The Science Journal of the American Association for Respiratory Care

1998 OPEN FORUM Abstracts

A NEW PISTON VENTILATOR DELIVERS ACCURATE VOLUMES AND FLOWS WITH HELIOX DURING CMV

James B. Fink, MS, RRT. Hines VA Hospital, Division of Pulmonary and Critical Care Medicine, Loyola Stritch School of Medicine, Hines, IL

Background: He:O_{2} has been advocated for use during controlled mechanical ventilation (CMV) of patients with severe acute airway obstruction to reduce work of breathing and lung pressures, but most ventilators will not reliably deliver the set volumes and flows with a low density gas. Our goal was to determine whether a new ventilator, utilizing a piston with a 50 micron gap, would reliably administer He:O_{2} at set parameters.

Method: To determine the effect of He:O_{2} during CMV, a new piston drive ventilator (Nellcor Puritan Bennet 740) was attached to a test lung (TTL, Michigan Instruments). Humidity was provided with an active humidifier (MR 730 Fisher-Paykel) and a heated wire circuit (Isothermal, Baxter Health Care). The ventilator was set to parameters reflecting the range of the device, V_{T} 50 to 1500ml, peak inspiratory flow 10 to 150 L/min with both oxygen and He:O_{2} 70:30. ANOVA was performed with p < 0.05 considered significant.

Results: At all settings tested, the delivered volumes and flows were similar with both He:O_{2} 70:30 and oxygen (p>0.86).

Conclusion: The NPB 740 ventilator provided accurate tidal volumes and inspiratory flow rates with both He:O_{2} 70:30 and oxygen, across the full range of parameters tested.

Funded by a grant from Nellcor Puritan Bennett

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

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