspects of this study and agrees to be accountable for all aspects of this work.
Sara Milrad contributed to acquisition and analysis of data, revised the manuscript for intellectual content, and approved the final version of the manuscript and agrees to be accountable for all aspects of this work.
Jonathan P. Dyke contributed to acquisition and analysis of data, revised the manuscript for intellectual content, and approved the final version of the manuscript and agrees to be accountable for all aspects of this work.
C. Douglas Phillips contributed to conception and design of the study, revised the manuscript for intellectual content, and approved the final version of the manuscript and agrees to be accountable for all aspects of this work.
Ana C. Krieger contributed to conception and design of the study, revised the manuscript for intellectual content, and approved the final version of the manuscript and agrees to be accountable for all aspects of this work.
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This study was registered on Clinicaltrials.gov on August 13, 2013 (#NCT01939938)
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Ebben, M.R., Milrad, S., Dyke, J.P. et al. Comparison of the upper airway dynamics of oronasal and nasal masks with positive airway pressure treatment using cine magnetic resonance imaging. Sleep Breath 20, 79–85 (2016). https://doi.org/10.1007/s11325-015-1187-x
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DOI: https://doi.org/10.1007/s11325-015-1187-x