Term
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Definition
| Gaseous phase of a substance that is a liquid at room temperature |
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Definition
| Require that vaporizers are located in the fresh gas circuit and be concentration calibrated |
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Definition
| Pressure that the gaseous molecules exert on the container walls |
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Definition
| Contains all the vapor pressure it can hold at that temperature |
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Term
Saturated Vapor Pressure
(SVP) |
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Definition
| Pressure from the vapor when the gas phase is saturated will all the vapor it can hold at that temperature |
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Term
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Definition
| Temperature at which the vapor pressure equals atmospheric pressure |
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Term
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Definition
| Expressed as an absolute pressure (mmHg) or as a volumes percent |
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Term
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Definition
| Pressure exerted by a mixture of gases is equal to the sum of the pressure that each gas would exert |
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Term
| Latent Heat of Vaporization |
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Definition
The heat required to convert 1 g of liquid into vapor
(Vaporizers draw heat for the surroundings) |
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Term
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Definition
| The quantity of heat required to raise 1 g of a substance 1 C° |
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Term
| Materials with a High Specific Heat |
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Definition
Temperature changes are more gradual
(harder to heat something with a high specific heat) |
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Term
| Minimum Alveolar Concentration |
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Definition
| The concentration of anesthetic that produces immobility in 50% of patients undergoing a standard surgical incision |
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Term
| Expressing MAC as a partial pressure |
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Definition
Allows it to be indepedent from changes in atmospheric pressure
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Definition
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Definition
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Term
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Definition
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Term
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Definition
Use Variable Bypass Design
Gas is split between the bypass and vaporization chambers |
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Term
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Definition
| Use of seperate flow meter to the vaporizer from which vapor emerges at its SVP |
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Term
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Definition
| Function of the agent's vapor pressure divided by atmospheric pressure |
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Term
| Addition of Vapor to inflow |
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Definition
| Results in an increase in the total volume exiting the vaporizing chamber |
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Definition
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Definition
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Term
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Definition
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Term
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Definition
| Toxic concentration can be achieved by putting a high-vapor-pressure agent into a vaporizer designed for a low-vapor-pressure agent |
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Term
| As the Agent is vaporized |
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Definition
Cools down
Automatice Compensation is necessary |
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Term
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Definition
| Gas filled bellows or a bi-metallic strip valves |
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Term
| Uptake of N2O by a Liquid Agent |
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Definition
Transiently affects vaporizer output
Lowers vapor pressure |
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Term
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Definition
| Dissolves at about 4.5mls/cc of agent |
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Term
| MAC and Barometric Pressure |
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Definition
Always solve for P.P
Decreased barometric pressure causes a bigger MAC--> therefore takes more drug to get the people asleep
Actual clinical effect of changes in barometric pressure is very small |
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Term
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Definition
Contemporary vaporizers use interlock systems to prevent more than one vaporizer from being turned on at a time, thus preventing lethal concentrations
Vaporizers with the lowest vapor pressure are placed upstream |
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Term
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Definition
| One mole of gas occupies 22.4 L |
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Term
| Specific Gravity of Isoflurane |
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Definition
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Term
| Molecular Weight of Isoflurane |
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Definition
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Term
| 1 cc of Isoflurane Liquid |
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Definition
| 182 cc of Isoflurane gas @ STP |
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Term
| Very Large Fresh Gas Flows |
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Definition
| Can Cause vaporizer cooling and reduce output |
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Term
| Extreme Heating of the Vaporizer |
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Definition
| Can result in lethal concentrations of anesthetic especially if boiling occurs |
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Term
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Definition
Intermittent back pressure on the vaporizer
Moves gas in retrograde fashion into the bypass chamber
This occurs greatest at low flow rates and with small amounts of liquid in vaporizer |
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Term
Modern Vaporizers
(Retrograde Flow)
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Definition
| Use a unidirectional valve or baffles to prevent retrograde flow and minimizes the pumping effect |
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Term
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Definition
| Extremely volatile with a SVP of 690 mmHg @ 20°C |
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Term
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Definition
Do not use variable bypass mechanism
Heats agent to 39°C to produce 1500 mmHg |
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Term
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Definition
| The rate of fresh gas flow is deterined by passing the gas flow through a resistance and measuring back pressure that determines the des gas intoduced to the flow |
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Term
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Definition
| Causes a change in viscosity of the carrier gas and a slight fall in the desflurane vaporizer output |
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