Final Flashcards
Vaporizers are included in this part of the gas distribution system?
Low pressure
List the vaporizer functions
–Change liquid anesthetic into vapor
–Deliver set dosage
–Deliver consistent concentration of agent vapor into anesthetic gas mixture
A __________ is an instrument designed to change a liquid anesthetic agent into its vapor and add a controlled amount of this vapor to the fresh gas flow
Vaporizer
What is the partial pressure of an agent in vapor phase?
Vapor pressure
The boiling point of a liquid is what?
The temperature at which vapor pressure equals atmospheric pressure
What is the amount of heat (calories) required to convert 1 g of liquid agent to a vapor?
Heat of vaporization
The speed at which heat flows through a substance is what?
Thermal conductivity
Vapor pressure is dependent on what 2 factors?
Temperature and liquid (substance)
True or False: Currently there are no ideal inhalational anesthetics
TRUE
For a blood/gas partition coefficient, the higher the number means ________
It is more potent because it wants to stay in the blood
For a oil/gas partition coeffecient, the _______ the number means more of the agent wants to stay in the tissue
higher
What is isoflurane’s VP, Blood/gas coefficient, and MAC values?
238 vp
- 36 blood/gas
- 15 MAC
What is sevoflurane VP, Blood/gas coefficient, and MAC values?
157 vp
- 6 blood/gas
- 05 MAC
What is desflurane VP, Blood/gas coefficient, and MAC values?
669 vp
0.45 blood/gas
6 MAC
Which anesthetic agent is the most potent?
Isoflurane
Which anesthetic agent is least potent?
Desflurane
T or F: More potent means the agent has slower onset and means slower it comes off
TRUE
What are the 2 effects of intermittent back pressure?
Pumping effect– increases vaporizer output
Pressuring effect– decreases vaporizer output
What is vaporizer formula?
Fa = Qv x Pa / (Pb - Pa) x Qt
What is percent of Isoflurane when fresh gas flow is 2L (Carrier gas flow is 100mL)
Pb= 760 Pa=240 Qt=2000 Qv= 100
Fa= 100 x 240 / (760-240) 2000
Fa= 0.023
2.3%
What device on vaporizer ensures that only one vaporizer can be used at a time.
vaporizer interlock
What are the 2 main purposes of the vaporizer manifold
–Provides places where vaporizers are mounted on the machine
–Provides passageway for fresh gas flow
The first vaporizer was?
Ether inhalation–rag soaked in ether and then placed over patients nose and mouth
Done by Dr. Crawford Long in 1842
T or F: Do you have to dilute a copper kettle?
TRUE