Physics & Chemistry: Practice Exam Questions

Physics and Chemistry: Practice Test Questions

More likely to result in rapid induction by a volatile agent:
1. if the agent is highly blood soluble
2. if the agent is sparingly blood soluble
Concerning tension, partial pressure and fractional volume
1. tension may be defined in Torr
2. partial pressure may be defined in kPa
3. Fractional volume is a ratio between partial pressure of the anesthetic relative to the barometric pressure
Agent with the highest brain:blood partition coefficient
1. sevoflurane
2. halothane
3. desflurane
4. isoflurane
lowest fat:blood partition coefficient
1. halothane
2. enflurane
3. nitrous oxide
4. sevoflurane
5. desflurane
definition of the time constant used in relating inspired gas fraction (FI) to fresh gas outlet fraction (FGO)
1. minute ventilation
2. blood solubility
3. capacity of the breathing circuit divided by the fresh gas flow
4. none of the above
highest FA/FI ratio after about 20 min. of administration
1. halothane
2. sevoflurane
3. desflurane
4. nitrous oxide
5. isoflurane
lowest FA/FI ratio after about 20 min. of administration
1. nitrous oxide
2. halothane
3. desflurane
4. sevoflurane
If the elapsed time is equal to the time constant, what percentage of the theoretical maximal value will be reached?
1. about 50%
2. about 60%
3. about 75%
4. about 95%
5. about 99%
Total lung capacity in mls (male)
1. about 3200
2. about 6000
3. about 1200
4. about 500
5. about 4800
Approximate tidal voluume for normal young adult (mls)
1. 1800
2. 500
3. 2400
4. 4800
5. 3200
Definition: functional reserve capacity
1. amount of gas left in the lungs after maximum exhalation
2. amount of gas left in the lungs after normal (unforced) exhalation
3. maximum volume of gas that can be forcefully exhaled
Factor(s) likely to increase the FA with time:
1. higher FRC
2. higher minute ventilation
3. both
4. neither
Assuming a blood:gas partition coefficient of 2.4, what is the percentage of inhalational agent transferred to the blood from the alveolar volume in a single breath hold?
1. 50%
2. 29%
3. 70%
4. 95%
5. 99%
Relating partial pressures, fractional anesthetic concentration, barometric pressure
1. FA = PB/PA
2. PB = FA/PA
3. FA= PA x PB
4. PA = FA x PB
Decreased rate of rise of FA/FI
1. high blood anesthetic solubility
2. lower blood anesthetic solubility
Consider 1 respiratory cycle: initial volatile agent concentration = 3.4% and nitrous oxide concentration is 72%. Assuming 50% nitrous oxide uptake and no uptake of the volatile agent, what is the volatile agent alveolar concentration due to the second gas effect?
1. 3.2%
2. 6.5%
3. 1%
4. 5.3%
5. 1.5%
lower rate of FA/FI rise
1. 10% nitrous oxide
2. 70% nitrous oxide
3. both the same rate of rise
Generally, for volatile anesthetic agents the rate of rise of FA/FI is typically fairly rapid
1. true
2. false
Cardiac output and rate of FA/FI rise: choose slowest rate of FA/FI rise among these cardiac output values:
1. 2 L/min
2. 7 L/min
3. 13 L/min
More likely to show differences in FA/FI upon concurrent doubling of both ventilation rate and cardiac output
1. isoflurane
2. nitrous oxide