Ch. 15 Anesthesia Delivery Systems Flashcards
How are most anesthesia delivery systems powered?
electrically and pneumatically
What is the common gas outlet?
Where volatile anesthetics and medical gases (O2, air) join together to be delivered to the patient
What are two routes that exhaled gases may go?
scavenging system (waste) or through an absorbent
What does the fail-safe valve do?
prevents delivery of hypoxemic flows to patient (<30% O2) by proportionally decreasing the flow of other gases or shutting off completely
What does the fail-safe valve not prevent?
delivery of 100% N2O
Where is DISS located?
located on the wall where you connect hoses
Gases from the wall (central supply source) come in at what PSI?
~50
Where is PISS located?
the cylinder hanging yoke
What color is the carbon dioxide tank?
gray
Which gas cylinder’s pressure is proportional to it’s contents? Which is not?
O2; N2O
Why does the pressure in the N2O cylinder not change?
When N2O gas leaves, more from the liquid form vaporizes to fill the space and return the pressure to baseline
Volatile anesthetics are in what form at room temperature and pressure?
liquid
Which vaporizer is electrically heated?
desflurane
What does the interlock do?
prevents multiple vaporizers from being turned on at a given time
Why is oxygen preferred to drive the bellows instead of air?
if there is a leak in the bellows, the fraction of inspired oxygen will increase
