Service manual

IQmark Digital Spirometer Operation Manual
46
where X is the Minimum FVC
Length configuration setting
(default is 6 sec.)
Poor effort PEF not reached within 120 ms. Poor effort: Blast out
faster; blast out harder
Interrupted flow Cough or interruption detected. Blast out smoothly
Abrupt stop No plateau of duration of at
least one second in which there
is less than 0.050 liters of
volume change.
Blast out completely
Inhalation volume is greater
than the Exhalation Volume
Inhale > 1.1 * exhalation if
inhalation performed.
Inhale deeper before
starting the test.
Exhalation volume is greater
than the Inhalation Volume
Exhale > 1.1 * inhalation if
inhalation performed.
Inhale completely at
the end of the test.
This acceptability statement
was added by Midmark
Diagnostics Group
Volume less than 0.50 Liters Volume Too Low
After the patient has completed the number of tests you require, click the Save Review
button in the lower right corner of the test screen. This will automatically save the test
session and display the review screen.
See section G, Reviewing Patient Reports, later in this manual for more information about
the View Report screen.
If a patient’s FVC is below expectations or if you suspect airway obstruction, you might
require the patient to perform a slow vital capacity (SVC) or VC test.
Flow Volume Loops – Why Inhale?
Diagnostic Reasons
The inhalation side of the flow volume loop can be used to determine if an Upper Airway
Obstruction (UAO) is fixed or dynamic (variable). A fixed UAO decreases rates in both
expiratory flow and inspiratory flow. A variable UAO decreases rates in expiratory flow
or inspiratory flow, not both.
Extrathoracic (outside the chest area, i.e. in the throat) airway obstruction decreases rates
in the inspiratory flow.
Intrathoracic (inside the chest area, i.e. in the airway tubes leading directly to the lungs)
airway obstruction decreases rates in the expiratory flow.
Typically a patient will present with stridor (crowing or wheezing breathing sounds)
and/or dyspnea (shortness of breath) on exertion. The common causes are vocal cord
paralysis, swelling of the upper airway or voice box, enlarged thyroid gland or goiter, a
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