Anesthesia Machine Tasks Flashcards
What are the units for the O2 tank pressure gauge?
PSI - pounds per square inch
What are the units for the pressure manometer?
CM H2O - centimeters water
What is the maximum O2 pressure in a full tank?
2000 PSI
2200 PSI
When should an in-use O2 tank be replaced with a new tank?
When the pressure in the tank is below 500 PSI before starting a short procedure, or 800 PSI for a longer procedure.
Which part of the machine connects to the O2 tank?
the yoke, which includes the pressure reducing valve
A small O2 tank is __________________________________ in color and is called an _________
Cylinder.
green, E
When the O2 tank valve is in the open position and the flowmeter is also open, O2 flows through
the _____________________________ _____________________________ ____________________
before going to the flowmeter.
pressure reducing valve
What is the purpose of the pressure reducing valve?
to reduce the pressure of oxygen coming out of the E cylinder to 50 PSI
After flowing through the flowmeter and the vaporizer, the newly formed gas mixture then flows to the
________________________________ __________________ __________________________.
fresh gas outlet
What is the pressure of this gas mixture at the fresh gas outlet?
15 PSI
When using a rebreathing circuit (such as the F circuit), where does the gas mixture go from the fresh gas outlet?
inhalation unidirectional valve
Where does the gas mixture go from the inhalation unidirectional valve?
the patient
Describe the pathway of gas from the E cylinder of oxygen to the patient.
O2 tank -> pressure reducing valve -> flowmeter -> vaporizer -> fresh gas outlet -> inhalation unidirectional valve -> patient
When running anesthesia, the patient should be periodically “bagged” (given assisted positive pressure ventilation / abbreviated PPV) during the anesthetic procedure. Why this is needed? How often this should be done?
every 15 minutes to re-inflate collapsed alveoli in the lungs
Explain why some of the patient’s air sacs (alveoli in the lungs) collapse during gas anesthesia.
the patient is not breathing quickly and deeply enough to fully inflate all the alveoli
When providing assisted PPV during gas anesthesia, the pressure on the pressure manometer should
not exceed _____________________________________?
15-20 cm H2O
How often should the CO2 absorber granules be changed?
every 10 hours
What else needs to be changed at the same time as the CO2 absorber granules?
fresh air canister
During continuous flow anesthesia using a rebreathing setup, the pop off valve is always kept in the
open position except when ____________________________ the patient.
bagging
Explain what happens if the pop off valve is inadvertently left in the closed position while running continuous flow anesthesia.
the rebreathing bag inflates until the patient is no longer able to inhale and exhale
What is the main advantage of a rebreathing circuit?
the patient experiences less hypothermia and less gas is wasted
How do rebreathing circuits connect to the machine?
the inhalation tube connects to the inhalation unidirectional valve and the exhalation tube connects to the exhalation unidirectional valve
Describe the design of the F circuit.
the green inhalation tube is inside the clear exhalation tube
What is the advantage of the F circuit design?
the inhaled gas is warmed by the exhaled gas, reducing hypothermia risk
What is the advantage of using the nonrebreathing circuit?
it requires less energy from the patient
What are the disadvantages of using a nonrebreathing circuit?
increased waste of gas, increased hypothermia risk for the patient
When does a nonrebreathing circuit need to be used?
when the patient is smaller then 15 pounds
How does a nonrebreathing circuit connect to the machine?
the inhalation tube connects to the inhalation unidirectional valve and the exhalation tube connects to the waste gas scavenger
When bagging a patient that has stopped breathing, how many breaths should be given per minute until the patient starts breathing again?
12 per minute, given every 5 seconds and pausing occasionally to see if the patient has resumed breathing on its own
In addition to using the O2 flush valve to flush the anesthetic gas out of the rebreathing bag, what needs to be done before you can start bagging your patient?
close the pop-off valve
What is the 02 flush valve used for?
to flush all the anesthetic gas out of the rebreathing bag before bagging the patient, or to flush the anesthetic gas out of the breathing circuit at the end of the procedure
When is the pop-off valve closed?
when testing the machine for leaks and bagging the patient
