Cosmed Quark PFT, Manual

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80 - Quark PFT User Manual
P0,1 (Respiratory drive)
Aim of the test
The test named P0,1 or Respiratory Drive consists of evaluating the reduction of
pressure caused by the patient's inhalation.
In order to evaluate the P0,1 the subjects breaths in a mouthpiece provided with a
shutter and a pressure detector, by determining a shut down of the respiratory ways for
100 msec at the beginning of the inhalation, its possible to measure the reduction of
pressure. The shut down is so short that the patient keeps breathing normally without
realising it. Many other measurement can be carried out making the patient inhale
increasing concentration of CO
2
and verifying the results.
Setting respiratory drive options
1. Select Settings... from Options menu.
2. Select Respiratory drive
3. Set the desired value in all the fields described in the next table.
Option Description
Vt Stability threshold Recognition criterion of regular respiration
Recommendations
•
Connect the P0.1 valve on the “breathing valve” connector on the front panel of the
Quark system.
•
Verify that the cylinder driving the P0.1 valve (O
2
-CO
2
) is open.
Perform the test
1. Select Respiratory Drive from the Test menu and wait for the green led is
prompted on the right side of the screen.
2. Breath at rest until the message “Press F2...” is prompted.
3. Wait for the Patient establish a regular breathing pattern and press
F2 whenever
you want to close the inspiratory valve for measuring the P0.1 parameter.
4. Repeat the above mentioned manoeuvre several time both in room air or with
enhanced CO
2
inspiratory gas.
5. Press F3 to end the test.