5 - Machines & Circuits (NO EXAM QUESTIONS FROM THIS)

Question 1

What are the 5 basic components of every anesthetic machine?

Answer 1

FROGS:

1. Flowmeter
2. Regulator
3. VapOrizer
4. Gas supply
5. Scavenging system

Question 2

What are the 2 types of breathing circuits?

Answer 2

Rebreathing and Non-rebreathing

Question 3

What are 2 names for rebreathing circuits?

Answer 3

Circle system, Universal F circuit

Question 4

What are the 2 components of a non-rebreathing circuit?

Answer 4

Bain circuit, Ayre’s T-piece

Question 5

What are the 5 key distinguishing features between rebreathing vs. non-rebreathing circuits?

Answer 5

1. Presence of one-way valves
2. Presence of CO₂ absorbent (sodasorb or sodalime)
3. Amount of resistance to breathing
4. Minimal required oxygen flow rate
5. Speed to change anesthetic depth

Question 6

What is the cut-off weight for a non-rebreathing circuit?

Answer 6

<7-10 kg

Question 7

What is the weight cut-off for a rebreathing system?

Answer 7

>7-10 kg

Question 8

How does a rebreathing system get rid of CO₂ in expired gases?

Answer 8

It is absorbed by the sodalime canister

Question 9

Rebreathing circuits require _____ O₂ flow rates.

Answer 9

lower

Question 10

Rebreathing circuits have _____ resistance to breathing.

Answer 10

high

Question 11

What are 2 reasons for using oxygen as part of anesthesia?

Answer 11

1. The patient needs it
2. Used as a carrier gas for the anesthetic

Question 12

You are always giving ___% oxygen, but giving it at different _____.

Answer 12

100%, rates