Anesthesia Machine Tasks

Question 1

What are the units for the O2 tank pressure gauge?

Answer 1

PSI - pounds per square inch

Question 2

What are the units for the pressure manometer?

Answer 2

CM H2O - centimeters water

Question 3

What is the maximum O2 pressure in a full tank?

Answer 3

2000 PSI

2200 PSI

Question 4

When should an in-use O2 tank be replaced with a new tank?

Answer 4

When the pressure in the tank is below 500 PSI before starting a short procedure, or 800 PSI for a longer procedure.

Question 5

Which part of the machine connects to the O2 tank?

Answer 5

the yoke, which includes the pressure reducing valve

Question 6

A small O2 tank is __________________________________ in color and is called an _________
Cylinder.

Answer 6

green, E

Question 7

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.

Answer 7

pressure reducing valve

Question 8

What is the purpose of the pressure reducing valve?

Answer 8

to reduce the pressure of oxygen coming out of the E cylinder to 50 PSI

Question 9

After flowing through the flowmeter and the vaporizer, the newly formed gas mixture then flows to the

________________________________ __________________ __________________________.

Answer 9

fresh gas outlet

Question 10

What is the pressure of this gas mixture at the fresh gas outlet?

Answer 10

15 PSI

Question 11

When using a rebreathing circuit (such as the F circuit), where does the gas mixture go from the fresh gas outlet?

Answer 11

inhalation unidirectional valve

Question 12

Where does the gas mixture go from the inhalation unidirectional valve?

Answer 12

the patient

Question 13

Describe the pathway of gas from the E cylinder of oxygen to the patient.

Answer 13

O2 tank -> pressure reducing valve -> flowmeter -> vaporizer -> fresh gas outlet -> inhalation unidirectional valve -> patient

Question 14

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?

Answer 14

every 15 minutes to re-inflate collapsed alveoli in the lungs

Question 15

Explain why some of the patient’s air sacs (alveoli in the lungs) collapse during gas anesthesia.

Answer 15

the patient is not breathing quickly and deeply enough to fully inflate all the alveoli

Question 16

When providing assisted PPV during gas anesthesia, the pressure on the pressure manometer should
not exceed _____________________________________?

Answer 16

15-20 cm H2O

Question 17

How often should the CO2 absorber granules be changed?

Answer 17

every 10 hours

Question 18

What else needs to be changed at the same time as the CO2 absorber granules?

Answer 18

fresh air canister

Question 19

During continuous flow anesthesia using a rebreathing setup, the pop off valve is always kept in the
open position except when ____________________________ the patient.

Answer 19

bagging

Question 20

Explain what happens if the pop off valve is inadvertently left in the closed position while running continuous flow anesthesia.

Answer 20

the rebreathing bag inflates until the patient is no longer able to inhale and exhale

Question 21

What is the main advantage of a rebreathing circuit?

Answer 21

the patient experiences less hypothermia and less gas is wasted

Question 22

How do rebreathing circuits connect to the machine?

Answer 22

the inhalation tube connects to the inhalation unidirectional valve and the exhalation tube connects to the exhalation unidirectional valve

Question 23

Describe the design of the F circuit.

Answer 23

the green inhalation tube is inside the clear exhalation tube

Question 24

What is the advantage of the F circuit design?

Answer 24

the inhaled gas is warmed by the exhaled gas, reducing hypothermia risk

Question 25

What is the advantage of using the nonrebreathing circuit?

Answer 25

it requires less energy from the patient

Question 26

What are the disadvantages of using a nonrebreathing circuit?

Answer 26

increased waste of gas, increased hypothermia risk for the patient

Question 27

When does a nonrebreathing circuit need to be used?

Answer 27

when the patient is smaller then 15 pounds

Question 28

How does a nonrebreathing circuit connect to the machine?

Answer 28

the inhalation tube connects to the inhalation unidirectional valve and the exhalation tube connects to the waste gas scavenger

Question 29

When bagging a patient that has stopped breathing, how many breaths should be given per minute until the patient starts breathing again?

Answer 29

12 per minute, given every 5 seconds and pausing occasionally to see if the patient has resumed breathing on its own

Question 30

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?

Answer 30

close the pop-off valve

Question 31

What is the 02 flush valve used for?

Answer 31

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

Question 32

When is the pop-off valve closed?

Answer 32

when testing the machine for leaks and bagging the patient