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Related Experiment Videos

A method for measuring passive elastance during proportional assist ventilation.

M Younes1, K Webster, J Kun

  • 1Sections of Respiratory and Critical Care Medicine, Department of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada. younesmk@cc.umanitoba.ca

American Journal of Respiratory and Critical Care Medicine
|July 4, 2001
PubMed
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A new method reliably estimates respiratory elastance (E) during proportional assist ventilation (PAV) using airway pressure changes during end-inspiratory occlusions. This noninvasive technique offers a practical solution for monitoring lung mechanics in ventilated patients.

Area of Science:

  • Respiratory mechanics
  • Mechanical ventilation
  • Pulmonary diagnostics

Background:

  • Noninvasive monitoring of respiratory elastance (E) during assisted ventilation is currently lacking.
  • Proportional Assist Ventilation (PAV) presents unique opportunities for such measurements due to its pressure-assist mechanics.

Purpose of the Study:

  • To describe and validate a novel, noninvasive method for estimating respiratory elastance during PAV.
  • To assess the reliability of this method by comparing it to traditional measurements.

Main Methods:

  • A cohort of 74 ventilator-dependent patients ventilated in PAV mode was studied.
  • Brief end-inspiratory occlusions were applied, and airway pressure (Paw) changes were analyzed 0.25 seconds after occlusion onset (P0.25).
  • Estimated elastance during PAV (EPAV) was compared to passive elastance measured during controlled ventilation (ECMV).

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Main Results:

  • The magnitude of early Paw change during occlusion correlated inversely with the level of assist.
  • P0.25 was found to include minimal inspiratory effort and was free from extraneous events.
  • EPAV showed excellent agreement with ECMV (r = 0.92), with a small average difference.

Conclusions:

  • Airway pressure measured 0.25 seconds after end-inspiratory occlusion onset during PAV reliably estimates passive respiratory elastance.
  • This method provides a practical and noninvasive approach to monitor lung mechanics in patients receiving PAV.