The Science Journal of the American Association for Respiratory Care

1998 OPEN FORUM Abstracts

SYMPOSIUM: USING VENTILATOR GRAPHICS

Ken D. Hargett BS RRT, The Methodist Hospital, Houston, Texas, Jon O. Nilsestuen PhD, RRT, University of Texas Medical Branch Galveston Texas

This symposium is designed to provide an overview of the clinical use of ventilator graphics. The three lecture series includes the following: 1) Introduction to graphic presentation formats, 2) Analysis of the clinical application of the different displays, 3) Practical applications using real patient case studies.

Introduction: This presentation reviews the standard formats for viewing respiratory parameters on ventilator graphic packages. This includes the three basic ventilatory scalars -- Flow, Pressure and Volume; Loops -- pressure/volume and flow/volume and their associated mechanics, compliance, resistance and work of breathing. The analysis of the ETCO2 waveform and it's relationship to the three scalars will be reviewed. The presentation will also include how to adjust the graphic display to optimize the information displayed.

Clinical Usefulness: The main clinical application of each of the different scalars will be reviewed with special emphasis on the evaluation of the flow signal. Patient ventilator interaction will be discussed, including evaluation of adequate flow, pressure support titration, various modes, adjustment of inspiratory time in Pressure Control Ventilation and evaluation of Auto-PEEP. The flow volume loop will be analyzed with respect to pressure support, bronchodilator therapy and compressible volume. The use of the pressure volume loop will be described with respect to evaluating sensitivity, overdistension, and lung mechanics.

Case Presentations: Patient case scenarios will be presented with video clips illustrating the use of graphic analysis in ventilator management. (e.g. evaluation of Auto-PEEP, analysis of airleak following lung reduction surgery, and the manifestation of tracheal malacia)

The 44th International Respiratory Congress Abstracts-On-DiskĀ®, November 7 - 10, 1998, Atlanta, Georgia.

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