anaesthetic machine prac Flashcards
(23 cards)
why is nitrous oxide delivered with oxygen?
to prevent hypoxia
When you have “piped-in” oxygen in you hospital it is imperative to do what at the end of each anaesthetic period?
a. Leave the flow meter running to ensure all inhalant is flushed from the anaesthetic circuit
b. Flush the circuit and leave the machine plugged in for the next person
c. Disconnect the anaesthetic machine from the oxygen outlet
d. Disconnect the anaesthetic circuit and bag and refill the vaporiser
c. Disconnect the anaesthetic machine for the oxygen outlet
What is the international colour for OXYGEN?
a. clear
b. white
c. pink
d. blue
e. green
f. black
g. yellow
b. white (green in the states)
What is the international colour for NITROUS OXIDE?
a. clear
b. white
c. pink
d. blue
e. green
f. black
g. yellow
d. blue - blue in the states as well
In New Zealand, oxygen cylinders are typically filled to what psi?
2200 psi (~15,000 kPa)
what is the yoke on an anaesthetic machine?
the part that connects the gas cylinders to the machine
what pressure gauge response would you see with a gas stored as a liquid (eg nitrous oxide?)
a. pressure remains constant until all liquid is used, then drops rapidly
b. pressure is directly proportional to the volume remaining
a. pressure remains constant until all liquid is used, then drops rapidly
what pressure gauge response would you see with a gas like oxygen that’s stored as a gas (instead of a liquid like nitrous oxide)
a. pressure remains constant until all liquid is used, then drops rapidly
b. pressure is directly proportional to the volume remaining
b. pressure is directly proportional to the volume remaining
On the image to the right, which line best represents the position the needle of the pressure gauge would be in if the OXYGEN cylinder were full?
B - a full oxygen tank is 2200 psi, which is 15,000 KPa
Fill in the blank: ______ is an oxidising agent that can increase the risk of combustion in an anaesthetic setting.
a. Oxygen
b. Nitrous Oxide
a. Oxygen
True or False: Excessive nitrous oxide delivery can reduce the inspired oxygen concentration.
a. False
b. True
b. True - as nitrous oxide is a gas, under the right circumstances it has the ability to displace all other gases leaving it as the sole inspired gas
Where do you read the ball float from?
a. Top
b. Middle
c. Bottom
b. Middle
Where do you read the bobbin float from?
a. Top
b. Middle
c. Bottom
a. Top
what does VOC stand for?
vaporiser out of circuit, eg for precision vaporiser location
what does VIC stand for?
vaporiser in circuit, eg for a non precision vaporiser location
what does SPV stand for?
saturated vapour pressure - how easily an anaesthetic agent evaporates at a given temperature
what does FGO stand for?
the Fresh Gas Outlet (also called the common gas outlet/CGO, or accessory common gas outlet/ACGO) - where the fresh gas exits the machine and enters the breathing circuit
Before performing an anaesthetic machine check (also called a high-pressure test), ensure the machine is properly set up. what three steps are needed here?
- check the oxygen supply
- inspect the flow meter
- check the vaporiser
what are the four steps involved in an anaesthetic machine check?
Step 1. Identify the FGO (and disconnect the breathing system)
Step 2. Set the flow meter at 1L/min (allow this to stabilise)
Step 3. Occlude the FGO with your thumb
Step 4. Observe the float drop to 500mL/min (over 10-20 sec)
- we do this to check for leaks of oxygen or inhalational agents
What is the name of the safety system incorporated into the yoke of the machine and cylinder valve, that prevents the accidental attachment of the wrong cylinder to the anaesthetic machine?
a. Chicken and egg system
b. Colour coding system
c. Diameter index safety system
d. Pin index safety system
d. Pin index safety system
What is the approximate pressure of full oxygen cylinder in NZ?
a. 220 kPa
b. 1500 kPa
c. 2200 kPa
d. 15,000 kPa
d. 15,000 kPa (or 2200 PSI)
Which of the following is NOT a function of the pressure regulator?
a. Regulates pressure
b. Adds water vapor to the delivery gas
c. Reduces pressure from high to lower (safer) pressure
d. Changes pressure to a consistent pressure no matter what the cylinder pressure is
b. Adds water vapor to the delivery gas
pressure gauge in PSI - which line best represents the position the needle would be in if the OXYGEN cylinder were full?
C - remember, 2200 PSI or 15,000 kPa
