CareFusion MicroLoop Manuel D'utilisation page 21

'
Touch' the MVV icon to select this mode of testing and the display
will instruct the patient to start breathing hard to commence the
test.
It is recommended that the patient perform 3 tidal breathing
manoeuvres prior to performing hard and fast rapid breathing
(required for the MVV manoeuvre).
The patient should be instructed to
tidally breathe. The tidal breaths are
automatically detected prior to
commencing the MVV manoeuvre.
19