ENDOTRACHEAL TUBES and the ADS 2000
1. The proper function of any ventilator depends on a good seal between the trachea
and the tube cuff. Small leaks will cause the Minute Volume Per Kilogram to be
inaccurate, while larger leaks will not allow the peak inspiratory pressure to be
reached in a reasonable time if at all.
2. Small tubes should have the adapter on the OUTSIDE, rather than the inside of the
tube. When they are on the inside, the adapter narrows the opening significantly and
can seriously interfere with respiration. This is, of course, true whether positive pressure
ventilation is used or not. In fact, it is even more important for "regular" anesthesia
systems.
3. The cuff should be tested to be sure there are no leaks. Fill and cap the cuff,
then submerge in water to check for leaks.
4. A good seal must be made to the patient, but care should be used not to put too
much pressure on the trachea since excessive pressure can damage tissue.
24 Engler Engineering Corporation ADS 2000
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