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