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Sleep and Breathing

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07-08-2023 | Sleep Apnea | Sleep Breathing Physiology and Disorders • Original Article

Relationship between airflow limitation in response to upper airway negative pressure during wakefulness and obstructive sleep apnea severity

Authors: Jan Lim, Hisham Alshaer, Nasim Montazeri Ghahjaverestan, T. Douglas Bradley

Published in: Sleep and Breathing | Issue 1/2024

Abstract

Purpose

The objective was to determine if alteration in airflow induced by negative pressure (NP) applied to participants’ upper airways during wakefulness, is related to obstructive sleep apnea (OSA) severity as determined by the apnea–hypopnea index (AHI).

Methods

Adults 18 years of age or greater were recruited. All participants underwent overnight polysomnography to assess their apnea–hypopnea index (AHI). While awake, participants were twice exposed, orally, to -3 cm H₂O of NP for five full breaths. The ratio of the breathing volumes of the last two breaths during NP exposure to the last two breaths prior to NP exposure was deemed the NP ratio (NPR).

Results

Eighteen participants were enrolled. A strong relationship between the AHI and the exponentially transformed NPR (ExpNPR) for all participants was observed (R² = 0.55, p < 0.001). A multivariable model using the independent variable ExpNPR, age, body mass index and sex accounted for 81% of variability in AHI (p = 0.0006). A leave-one-subject-out cross-validation analysis revealed that predicted AHI using the multivariable model, and actual AHI from participants’ polysomnograms, were strongly related (R² = 0.72, p < 0.001).

Conclusion

We conclude that ExpNPR, was strongly related to the AHI, independently of demographic factors known to be related to the AHI.

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Title: Relationship between airflow limitation in response to upper airway negative pressure during wakefulness and obstructive sleep apnea severity
Authors: Jan Lim
Hisham Alshaer
Nasim Montazeri Ghahjaverestan
T. Douglas Bradley
Publication date: 07-08-2023
Publisher: Springer International Publishing
Keywords: Sleep Apnea
Polysomnography
Published in: Sleep and Breathing / Issue 1/2024
Print ISSN: 1520-9512
Electronic ISSN: 1522-1709
DOI: https://doi.org/10.1007/s11325-023-02892-3

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Abstract

Purpose

Methods

Results

Conclusion

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