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Airflow Shape Is Associated With the Pharyngeal Structure Causing OSA.

Pedro R Genta1, Scott A Sands2, James P Butler3

  • 1Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA; Pulmonary Division, Heart Institute (InCor), Hospital das Clínicas, University of São Paulo School of Medicine, São Paulo, Brazil.

Chest
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Summary

Inspiratory flow shape in obstructive sleep apnea (OSA) patients correlates with the specific pharyngeal structure causing airway collapse. This finding may help identify collapse mechanisms noninvasively.

Keywords:
OSAflow shapesite of pharyngeal collapse

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Area of Science:

  • Sleep Medicine
  • Respiratory Physiology
  • Otolaryngology

Background:

  • Obstructive sleep apnea (OSA) arises from the collapse of various pharyngeal structures, including the soft palate, tongue, lateral walls, and epiglottis.
  • The specific collapsing structure influences treatment strategies for OSA, particularly non-positive airway pressure (non-CPAP) therapies.
  • Observed variations in inspiratory airflow patterns among OSA patients suggest a link to underlying anatomical factors.

Purpose of the Study:

  • To investigate the hypothesis that inspiratory flow shape in OSA patients reflects the specific pharyngeal structure responsible for airway collapse.
  • To explore the potential of inspiratory flow shape as a noninvasive indicator of OSA-related pharyngeal obstruction.

Main Methods:

  • Thirty-one adult subjects diagnosed with OSA underwent endoscopic examination during natural sleep.
  • Simultaneous nasal airflow and pharyngeal pressure recordings were obtained.
  • Airway collapse mechanisms were categorized (tongue-related, isolated palatal, lateral walls, epiglottis), and inspiratory flow shape was classified using negative effort dependence (NED).

Main Results:

  • A significant association was found between inspiratory flow shape (NED) and the pharyngeal structure causing collapse (P < .001).
  • Tongue-related collapse showed minimal NED (median 19%), isolated palatal and lateral wall collapse demonstrated moderate NED (median 45% and 50%, respectively), and epiglottic collapse exhibited severe NED (median 89%) with abrupt flow changes.
  • These findings were observed in a cohort of 31 OSA patients with a mean apnea-hypopnea index of 54 ± 27 events/h.

Conclusions:

  • The shape of the inspiratory airflow is demonstrably influenced by the specific pharyngeal structure causing airway collapse in obstructive sleep apnea.
  • Analysis of inspiratory flow patterns offers a promising noninvasive method for identifying the pharyngeal structure involved in OSA, potentially guiding treatment decisions.