The ventilators comprised four flow-generating ventilators (Galileo, Hamilton Medical AG, Rhazuns, Switzerland; Raphael, Hamilton Medical AG Rhazuns, Switzerland; Servo 300, Seimens LSS, Solna, Sweden; Servo 900, Seimens LSS, Solna, Sweden), two turbine-driven ventilators (LTV[R], Pulmonetic, Minneapolis, USA; Ivent[TM], Versamed, New York, USA) and two fluid logic ventilators (Oxylo[R] 1000, Drager, Lubeck, Germany; Oxylog[R] 3000, Drager, Lubeck, Germany).
One of the fluid logic ventilators (Oxylog 1000) was excluded from the testing as the parameters tested could not be accurately set.
As with the other ventilators tested, the fluid logic ventilator (Oxylog 3000) did not accurately deliver, or measure, the prescribed Vv However, during this study the [V.sub.DEL] tended to be higher than [V.sub.MEAS] for most of the parameters tested.
Table 6 reveals that all the ventilators maintained pressures within 20% of the set pressure with the exception of the fluid logic ventilator (Oxylog 3000).
The fluid logic ventilator (Oxylog 3000) in this study performed poorly in maintaining set oxygen levels especially during the low [V.sub.T] and poor compliance settings.