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30 Cards in this Set

  • Front
  • Back
FGF
fresh gas flow
SVP
saturated vapor pressure
the vaporization chamber is designed so that the gas leaving it is always...
fully saturated
design modifications that ensure agent saturation of gas leaving vaporization chamber
baffles
wicks
bubbling through
desired concentration is obtained by adjusting...
the percentage control dial
vapor concentration supplied by the vaporizer is (independent of/dependent on) FGF
independent of FGF btwn 0.5 and 15 L/min
amoutn of vapor carried by the FGF is a function of...
SVP of agent
atmospheric pressure
SVP is dependent on...
agent
temperature
% vapor in mixture is not directly relevant, anesthetic effect is determined by...
partial pressure in the alveoli
temperature at which vapor pressure becomes equal to ambient (atmospheric) pressure
boiling point
as altitude increases, boiling point...
decreases
Why does boiling point decrease w/ increasing altitude?
ambient pressure decreases
anesthetic vapor may be quantified in two ways...
absolute pressure (mmHg)
volume percent
formula relating absolute pressure and volume percent
vol % = absolute pressure of agent/ambient pressure X 100
SVP for water @37C
47 mmHg
halothane MAC
0.75%
5.7 mmHg
enflurane MAC
1.68%
12.8 mmHg
isoflurane MAC
1.15%
8.7 mmHg
methoxyflurane MAC
0.16%
1.2 mmHg
sevoflurane MAC
1.7%
12.9 mmHg
desflurane MAC 31-65yo
6.0%
45.6 mmHg
desflurane MAC 18-30yo
7.25%
55.1 mmHg
halothane SVP 20C
243 mmHg
isoflurane SVP 20C
238 mmHg
sevoflurane SVP 20C
160 mmHg
desflurane SVP 20C
664 mmHg
enflurane SVP 20C
175 mmHg
formula for vol% saturated isoflurane at 2 atm
%iso = SVP/2 atm
%iso = 238/2X760
%iso = 15.7%
total vol. exiting vaporization chamber is (less/greater) than that entering
greater than due to presence of vapor
SVP/Ptotal = agent vol/?
carrier vol + agent vol