Anesthesia Machine Flashcards
What is the minimum acceptable Oxygen percentage for people and small animals?
30-35% O2
What is the metabolic requirement for oxygen?
5-10 mL/kg/min
What is the minimum O2 flow required?
5-10mL/kg/min
What are the medical gases?
Oxygen
Nitrous oxide
Medical Air
What are the different types of cylinders?
E
H
What is an E cylinder?
a single cynlinder attached directly to anesthesia machine via yoke
What is an H cylinder?
supply for central O2
What are the oxygen sources?
Cylinders
Liquid (Cryogenic oxygen)
Oxygen concentrator
What is the color of an oxygen tank?
Green
What is the color of a Nitrous oxide tank?
Blue
What is the color of a Medical air tank?
Yellow
What is the measurement for the Cylinder pressure?
PSI
What is the measurement for the Breathing System pressure?
cmH2O
What is the capacity of the E cylinder?
660L
How do you calculate the remaining O2?
2200psi/660L = psi left on E tank/ X Liters
What is the purpose of a Regulator?
Decreases tank pressure to a safe working pressure
Flowmeter
Controls rate of gas flow through the vaporizer
Where do you read the flow on a flowmeter?
Middle of the Ball
Top of the Bobbin
Vapor
Gaseous state of substance that is liquid at ambient temp and pressure
Gas
exists in gaseous state at ambient T and P
Vapor Pressure
Pressure exerted by vapor molecules when liquid and vapor phases are in equilibrium
Saturated Vapor pressure
Vapors have a maximum administration percentage
Characteristics of Modern Vaporizers:
Agent Specific Concentration-Calibrated Variable bypass Flow-over Out-of-Circuit High Resistance Compensated for temperature, flow, and back-pressure
Variable-bypass system
fresh gas flows over a reservoir of liquid anesthetic and mixes with carrier gas
Characteristics of a nonprecision VIC vaporizer:
In circuit Increased surface area for vaporization Cannot produce a known anesthetic % Not temperature compensated Not currently recommended
Characteristics of Modern vaporizers:
Temperature is compensated for
Flow rate: 0.5-10L/min