Posture-dependent change of tracheal sounds at standardized flows in patients with obstructive sleep apnea

Chest
H PasterkampG R Wodicka

Abstract

The ability of awake subjects with obstructive sleep apnea (OSA) to dilate their pharynx during inspiration may be defective. Airflow through a relatively more narrow pharyngeal passage should lead to increased flow turbulence and hence to louder respiratory sounds. We therefore studied the increase of tracheal sound intensity (TSI) in the supine position as an indicator of abnormal pharyngeal dynamics in patients with documented OSA. Sound was recorded with a contact sensor at the suprasternal notch in 7 patients with OSA (age, 52 +/- 8 years; body mass index, 29.0 +/- 3; apnea-hypopnea index, 58 +/- 17; means +/- SD), and in 8 control subjects, including obese subjects and snorers (age, 39 +/- 8 years; body mass index, 28.6 +/- 4). Subjects breathed through a pneumotachograph and aimed at target flows of 1.5 to 2 L/s, first sitting, then supine. Flow and sound signals were digitized at a 10-KHz rate. Fourier analysis was applied to sounds within the target flow range and average power spectra were obtained. Spectral power was calculated for frequency bands 0.2 to 1, 1 to 2, and 2 to 3 KHz. In the supine position, OSA patients had a significantly greater increase of inspiratory TSI than control subjects: 7.5 +/- 1.2 dB vs 1.7 ...Continue Reading

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Citations

Mar 4, 2000·Medical & Biological Engineering & Computing·H PasterkampS S Kraman
Nov 10, 2011·Annals of Biomedical Engineering·Aman MontazeriZahra Moussavi
Mar 28, 2006·Otolaryngology--head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery·Rauf TahamilerSalih Canakcioglu
Oct 6, 1997·American Journal of Respiratory and Critical Care Medicine·H PasterkampG R Wodicka
Jan 17, 2008·Chest·José Antonio FizHans Pasterkamp
Apr 21, 2009·Archivos de bronconeumología·José Antonio FizRaimon Jané
Mar 20, 2004·Pediatric Pulmonology. Supplement·Hans Pasterkamp
May 9, 2001·IEEE Transactions on Bio-medical Engineering·P HarperG R Wodicka
Mar 6, 2003·IEEE Transactions on Bio-medical Engineering·V Paul HarperGeorge R Wodicka
Dec 2, 2015·Clinical and Experimental Otorhinolaryngology·Jeong-Whun KimJi-Hun Mo
Dec 2, 2014·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Mirja TenhunenSari-Leena Himanen
Aug 3, 2010·Medical Engineering & Physics·Azadeh Yadollahi, Zahra Moussavi
Apr 22, 2006·Journal of Applied Physiology·Steve S KramanHans Pasterkamp
Feb 5, 2021·Journal of Sleep Research·Nasim Montazeri GhahjaverestanAzadeh Yadollahi
Jun 7, 2005·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Y QiuK Anderson
Jun 16, 2017··Jagmohan ChauhanSuranga Seneviratne

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