OBTAINING GOOD MVV RESULTS
MVV results are also extremely effort-dependent.
Obtaining a Good MVV Result:
1. Explain the test and what you expect.
2. Demonstrate how to put the disposable mouthpiece in the mouth
(teeth on the outside, forming a good seal with the lips).
3. Demonstrate how a maneuver is done by breathing in and out
quickly and deeply for a few seconds.
4. Coach your patient throughout the test.
5. Learn to recognize most poor maneuvers by observing the
patient:
An acceptable maneuver requires:
l
at least six seconds of test time
l
a rapid pace
Unacceptable conditions include:
l
air leaking around the mouthpiece
l
mouthpiece obstruction by tongue, lips, or teeth
l
quitting too soon
DOING AN MVV MANEUVER
1. Upon selection of MVV the PneumoCheck first measures zero
airflow through the pneumotach to assure maximum accuracy.
During this time (no more than seven seconds) the word
STEADY is displayed and it is important to hold the Pneumo-
Check still so that an accurate reference can be made. If the
PneumoCheck is moved during this time, the STEADY message
will remain until the PneumoCheck is held quite still for at least
three seconds, or until an UNSTEADY message appears.
Should an UNSTEADY message appear, depress the TEST
button to start MVV again.
2. The PneumoCheck then displays the message DO MVV 1,
and beeps.
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