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Abbreviated method for assessing upper airway function in obstructive sleep apnea.

A Boudewyns1, N Punjabi, P H Van de Heyning

  • 1Department of Otorhinolaryngology, University Hospital, Antwerp, Belgium. an.boudewijns@uza.uia.ac.be

Chest
|October 18, 2000
PubMed
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Body position significantly impacts upper airway critical closing pressure (Pcrit) in obstructive sleep apnea (OSA) patients, decreasing in the lateral position. Sleep stage did not affect Pcrit or upstream resistance (RN).

Area of Science:

  • Respiratory Physiology
  • Sleep Medicine
  • Medical Devices

Background:

  • Obstructive sleep apnea (OSA) is characterized by upper airway collapse during sleep.
  • Upper airway airflow is influenced by critical closing pressure (Pcrit) and upstream resistance (RN).
  • Standardized methods are needed to accurately measure these parameters.

Purpose of the Study:

  • To develop and validate a protocol for assessing upper airway pressure-flow relationships.
  • To investigate the effects of body position and sleep stage on Pcrit and RN in OSA patients.

Main Methods:

  • Developed a standardized protocol to derive quasi-steady-state upper airway pressure-flow relationships.
  • Measured Pcrit and RN in 10 obese patients with severe OSA.
  • Assessed pressure-flow relationships in supine and lateral positions during non-rapid eye movement (NREM) sleep, and supine during rapid eye movement (REM) sleep.

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Main Results:

  • A significant decrease in Pcrit was observed in the lateral recumbent position compared to the supine position (-1.1 vs. 1.8 cm H2O).
  • Upstream resistance (RN) did not significantly change with body position.
  • Neither Pcrit nor RN showed significant changes related to sleep stage (NREM vs. REM).

Conclusions:

  • The developed method allows for reliable, repeated measurements of Pcrit during a single night.
  • Body position, specifically the lateral recumbent position, significantly reduces Pcrit in OSA patients.
  • These findings aid in understanding OSA pathophysiology and may inform treatment strategies.