EvitaXL

Measurements
Intrinsic PEEP – PEEPi
Intrinsic PEEP – PEEPi
Intrinsic PEEP is measured in two phases: EvitaXL keeps the
inspiration and expiration valves closed during measuring
phase 1, so that it is impossible for gas to flow into the ventilation
system from inspiration and to escape from it. During this
closed phase, pressure is equalized between the lungs and
the ventilation system. EvitaXL measures the pressure curve.
Measuring phase 1 is ended:
— when there is no further change in the pressure curve but at
the earliest after 0.5 seconds,
— at the latest after 3 seconds in adult mode or after
1.5 seconds in paediatric mode.
The start value corresponds to PEEP, and the value at the end
of the closed phase is the Intrinsic PEEP.
At the end of measuring phase 1, EvitaXL opens the expiration
valve and measures the expiratory flow generated by intrinsic
PEEP during measuring phase 2. During this period, the lung
is depressurised to PEEP. Measuring phase 2 is ended:
— when the expiration flow has returned to 0 but at the earliest
after 0.5 seconds.
— at the latest after 7 seconds in adult mode or after
3.5 seconds in paediatric mode.
The integrated flow corresponds to the air volume trapped in
the lungs Vtrap by Intrinsic PEEP.
Measuring times of measuring phase 1 for Intrinsic PEEP:
For adult ventilation max. 3 seconds
For paediatric ventilation max. 1.5 seconds
Measuring times of measuring phase 2 for Vtrap:
For adult ventilation max. 7 seconds
For paediatric ventilation max. 3.5 seconds
226 Instructions for Use EvitaXL
PAW
PEEP
Flow
insp. and exp.
valves closed exp. valve opens
Measuring
time 1
Intrinsic PEEP
Measuring
time 2
Vtrap
t
t
026