7.6
Anesthesia and Scavenging
HPS
®
Other Considerations
During setup, be careful not to get liquid anesthetic into the copper block•
vaporizer or the 18-inch stainless steel needle. This could lead to premature
vaporization and unrealistic alveolar anesthetic vapor concentrations.
If, upon patient startup, abnormally high alveolar anesthetic concentrations are•
observed (e.g., greater than 1.0% displayed in the Alveolar Anesthetic Agents
on the HUD), stop the simulation, shut down the software and turn the HPS
Lab Rack off. Wait 10 seconds. Power the HPS Lab Rack on. Restart the HPS
software as normal, opening the stainless steel stopcock after lung calibration
and just prior to starting a patient simulation. If the problem persists, remove
the glass syringe from the pump and disconnect it from the needle with the
stopcock closed. Run Standard Man for a few minutes, until the alveolar gas
concentrations of the volatile agent return to zero. These methods should resolve
the problem.
6 mL of liquid anesthetic provides for about 30 minutes of wash-in at an inspired•
fraction of 1%, plus 30 minutes of wash-out at an inspired fraction of 0%.
METI recommends using Standard Man for low-flow anesthesia simulation.•
Scavenging
In order to accomplish the direct exchange of anesthetic vapors in the HPS lung, a
sample of the alveolar gases is continually flowing from the HPS mannequin to the HPS
Lab Rack. The gases are then exhausted from the HPS system and must be scavenged.
A scavenging port is located on the rear panel of the HPS Lab Rack for this purpose. In
order to scavenge HPS exhaust gases:
Locate the Scavenging fitting and tubing included with the HPS system.
1.
Connect the fitting to the scavenging port on the rear panel of the HPS2.
equipment rack.
Connect the scavenging tubing to the scavenging equipment in your simulation
3.
center. Contact METI or the Biomedical Engineering Department at your
institution for assistance locating the proper adapters to connect the supplied
tubing to the particular scavenging equipment used in your facility.
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