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Operation
Special Functions
Special procedure: Occlusion pressure P 0.1
The occlusion pressure P 0.1 characterises the negative
pressure during a short occlusion (0.1 s) at the start of
spontaneous inspiration.
It is a direct measure of the neuro-muscular breathing
drive.
For patients with healthy lungs and regular breathing, a
pressure drop of –3 to –4 mbar = P 0.1.
High values represent a high breathing drive which can
only be maintained for a short time.
Values greater than –6 mbar for a patient with chronic
obstructive pulmonary disease indicate impending
exhaustion (respiratory muscle fatigue).
This special measuring procedure can be used in all
ventilation modes in order to check the breathing drive of
a spontaneously breathing patient or to assess the
amount of spontaneous breathing during controlled
ventilation.
To select the P 0.1 occlusion pressure measuring
procedure:
Press the »Special proc.« key and touch screen
key »P 0.1«.
Display (example):
The measured value and time of the last measurement is
displayed on the screen.
To start the P 0.1 occlusion pressure measuring
procedure:
Touch the »Start« screen key.
The P 0.1 special procedure runs automatically.
At the end of the procedure, the displayed curve is
automatically stopped.
To evaluate the measured value at a particular time:
Position the l cursor on the time by turning the dial-
knob.
The relevant measured value is displayed above the
curve.
Evita 4 displays the P 0.1 value as a negative
pressure without the minus sign.
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