The Science Journal of the American Association for Respiratory Care

2009 OPEN FORUM Abstracts

A COMPARISON OF THREE VENTILATORS AND THEIR HELIOX CONSUMPTION EFFICIENCY

Thomas D. Baxter, Holly Coulliette; Respiratory Care, St. Johns River Community College, St. Augustine, FL

Background: How efficient ventilators with heliox capability are in terms of heliox consumption was evaluated. Three ICU ventilators that have a heliox feature were studied using a simple bench technique. Method: The following ventilators were evaluated: Maquet SERVO-i (Solna, Sweden), Hamilton G-5 (Rhazuns, Switzerland), Cardinal Health AVEA (Yorba Linda, CA). During testing each ventilator was connected to an H-cylinder of 80:20 heliox using a heliox regulator (Western Medica, Westlake, OH) and a heliox high pressure hose. An H-cylinder of 100% medical grade oxygen was connected using a high pressure oxygen hose to the other ventilator gas connector. The ventilator being tested was connected to a test lung using a patient circuit without humidification. A size 7.0 I.D. RĂ¼sch endotracheal tube (ETT) (Teleflex Medical, Research Triangle Park, NC) was attached to the circuit wye-connector. The ETT cuffed end was placed into a 6-inch piece of tygon tubing and inflated until no leak was present. The ETT tubing adapter was then connected to a test lung (B & B Medical Technologies, Carlsbad, CA). Each ventilator was set for volume control with a tidal volume of 500 ml, a rate of 15 breaths/minute, and inspiratory time of 0.9 seconds. The oxygen delivery control was set to 21% (80:20 heliox). Ventilation was begun with each ventilator’s start-up procedure and the start time was noted. The ventilators were run continuously until the low inlet pressure alarm sounded and/or the pressure regulator read zero. Results: All three ventilators cycled consistently with the heliox mixture. Table 1 shows the results of the time duration for each ventilator. Conclusion: There was little difference in the rate of heliox consumption in two of the three ventilators, while the third had a much higher (66.8%) rate of consumption. This may have been due to the internal blending system the Avea uses is dual proportional solenoids that require a minimum flow to maintain the blended oxygen percentage and cannot shut off during exhalation. Sponsored Research - None

Table 1

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