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Effect of prone positioning in mild to moderate obstructive sleep apnea syndrome

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Abstract

Background

Sleeping in prone position could be effective in the management of obstructive sleep apnea (OSA) syndrome by reducing the gravity effect on the upper airway and hence collapsibility. Effect of pure prone positioning (PPP) treatment was investigated in mild to moderate OSA.

Patients and methods

Twenty-nine mild to moderate OSA patients (17 males, 12 females) who gave informed consent were tested with polysomnography at diagnostic and PPP nights. PPP device consisted of a pillow mounted on a table with a hole in the middle keeping the neck 180° extended in prone position. Mean ± SD of age and AHI were 48.4 ± 10.6 and 15.5 ± 6.2, respectively. Patients did not have abdominal and/or truncalobesity, or any condition that could interfere with prone sleeping.

Results

AHI (mean difference: PPP treatment − diagnostic night: −5.2/h, 95 % confidence interval [CI]: −0.1/h to −10.3/h, p = 0.04) and sleep oxygen saturation below 90 % (mean difference: −1.80 %, 95 % CI: −0.22 % to −3.37 %, p = 0.02) and sleep efficiency (81.0 ± 21.2 % and 88.1 ± 7.1 %, respectively, p = 0.02) were significantly lower in PPP than diagnostic night. Response to PPP treatment defined as AHI <5/h in the PPP night was observed in 15 (51.7 %) patients, with a better rate in female than male patients (9/12 vs. 6/17, respectively, p = 0.03).

Conclusions

To our knowledge, this is the first study to examine the effect of prone positioning in the treatment of mild to moderate OSA. Application of PPP with a more comfortable design in a randomized clinical trial is required to investigate its long term effect in the treatment of mild to moderate OSA.

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Abbreviations

AHI:

Apnea–hypopnea index

AI:

Apnea index

BMI:

Body mass index

CPAP:

Continuous positive airway pressure

ECG:

Electrocardiography

EEG:

Electroencephalography

EMG:

Electromyography

EOG:

Elecrooculography

ESS:

Epworth Sleepiness Scale

HI:

Hypopnea index

ICSD-2:

International Classification of Sleep Disorders 2

MRI:

Magnetic resonance imaging

NREM 1–2 %:

Percentage of non rapid eye movement stage 1 and stage 2 sleep

NREM 3 %:

Percentage of slow wave sleep

NREM:

Non-rapid eye movement

OSA:

Obstructive sleep apnea

PPP:

Pure prone positioning

PSG:

Polysomnography

REM:

Rapid eye movement

SaO2 :

Arterial oxygen saturation

T90%:

Percentage of sleep spent below 90 % SaO2

TST:

Total sleep time

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Acknowledgments

The authors thank Dr. Timothy I. Morgenthaler (Department of Pulmonary Diseases, Critical Care and Sleep Medicine, Mayo Clinic, Rochester, MN, USA) for revising the manuscript and for his helpful comments on the manuscript. The authors also thank Dr. Ahmet Ugur Demir (Department of Pulmonary Diseases, Medical Faculty of Hacettepe University, Ankara, Turkey) for statistical assistance and helpful comments on the manuscript. The authors are grateful to Dr. Vahit Özener (Department of Radiology, Baris Medical Imaging Center, Izmir, Turkey) for radiologic imaging and evaluation of the MRI images of the upper airway.

Author contribution

Arman Afrashi’s contributions were study design, data collection, writing and revising the manuscript. Zeynep Zeren Ucar’s contributions were study data collection, design, statistical analysis, creation of the figures and tables, and writing and revising the manuscript.

Conflict of interest

The authors declare no financial support. Abstract of this study was presented in the CHEST 2011 Annual Meeting in Honolulu, HI.

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Correspondence to Zeynep Zeren Ucar.

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Afrashi, A., Ucar, Z.Z. Effect of prone positioning in mild to moderate obstructive sleep apnea syndrome. Sleep Breath 19, 1027–1034 (2015). https://doi.org/10.1007/s11325-014-0985-x

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