Anesthesia Lab Final Flashcards
What would delivering anesthetic gas in air (21%O2) lead to in the patient? Why?
Hypoxemia due to hypoventilation & V/Q mismatch induced by anesthetics themselves
What is the minimum acceptable % of O2 delivered for people & small animals?
30-35% (FiO2 = 0.30-0.35)
what is the metabolic requirement for oxygen?
What is the minimum O2 flow required?
5-10mL/kg/min
This would be the minimum O2 flow required!
how are E cylinders usually attached to anesthesia machine?
directly via a yoke
How is cylinder pressure usually measured
PSI (pounds per square inch)
How is breathing system pressure measured?
cmH2O (centimeters water)
Where is the low pressure in an anesthetic machine system?
between flowmeter output & common gas outlet
What is considered the breathing system pressure
the pressure in patients’ lungs
What is the capacity of E cylinder?
660 L
What is the capacity of H cylinder?
6600 L
What are both the E & H cylinder filled to a pressure of?
2200 psi
How to calculate remaining O2 in a tank?
Minutes remaining?
What is DISS
Diameter index safety system
Non-interchangeable gas-specific threaded connection system
What is a regulator
AKA prssure-reducing valve
decreases tank pressure to a safe working pressure (approx. 50 psi) which is supplied to flowmeter
Where do you read the flow in a flowmeter
MIddle of ball
Top of bobbin
Where should O2 flowmeter be when there are multiple flowmeters?
On far right (downstream of all other gases) to prevent delivery of a hypoxic gas mixture
At what rate does the quick flush deliver gas when used?
Between 35-75 L/min directly to patient circuit
When is it appropriate to use the quick flush?
What type of gas mix will be flushed?
What precaution must be taken if quick flush is to be used?
To quickly decrease anesthetic gas % in the circuit
No mix! this is pure O2 that has bypassed the vaporizer
Patient should be disconnected from the circuit temporarily before the O2 flush valve is utilized
What is a possible complication of use of the quick flush?
Barotrauma = PNEUMOTHORAX
What do anesthetic vaporizers do
Deliver selected % of anesthetic vapor to fresh (common) gas outlet
“volumes percent”
What is vapor pressure
pressure exerted by vapor molecules when liquid & vapor phases are in equilibrium
What is saturated vapor pressure
maximum administration percentage of a vapor
How do vaporizers work
a specific concentration is created by variable-bypass system, where fresh gas flows over a reservoir of liqui anesthetic & mixes with carrier gas
What is a common feature of all modern vaporizers?
What type is it if the anesthetic % is known?
They are out-of-circuit (VOC)
precision vaporizer
