Abstract
Introduction
In resource-limited settings, obstructive sleep apnea (OSA) often goes undiagnosed as polysomnography (PSG) is expensive, time-consuming, and not readily available. Imaging studies of upper airway have been tried as alternatives to PSG to screen for OSA. However, racial differences in upper airway anatomy preclude generalizability of such studies. We sought to test the hypothesis that ultrasonography (USG), an inexpensive, readily available tool to study soft tissue structures of the upper airway, would have predictive value for OSA in South Asian people.
Methods
Adult patients with sleep-related complaints suspicious for OSA were taken for overnight PSG. After the PSG, consecutive patients with and without OSA were studied with submental ultrasonography to measure tongue base thickness (TBT) and lateral pharyngeal wall thickness (LPWT).
Results
Among 50 patients with OSA and 25 controls, mean age was 43.9 ± 11.4 years, and 39 were men. Patients with OSA had higher TBT (6.77 ± 0.63 cm vs 6.34 ± 0.54 cm, P value = 0.004) and higher LPWT (2.47 ± 0.60 cm vs 2.12 ± 0.26 cm, P value = 0.006) compared to patients without OSA. On multivariate analysis, TBT, LPWT, and neck circumference were identified as independent factors associated with OSA. These variables could identify patients with severe OSA with a sensitivity of 72% and a specificity of 76%.
Conclusion
Patients with OSA have higher tongue base thickness and lateral pharyngeal wall thickness proportionate to the severity of the disease, independent of BMI and neck circumference. These findings suggest that sub-mental ultrasonography may be useful to identify patients with severe OSA in resource-limited settings.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- USG:
-
Ultrasonography
- MRI:
-
Magnetic resonance imaging
- CT:
-
Computed tomography
- OSA:
-
Obstructive sleep apnea
- LPWT:
-
Lateral pharyngeal wall thickness
- TBT:
-
Tongue base thickness
- CPAP:
-
Continuous positive airway pressure
- PSG:
-
Polysomnography
- AHI:
-
Apnea/hypopnea index
- NC:
-
Neck circumference
- WC:
-
Waist circumference
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Acknowledgements
We would like to acknowledge the support of the staff of Sleep Laboratory of Department of Medicine, and all the patients who consented for participating in this study.
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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. Dr Atul Malhotra is funded by the US National Institutes of Health. Dr Atul Malhotra reports income related to medical education from Livanova, Equillium, Corvus, and Jazz. All other authors declare that they have no financial disclosures relevant to this article.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Bhavesh Mohan Lal and Surabhi Vyas. The first draft of the manuscript was written by Bhavesh Mohan Lal and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Institute ethics committee approval was taken and the study was performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. All persons gave their informed consent prior to their inclusion in the study.
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All authors declare that they have no conflict of interest. ResMed provided a philanthropic donation to UC San Diego School of Medicine, San Diego 92121, 358 CA, USA.
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Mohan Lal, B., Vyas, S., Malhotra, A. et al. Ultrasonography of the neck in patients with obstructive sleep apnea. Sleep Breath 27, 903–912 (2023). https://doi.org/10.1007/s11325-022-02682-3
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DOI: https://doi.org/10.1007/s11325-022-02682-3