Datex-Ohmeda 2 Vap. Trolley, Руководство по эксплуатации, Страница: 66 / 104

Aestiva
3-30
1006-0938-000
Measure circuit compliance
To measure compressible volume in patient tubes:
1. Set the ventilator to volume control mode.
2. Set a tidal volume (V
T
) of 500 mL
3. Set a rate of 10 breaths/min.
4. Set an I:E ratio of 1: 1
5. Set the Plimit control to 30 cmH
2
O.
6. Occlude the patient connection of the Y piece. Do not contaminate a clean
patient connection.
7. Turn on mechanical ventilation.
8. Monitor the exhaled tidal volume V
TE
and P
max
(measured peak airway
pressure).
The V
TE
measures the gas needed to fill the patient circuit at the measured
pressure.
The example shows how tubing compliance factor can be calculated.
V
TE
/(P
max
–2.5 1 cmH
2
O) = Compliance factor in mL per cmH
2
O
Example:
P
max
= 21 cmH
2
O
V
TE
= 24 mL
24/(21–2.5) = 1.3 mL/cmH
2
O
This factor can be used to calculate the approximate gas compression in
patient tubes.
For example, if the patient is requiring 30 cmH
2
O to ventilate,
30 X 1.3 = 39 mL of gas is compressed in the tubes each breath. This gas
(39 mL) is part of the set tidal volume but it does not reach the patient.
1
Force of the Bellows.