basic ventilator function.. Flow patterns
Help!
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| Square | Constant wave
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| How is the square created | by using high pressure source greater than resistance of lungs
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| 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
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| Caution for square | can increase peak insp pressure and may increase overall mean airway pressure (MAP)
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| Sine | non constant
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| 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.
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| Caution for sine | may result in a decrease in mean airway pressure (MAP)
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| Tapered | decelerating
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| Tapered picture | flow rate at the beginning of insp is high then decreases
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| Tapered charcteristics | tapered wave decelerates flow and decreases peak insp pressures (help keep MAP low)
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| Caution for tapered | may increase insp time to the point that the result is an overall MAP increase
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