PERFORMANCE COMPARISON OF 15 TRANSPORT VENTILATORS
Fig. 2. PaCO2, arterial pH, and ratio of PaO2 to fraction of inspired oxygen (FIO2) in lung-injured sheep during ventilation with 14 transport ventilator models. Each set of values represents data from a single sheep. Assessment was performed on 2 sheep with each ventilator. The large variability in the ratio of PaO2 to fraction of inspired oxygen (PaO2/FIO2) is because some of the ventilators only offer 1 or 2 FIO2 settings, and because of the level of gas exchange in each sheep. The Vortran RespirTech Pro could not be used on the animals we tested. The Percussionaire TXP and the Vortran RespirTech Pro could not be set to the specifications required by the lung model. U Univent Eagle 754. P Pulmonetic Systems LTV 1000. V VersaMed iVent. B Bird Avian. M Oceanic Medical Products Magellan. N Newport HT50. PT Pneupac Parapac Transport 200D. PM Pneupac Parapac Medic. C Pneupac Compac 200. BI Bio-Med Devices IC2A. BC Bio-Med Devices Crossvent 3. CV Carevent ATV. A Life Support Products AutoVent 2000. PC Percussionaire TXP.
ports are to and from diagnostic areas, the operating room, or the emergency department.
It is well documented that transport ventilators provide more stable gas exchange and hemodynamics than manual ventilators.10–13 Gervais et al11 observed severe respiratory alkalosis during transport with manual ventilation. In 20 pa- tients transported to diagnostic areas, Braman et al12 found substantial respiratory acidosis or alkalosis and hemodynamic compromise in 16 patients receiving manual ventilation. Hurst et al13 also documented respiratory alkalosis during intra- hospital transport of 28 patients receiving manual ventilation. Nakamura et al10 also observed greater variability of gas exchange and hemodynamics during transport with manual ventilation than with a transport ventilator.
Types of Transport Ventilators
Austin et al3 classified transport ventilators into 3 cat- egories, based on their capabilities: automatic resuscita-
tors, simple transport ventilators, and sophisticated trans- port ventilators. They defined a simple transport ventilator as one that provides a specified rate and volume with a high-pressure relief valve,3 whereas a sophisticated trans- port ventilator has modes that allow spontaneous breath- ing, and additional alarms and monitors of gas delivery. Five of the ventilators we evaluated were sophisticated: Newport HT50, Univent Eagle 754, VersaMed iVent, Pul- monetic Systems LTV 1000, Bird Avian.
We considered the Newport HT50 and the Univent Eagle 754 most suited for use in forward military po- sitions, because they have longer battery life (8 hours and 4 hours, respectively). The VersaMed iVent was the heaviest of the units evaluated (10 kg). However, the Newport HT50, Univent Eagle 754, VersaMed iVent, and Pulmonetic Systems LTV 1000 clearly could func- tion exceptionally well in all transport settings if they had longer battery life. The Bird Avian was the most
RESPIRATORY CARE JUNE 2007 VOL 52 NO 6