NUR 970 Exam Two - Inhalation Agents
UPDATED Exam Questions and
CORRECT Answers
Nitrous oxide is a ___ gas which makes it useful as an inhalation ___ in settings like ____ -
CORRECT ANSWER - sweet-smelling
adjunct
dentistry
Gases that are pungent are ___ and may be ___ to the airway, causing pts to ___ or worse,
develop ____ - CORRECT ANSWER - difficult to inhale
irritating
cough
laryngospasms
is N2O flammable? explosive? - CORRECT ANSWER - no and no, but it can sustain a fire
t/f: nitrous oxide is the least potent inhalation anesthetic, but it can still reach 1 MAC -
CORRECT ANSWER - false. it IS the least potent, but it can never reach 1 MAC
N2O is largely ___ in blood with a BGC of ___. This accounts for its ___ onset and offset -
CORRECT ANSWER - insoluble
.47
rapid
What two effects make N2O extremely useful? - CORRECT ANSWER - second gas effect
additive effect
, Explain the additive effect - CORRECT ANSWER - N2O reduces the MAC % requirements
for sevo, iso, and des when they are used together. recall the MAC values are about half when
N2O is given concurrently at 70%
Explain how N2O can lead to diffusion hypoxia on emergence - CORRECT ANSWER - due
to its blood insolubility, it leaves the very quickly and enters the alveoli on emergence. it
overwhelms the o2 in the alveoli which may fall below 21%
How can anesthetists avoid diffusion hypoxia from N2O on emergence? - CORRECT
ANSWER - increase the FiO2
How are nitrous tanks filled? (2) - CORRECT ANSWER - 90% liquid nitrous
above the liquid is N2O vapor/gas
How much gaseous N2O will a full e-cylinder produce at 1 atm? - CORRECT ANSWER -
1590L
As long as the liquid nitrous remains in the tank and the temp is stable at ___ C, the pressure in
the tank will always be ___ - CORRECT ANSWER - 20C
745 psig
When does boyle's law apply to N2O tanks? - CORRECT ANSWER - when all the liquid in
the tank is gone
When there is only gas left in the N2O cylinder and the psig reads 745, how much gas is left? -
CORRECT ANSWER - about 5 liters
How can you tell how much nitrous is left in a tank? - CORRECT ANSWER - feel it. the
portion of the tank with liquid still in it will be cold to the touch, while the portion with gas will
feel room temp
UPDATED Exam Questions and
CORRECT Answers
Nitrous oxide is a ___ gas which makes it useful as an inhalation ___ in settings like ____ -
CORRECT ANSWER - sweet-smelling
adjunct
dentistry
Gases that are pungent are ___ and may be ___ to the airway, causing pts to ___ or worse,
develop ____ - CORRECT ANSWER - difficult to inhale
irritating
cough
laryngospasms
is N2O flammable? explosive? - CORRECT ANSWER - no and no, but it can sustain a fire
t/f: nitrous oxide is the least potent inhalation anesthetic, but it can still reach 1 MAC -
CORRECT ANSWER - false. it IS the least potent, but it can never reach 1 MAC
N2O is largely ___ in blood with a BGC of ___. This accounts for its ___ onset and offset -
CORRECT ANSWER - insoluble
.47
rapid
What two effects make N2O extremely useful? - CORRECT ANSWER - second gas effect
additive effect
, Explain the additive effect - CORRECT ANSWER - N2O reduces the MAC % requirements
for sevo, iso, and des when they are used together. recall the MAC values are about half when
N2O is given concurrently at 70%
Explain how N2O can lead to diffusion hypoxia on emergence - CORRECT ANSWER - due
to its blood insolubility, it leaves the very quickly and enters the alveoli on emergence. it
overwhelms the o2 in the alveoli which may fall below 21%
How can anesthetists avoid diffusion hypoxia from N2O on emergence? - CORRECT
ANSWER - increase the FiO2
How are nitrous tanks filled? (2) - CORRECT ANSWER - 90% liquid nitrous
above the liquid is N2O vapor/gas
How much gaseous N2O will a full e-cylinder produce at 1 atm? - CORRECT ANSWER -
1590L
As long as the liquid nitrous remains in the tank and the temp is stable at ___ C, the pressure in
the tank will always be ___ - CORRECT ANSWER - 20C
745 psig
When does boyle's law apply to N2O tanks? - CORRECT ANSWER - when all the liquid in
the tank is gone
When there is only gas left in the N2O cylinder and the psig reads 745, how much gas is left? -
CORRECT ANSWER - about 5 liters
How can you tell how much nitrous is left in a tank? - CORRECT ANSWER - feel it. the
portion of the tank with liquid still in it will be cold to the touch, while the portion with gas will
feel room temp
