Anesthesia Machine basics Flashcards
What would delivering anesthetic gas in air (21% O2) lead to
Hypoxemia
d/t hypoventilation & V/Q mismatch induced by anesthetics themselves
What is the minimum acceptable % O2 in people & SA
30-35% (FiO2 0.3.-0.35)
What is the metabolic requirement for oxygen
5-10 mL/kg/min
minimum O2 flow required
How is an E cylinder attached to anesthesia machine
directly via yoke
How is cylinder pressure measured
PSI (pounds per square inch)
How is breathing system pressure measured
cmH2O (centimeters water)
What is breathing system
pressure in pt lungs
What is the capacity of E cylinder
660 L
What is the capacity of H cylinder
6600 L
how to calculate remaining O2 in cylinder
660L/2200psi = X L/psi left on E tank
how to calculate minutes O2 remaining
minutes = X L/Flow L/min
It is possible to calculate the amount of N2O gas remaining in a tank T or F
False
N2O exist in both a gas & liquid form in tank
gauge only reads gas pressure
if any liquid N2O remains gauge not accurate
What is DISS
diameter index safety system
non-interchangeable gas specific threaded connection system
What does regulator do
decr cylinder pressure to 50 psi (safe working pressure)
Where is flow read on flowmeter
middle of ball
top of bobbin
What is the gas delivery rate from the quick flush
35-75 L/min directly to pt circuit
What comes from quick flush
Pure O2 that has bypassed the vaporizer
What should be done before O2 flush valve is utilized
Pt should be disconnected from the circuit
Possible complication of quick flush use
Pneumothorax
What is the amount of anesthetic coming from vaporizer called
volumes percent
What is vapor
gaseous state of substance that is liquid at ambient temp & pressure (760mmHg & 20C)
Halothane, Iso, Sevo, Desflurane
What is gas
exists in gaseous state at ambient T & P
N2O, Xenon
Define vapor pressure
pressure exerted by vapor molecules when liquid & vapor phases are in equilibrium
increases w/ temp increase
define saturated vapor pressure
vapor maximum administration percentage
modern vaporizers work by what method
specific concentration is created by variable bypass system, where fresh gas flows over a reservoir of liquid anes & mixes w/ carrier gas
what type of vaporizers are modern vaporizers
out of circuit (VOC)
what is a precision vaporizer
the anesthetic % is known
vaporizers in circuit aka ____
non precision
cannot produce known anesthetic %
Not currently recommended
what must happen to vaporizer before transportin
must be emptied
cannot be tipped
what is common gas outlet
where gas exits vaporizer
connected by hose to fresh gas inlet
