CareFusion MicroRPM Manuel D'utilisation page 38

To measure the maximum expiratory pressure (PEmax), slide the
switch from the "off" position to the MIP/MEP position. Rotating
segments will be displayed whilst the unit performs an auto-zero
function. During this time there should be no applied pressure.
When the unit is ready for use 0 will be displayed.
To perform an expiratory pressure test instruct the subject to insert
the mouthpiece into the mouth ensuring that the flange is positioned
over the gums and inside the lips and that the "bite blocks" are
between the teeth. They should then inhale to TLC (total lung
capacity) and then exhale with as much effort as possible through the
controlled leak of the meter for at least 2 seconds. The reading
displayed is the maximum average expiratory pressure over 1 second.
For an accurate measurement it is important that there are no leaks
in the system other than the small controlled leak of the instrument.
This leak prevents the generation of a false high reading generated by
closure of the glottis and compression of air in the mouth using the
facial muscles.
Before repeating the measurement, or before performing an
inspiratory manoeuvre, the instrument must be reset by sliding the
switch to the "off" position.
To measure the maximum inspiratory pressure (PImax) follow the
above procedure but with the valve marked inspiratory pressure
connected. Slide the switch on the face of the meter from 'off'
position to the MIP/MEP position and instruct the subject to exhale to
RV (residual volume) through the mouthpiece and then to inhale with
as much effort as possible for at least 2 seconds.
The reading displayed is the maximum average inspiratory pressure
that was sustained over 1 second.
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