Quiz 3 Flashcards
(53 cards)
What is vapor pressure?
in enclosed space at a constant temperature, with a volatile liquid, there will be an equilibrium between vapor and liquid below vapor- # of molecules exiting liquid for gas phase equals number of molecules returning to the liquid phase
Do you want a vaporizer to have high or low thermal conductivity?
high- will minimize temp changes that occur with vaporization to achieve constant flow of gas
Describe variable bypass vaporizers and where it is located
splits gas into the vaporizer (above and through the liquid agent); outside circle system
Which gas uses an electronic vaporizer and why?
des- has a high vapor pressure
How does the electronic vaporizer work?
injects known amount of liquid anesthetic into known volume of gas
What is the electronic vaporizer called?
Tec 6
What does the bimetallic strip do?
bends depending on temp to alter splitting ratio (sends more flow into vaporizer if cold)
What is the electronic vaporizer called, and what are its two characteristics?
Tec 6- heated and pressurized
What way do the control knobs move on the vaporizers?
counter-clockwise
What does the wick do in vaporizers?
gives the air more time to come up to desired concentration of agents
In the Tec 6, what temp is the gas heated to and pressurized at?
39 C, 1300 mmHg (or 2atm)
Will the partial pressure decrease with altitude in the Tec 6?
yes- does not compensate
What does the interlock system do?
prevents more than one agent being used at a time
The Tec 6 is a ? circuit
dual
What is the T setting on the vaporizers?
transport setting- prevents liquid from getting into the chamber (must use a new one if it does this)
What happens if you put sevo in an iso vaporizer?
You get a lower output (sevo has a lower VP than iso)
What would happen if you put iso in a sevo vaporizer?
You would get a higher output (iso has higher VP than sevo)
What would happen if you put halothane in an iso vaporizer?
nothing- similar VP
Describe laminar flow and what is the primary factor?
smooth, orderly, parallel to walls; flow fastest in the center; viscosity
Describe turbulent flow and what is the primary factor?
flow lines are not parallel; density
What are 3 things that change flow from laminar to turbulent?
change in gas direction >20 degrees, increased velocity, corrugated tubes
Reynolds number values
<2000- laminar >4000- turbulent
Mapleson circuits for spontaneous breathing in order of efficiency
ADCB (all dogs can bite) *D includes E, F, Bain’s
Mapleson circuits for mechanical ventilation in order of efficiency
DBCA (dead bodies can’t argue) *D includes E, F, Bain’s
