The Science Journal of the American Association for Respiratory Care

2011 OPEN FORUM Abstracts

MEASUREMENT OF SUB TIDAL VOLUME AND MEAN AIRWAY PRESSURE CHANGES AS A RESULT OF RESISTANCE CHANGES ON THE HIGH FREQUENCY PERCUSSIVE VENTILATOR. A BENCH STUDY.

Greg Merritt, Brian K. Walsh, Brandon Daigle; Children's Medical Center, Allen, TX

Introduction: The High Frequency Percussive Ventilator has been successfully used in the treatment of inhalation injury. It has been particularly successful with airway secretion mobilization. This device theoretically improves ventilation and oxygenation with a lung protective strategy. This bench study was designed to evaluate the changes in sub tidal volumes and Mean Airway Pressure with changes in airway resistance. Methods: The High Frequency Percussive Ventilator was setup with a PIP of 22 cm H2O, Demand PEEP of 2 cm H2O, Oscillatory PEEP= 6 cm H2O, I-Time 3.2 seconds, E-Time 2.9 seconds, phase 10 bpm; percussion rate = 340 bpm. The ASL 5000 was setup with a Residual Volume of .5 L, Compliance of 8 ml/ cm H2O, and Resistance at 120 cm H2O/L/sec, 80 cm H2O/L/sec, and 40 cm H2O/L/sec respectively. Results: Sub Tidal Volume measurements are given over a sample (34 sub tidal breaths) taken from a 1000 breath measurement. Conclusion: The High Frequency Percussive Ventilator demonstrated as much as a 46% Inspiratory sub Tidal Volume increase with a decrease in resistance from 120 H2O/L/sec to 40 H2O/L/sec. This also showed a 14% decrease in Mean Airway Pressure. The improvement in airway resistance leads to an increased tidal volume delivery and a minor decrease in Mean Airway Resistance. Further study of sub tidal volume delivered needs to be done to get a better understanding
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