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How does changing the rate in Control Mode (CMV) effect the inspiratory flow wave form?

Equipment

• Hamilton Medical Galileo ventilator, set up as a time cycled ventilator
• IngmarTest lung, equipped with patient simulator

Constant settings

To demonstrate the effect that Control rate change has on the inspiratory flow wave form the following ventilator parameters will be held constant.

1. volume oriented time cycled ventilation
2. Assist control mode
3. tidal volume 500 ml
4. inspiratory time% 25
5. Square wave
6. Fio2 1.00
7. PEEP 5
8. Sensitivity pressure trigger -3cmh2o

Control rate change

The Control rate will be decreased and data collected at each rate change.How will the inspiratory flow wave form be effected by the rate change?

1. Will the inspiratory flow wave form shape change?
2. Will the peak flow change?
3. Will the Inspiratory time change?
4. Will the expiratory time change?
5. Will the I:E ratio change?

Examine the following inspiratory flow waveforms for clues.

When you compare the descending secquence of inspiratory flow waveforms, what changes did you notice? Does the peak flow change as you go from a rate of 15 down to 6? What about inspiratory and expiratory time? from 15 down to 6. Look at the data. What changes, and what dosn't.

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