Anesthesia Equipment Chapter 6 Flashcards
end of chapter questions
Which factors will cause a shift from the liquid to the vapor phase?
heating the vaporizer
increasing the flow through the vaporizer
Which statements concerning boiling point are true?
A. boilingpoint is independent of the atmospheric pressure
B. boiling points for commonly used VAA vary between 48 - 59 degrees C at 760 torr
C. anesthetic agents with high boiling points are more susceptible to variations in barometric pressure than agents with lower boiling points
D. atmospheric pressure and the vapor pressure of an agent are equal at the boiling point
B and D
B. boiling points for commonly used VAA vary between 48 - 59 degrees C at 760 torr
D. atmospheric pressure and the vapor pressure of an agent are equal at the boiling point
The concentration of a volatile anesthetic may be expressed as:
volumes percent
the number of units of the vapor in relation to a total of 100 units
the partial pressure
the pressure of the vapor in relationship to the total pressure exerted by all of the gases in the sample
Which of the following accurately reflects the heat of vaporization?
it is expressed as calories per gram
Which of the following accurately reflect specific heat?
A. it is the amount of heat needed to raise the temp of a substance by 1 degree F
B. the higher the specific heat, the more heat that is required to raise the temp of a quantity of a substance
C. it is the heat required to raise 1 milliliter of a substance by 1 degree F
D. substances with high specific heats are preferred when choosing the material from which to construct a vaporizer
B and D
B. the higher the specific heat, the more heat that is required to raise the temp of a quantity of a substance
D. substances with high specific heats are preferred when choosing the material from which to construct a vaporizer
Most concentration-calibrated vaporizers:
are calibrated in volumes percent
Methods used by vaporizers to vaporize agents include:
flow over
injection into a known volume of gas
Thermal compensation in a vaporizer is accomplished by:
supplying heat to the vaporizer
altering the flow through the vaporizing chamber
How do changes in back pressure affect the output of a vaporizer?
the pumping effect will increase vaporizer output
a check valve at the machine outlet is not an effective solution to the pumping effect
the pressurizing effect will decrease vaporizer output
the pumping effect is greater with low fresh gas flows, large pressure fluctuations, and low vaporizer settings
Acceptable locations for a vaporizer on the anesthesia machine include:
A. between the check valve and the common gas outlet
B. between the common gas outlet and the breathing system
C. between the oxygen flush and the breathing system
D. between the flowmeters and the machine outlet
D. between the flowmeters and the machine outlet
Advantages of having detachable vaporizers include:
a more compact machine is possible
easy removal if vaporizer failure occurs
complete removal during malignant hyperthermia
If an agent of low potency or volatility were placed in a vaporizer for agents of high volatility and potency,
A. a mixture of agents will likely be delivered
B. the vapor output will be higher than the scale reading
C. the vaporizer output will be lower than the reading on the dial
D. the mixture can be determined by smelling the agents in the fresh gas flow
A and C
A. a mixture of agents will likely be delivered
C. the vaporizer output will be lower than the reading on the dial
Actions that could cause a vaporizer to be overfilled include:
loosening the connection between the agent bottle and the filling device
tipping the vaporizer
turning the control dial on the vaporizer ON
A vaporizer located downstream of the common gas outlet:
may be installed backward
presents significant resistance to gas flow
may deliver a high concentration into the breathing system
