Tidewater Community College
Virginia Beach Campus
Respiratory Care Program
How does adding a inspiratory hold or pause effect inspiratory time, expiratory time and I:E ratio ?
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 inspiratory hold has on inspiratory time, expiratory time and the I:E ratio ,the following ventilator settings will be held constant, while the %Inspiratory hold is gradually increased and data collected.
- volume oriented time cycled ventilation
- Assist control mode
- rate of 15
- inspiratory time% 25
- Square wave
- Fio2 1.00
- PEEP 5
- Sensitivity pressure trigger -3cmh2o
Before you look at the data what do you think will happen to the inspiratory time, expiratory time and the I:E ratio?
Increasing the inspiratory hold
 |
Pause | 0% |
| Tidal Volume | 700ml | |
| Delivered tidal volume | 616 ml | |
| peak airway pressure | 32 cmh20 | |
| mean airway pressure | 10 cmh20 | |
| Inspiratory time | 1 seconds | |
| Expiratory time | 3 seconds | |
| I to E ratio | 1:3 |
 |
Pause | 5% |
| Tidal Volume | 700ml | |
| Delivered tidal volume | 616 ml | |
| peak airway pressure | 33 cmh20 | |
| mean airway pressure | 11 cmh20 | |
| Inspiratory time | 1.2 seconds | |
| Expiratory time | 2.8 seconds | |
| I to E ratio | 1:2.4 |