6-26
With Leakage compensation
With automatic leakage compensation, the ventilator delivers 660 mL on the basis of the
measured leakage minute volume, instead of the 600 mL set.
600 mL enter the lung and the displayed inspiratory tidal volume TV is 600 mL.
The volume of 500 mL measured on the expiration side is displayed without compensation,
even when leakage compensation is activated.
The minute volume measured on the expiration side is 5.0 L/min and is also uncompensated.
If this were not so, the alarm for a low minute volume could be inhibited by the expiratory
leakage compensation. The ventilator must always emit an alarm if the minute volume is too
low.
With leakage compensation, the set TV determines the volume to be delivered to the patient.
This example has been simplified:
In fact, the calculated leakage correction takes into account the pressures in the hose system.
A higher percentage volume is lost on the inspiration side than on the expiration side because
the pressure during inspiration is higher.
The displayed leakage minute volume MVleak is based on the mean pressure Pmean.
The leakage minute volume MVLeak also takes the inspiratory leaks into account. The sum
of the minute volume MV + the leakage minute volume MVLeak is consequently greater
than the inspiratory minute volume delivered to the patient.
Unlimited volume compensation is inappropriate.
The ventilator compensates for losses of up to 100 % of the set tidal volume TV.
Due to technical tolerances, a small leakage minute volume may be displayed even if the
hose system is leakproof.
6.7 Set Alarm Limits
You can set the alarm limits for Paw, MV, ftotal and TVe by pressing the [Alarm Setup] key
and selecting alarm limits in the accessed menu. You can set EtCO
2
alarm limits if your
ventilator is configured with CO
2
module. You can also set alarm volume and apnea time
(Tapnea). For details, refer to 10 Alarms.
6.8 Start Ventilation
WARNING
Before using the ventilator on the patient, check that the oxygen concentration in
the delivered gas is consistent with the setting value.
Adopt manual ventilation immediately if the ventilator malfunctions and cannot
continue ventilating the patient.
Select [Start Ventilation] in Standby status, and the system begins to ventilate the patient
according to your settings.
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General