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Related Experiment Videos

Work of breathing after extubation

A M Ishaaya1, S D Nathan, M J Belman

  • 1Division of Pulmonary Medicine, Cedars Sinai Medical Center, Los Angeles.

Chest
|January 1, 1995
PubMed
Summary

Increased work of breathing after extubation is not due to tracheal or glottic narrowing. This suggests more proximal upper airway narrowing, like the oropharynx, causes higher respiratory effort post-extubation.

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Area of Science:

  • Critical Care Medicine
  • Respiratory Physiology

Background:

  • Work of breathing (WOB) increases after extubation compared to breathing through an endotracheal tube.
  • The specific site of increased airway resistance post-extubation remains unclear.

Purpose of the Study:

  • To investigate the glottis and trachea as potential sites of increased airway resistance after extubation.
  • To compare respiratory mechanics during mechanical ventilation, spontaneous breathing via endotracheal tube, and after extubation.

Main Methods:

  • Measured breathing pattern, work of breathing (WOB), and pressure-time product (PTP) in eight patients undergoing mechanical ventilation weaning.
  • Acquired data during pressure support ventilation (PSV), spontaneous breathing (SB) via endotracheal tube, and post-extubation.
  • Performed bronchoscopy during extubation to examine the trachea and measure glottic cross-sectional area.

Main Results:

  • WOB and PTP were significantly lower during PSV than SB post-extubation (p < 0.05).
  • WOB and PTP were significantly higher post-extubation compared to SB via endotracheal tube (p < 0.05).
  • No tracheal or glottic narrowing was observed; measured glottic area exceeded endotracheal tube area.

Conclusions:

  • Tracheal or laryngeal narrowing does not cause increased work of breathing after extubation.
  • Data suggest more proximal upper airway narrowing (oropharynx/velopharynx) is responsible for elevated respiratory work post-extubation.

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