The Science Journal of the American Association for Respiratory Care

2012 OPEN FORUM Abstracts


Jonathan Jacobs, Jamie Costello, Craig Karnes, Whitney Woods, Aaron E. Light; Respiratory Therapy, Ozarks Technical Community College, Springfield, MO

Introduction: Bench studies reported as abstracts in 2006 demonstrated that not all ventilators report accurate lung compliance measurements. The purpose of this study was to compare a set compliance (Cs) on a Michigan test lung to the measured Cs on four new generation ventilators not previously studied. Method: The ventilators tested were the Drager XL, Hamilton G5, Drager Infinity V500, and the GE Engstrom Carestation. The ventilators were set to volume control mode with a tidal volume of 500 ml, respiratory rate of 12 bpm, PEEP of 0 cmH2O, and an inspiratory time of 0.9 seconds. The ventilators were individually attached to a Michigan test lung model 5601i. Compliance on the test lung was set to 100, 80, 60, 40, and 20 ml/cmH2O respectfully and verified with a Med Graphics 3 Syringe per manufacturers guidelines. Each time the compliance was changed the setting was verified per manufacture guidelines. Each ventilator was attached to the test lung at the different Cs settings and the ventilators reported Cs value were recorded. The reported values from the ventilator were then compared to the set values of the test lung. Results: The ventilators ranked in the following order from most accurate to least accurate (overall percent differences from the control value are in parenthesis): GE (8.4%) with 5.9% std, Drager V500 (15.3%) with 4.88% std, Hamilton G5 (16.33%) with a 7.1% std, Drager XL (37.3%) with 18.98 std. Conclusion: In this bench test, we found that when compared to the set compliance from the Michigan Test Lung the GE ventilator was the most accurate. All four ventilators varied with their ability to measure Cs compared to set values. Sponsored Research - None Reported Compliance Values values in ml/cmH2O