11. Switch the handle to single breath, "Equilibrium" position #2. Use either the DuPont Calidose Gun or a syringe filled with
Xenon, and puncture the injection site of the face mask or mouthpiece. Add the Xenon as you have the patient take a deep
b
reath. Instruct patient to hold breath for as long as possible. After exhaling the patient should resume normal breathing
while you increase the “Patient Air Flow” control to 50 (an arbitrary figure that can be changed to accommodate the
patient’s breathing pattern).
Advise the patient to breathe normally. Observe breathing bags moving through the front panel windows. Add Oxygen if
necessary for patient comfort.
NOTE: If the Xenon is not getting to the patient for single breath, on future studies lower the “Patient Air Flow” control to 10
or 20 for approximately five seconds before Xenon administration. Instruct the patient to exhale and add the Xenon while
the patient inhales.
12. Once the patient reaches equilibrium (one to two minutes, the counting rate on the camera stabilizes), switch to “Washout,”
position #3. Take washout data on the camera (typical framing: first picture, 15 seconds; second, 30 seconds; third, 60 sec-
onds). Have the patient breathe normally.
13. Carefully watch the “From Patient” bag. If it starts blowing up, the patient is breathing too fast. Advise normalized breathing
and increase the “Patient Air Flow” speed. If the bag continues to expand up towards the glass, the patient will feel back
pressure and resistance. To relieve this effect, increase “Trap Air Flow” by turning the Trap Flow knob clockwise until the
breathing bag deflates. Return the control to approximately one-half of its range when the study is complete. The use of this
trap motor control will be a rare occurrence. Do not adjust unless absolutely necessary and be sure to return it to its original
position. To be effective, the increase in motor speed must be accomplished before the bag is full, thus, it is vital to watch
the “From Patient” bag carefully during washout.
NOTE: If the motors are running too fast it may be difficult for the patient to breath in.
14. When the washout is complete, remove the patient from the system. Allow the system to run for a few more seconds or
until both bags are empty.
-7- PERFORMING A STUDY
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