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Resp 2.7

basic ventilator function.. Flow patterns

QuestionAnswer
Square Constant wave
How is the square created by using high pressure source greater than resistance of lungs
Square charcteristics flow on insp peaks up and stays constant, flow is not affected by changes in airway resistance and lung compliance, decreases insp time, aids in air distribution
Caution for square can increase peak insp pressure and may increase overall mean airway pressure (MAP)
Sine non constant
Sine charcteristics produces some pattern breath after breath, flow picks ups then slows down, slower flow, less resistance is created; therefore usually get lower peak insp pressures.
Caution for sine may result in a decrease in mean airway pressure (MAP)
Tapered decelerating
Tapered picture flow rate at the beginning of insp is high then decreases
Tapered charcteristics tapered wave decelerates flow and decreases peak insp pressures (help keep MAP low)
Caution for tapered may increase insp time to the point that the result is an overall MAP increase
Created by: TnJFarrington12