The Science Journal of the American Association for Respiratory Care

2007 OPEN FORUM Abstracts

TIDAL VOLUME ACCURACY ON BIO-MED CROSSVENT 3

R. Blake1, 2, L. Baker1, 2, E. Petersen1, 2, K. Gooderum1, 2, J. Findlay1, S. Holets1


Background:
The Crossvent 3+ is a new to the market, portable ventilator that is marketed as the first portable ventilator with capabilities to ventilate neonatal and patients and volume ventilate whereas transport ventilators to date, are pressure ventilators.

Main Question:
Does the Bio-Med Crossvent 3 perform according to manufacturer specifications? Do the measured tidal volumes of the Bio-Med Crossvent 3 correlate with the set tidal volumes? A deviation of 10% would be considered acceptable.

Methods:
Bench test the Crossvent 3 using a Respironics Vent-check to verify the Crossvent 3 delivers volumes within 10% of set tidal volume on the ventilator. Testing apparatus consisted of a Respironics Vent-Check connected in line to a Novaplus Sheridan/HVT Cuffed Murphy Eye endotracheal tube to deliver positive pressure ventilation to a Michigan Test Lung using various size endotracheal tubes and varying compliance factors to simulate a normal adult, adult with a high respiratory demand, and an adult with poor compliance similar to a patient with Acute Respiratory Distress Syndrome. A neonatal patient was also simulated.

Settings:
Ventilator settings were as follows:

Normal Adult Lung: Vt 500mL, Rate 15, Mode A/C, Peep 5 cm H20, Trigger -2cm H20, Flow 40 LPM

Adult with high respiratory demand: Vt 500mL, Rate 30, Mode A/C, Peep 5 cm H20, Trigger -2cm H20, Flow 70LPM

Adult with poor lung compliance (ARDS: Vt 350mL, Rate 20, Mode A/C, Peep 20 cm H20, Trigger -2cm H20, Flow 40LPM

Neonatal: Tidal Volume 20mL, Rate 40, Mode A/C, Peep 3 cm H20, Trigger -1 cm H20, Flow 1.7LPM

Results:
From this study it can be concluded that the tidal volumes are accurate according to manufacturer’s specifications and ISO Standards for adult patient scenarios that were tested. All of these scenarios were within 10% above or below the set tidal volume. For the neonatal patient scenario using a tidal volume of 20mL, it was found that this was inaccurate according to the specifications that were set. On average the tidal volumes were lower than the set tidal volume by 23%. The manufacturer states that this ventilator can be used from 5-2500mL tidal volumes but only claims accuracy at a tidal volume above 100mL. Even though the manufacturer does not claim for this to be accurate at this level, this has clinical significance because on a neonatal patient the tidal volumes are so low that they need to be as accurate as possible to prevent complications of underventilation.

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