The Science Journal of the American Association for Respiratory Care

2000 OPEN FORUM Abstracts

Proportional Assist Ventilation (PAV)

Dean R. Hess, PhD, RRT, FAARC Massachusetts General Hospital, Boston, Massachusetts

Proportional assist ventilation is a mode of ventilation based upon the Equation of Motion. The ventilator monitors the patient's inspiratory flow and volume. Pressure is applied to the airway to proportionately unload the respiratory muscles. This mode is attractive to improve patient-ventilator synchrony. Despite the publication of numerous clinical studies of proportional assist ventilation for invasive and noninvasive ventilation, it is not yet approved for use in the United States.
Objectives
1. Compare pressure control ventilation, pressure support ventilation, and proportional assist ventilation
2. Describe the Equation of Motion as it applies to proportional assist ventilation
3. Discuss the evidence for use of proportional assist ventilation
4. Describe the issue of runaway during proportional assist ventilation
Outline
A. Pressure control versus pressure support versus proportional assist ventilation
1 Flow dys-synchrony during mechanical ventilation
B. Equation of Motion and proportional assist ventilation
C. Review of the evidence supporting proportional assist ventilation
D. Runaway

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