Abstract
Eighteen healthy cats were anesthetized, paralyzed, and ventilated with either the IDC VS600 or Bunnell Lifepulse (BLP). Mean airway pressure (Paw) and rates were constant as I:E increased from 1:8 to 1:1. Next, Paw and I:E were constant as rates increased from 100-600 bpm. The two machines behaved similarly in terms of I:E and quite differently in terms of rate. As I:E increased, both ventilators maintained normal pH and PCO2 values until 1:2, then hypercarbia and acidemia developed. As rates increased, the VS600 maintained normal pH and PCO2 values until 250 bpm; the BLP did so until 600 bpm. Above these rates, hypercarbia and acidemia developed. At all rates and I:E ratios, AaDO2 were higher with the BLP; Paw was higher with the VS600, but not significantly so. Conclusions: 1) The VS600 produced better arterial oxygenation and somewhat higher Paw. 2) The BLP produced better ventilation over a wider range of rates. 3) Different high frequency jet ventilators perform differently. The conclusions from the studies of one system cannot, and should not, be applied to any other.
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