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Flashcards in vaporizers Deck (43):
1

Functions of a vaporizer

Change liquid anesthetic agent into vapor Deliver set dosage Deliver consistent concentration of agent vapor into anesthetic gas mixture

2

how is vapor pressure created in the vaporizer?

gas molecules bombard the walls of the container

3

what plays a major role in vapor pressure

temperature, the higher the temp the greather the vapor pressure

4

what happens if the vaporizer does not keep a constant temperature

vapor pressure drops and agent becomes liquid again

5

what is pressure when there is a dynamic equilibrium between the liquid & vapor phases when the temperature of the container is kept constant

saturated vapor pressure

6

what is equilibrium?

when the molecules in each phase remain constant

7

what is Temperature at which vapor pressure equals atmospheric pressure

boiling point

8

Part of total pressure from 1 gas in a mix

Partial pressure note: expresses the absolute value of gas molecules in a mixture

9

what is volume percent?

Gas amount per 100 units of volume for total mixture expresses the relative ratio of gas molecules in a mixture

10

what is formula for volume percent

Partial pressure/total pressure

11

what is Amount of heat (calories) required to convert 1 g of liquid agent into a vapor

Heat of Vaporization

12

what is Specific Heat

Heat (calories) required to raise the temperature of 1 g of agent by 1ºC

13

what is vapor pressure dependent on?

temperature & liquid

14

what does lowering the temperature do to vapor pressure?

causes a shift toward the liquid phase & a decrease in vapor pressure

15

what are PHYSICAL properites of ideal inhalation agent

Non-flammable & non-explosive at room temperature Vaporizable at room temperature Stable at room temperature with long shelf life Stable with soda lime, plastics, & metals Environmentally friendly (no ozone depletion) Cheap & easy to manufacture Non-flammable & non-explosive at room temperature Vaporizable at room temperature Stable at room temperature with long shelf life Stable with soda lime, plastics, & metals Environmentally friendly (no ozone depletion) Cheap & easy to manufacture Non-flammable & non-explosive at room temperature Vaporizable at room temperature Stable at room temperature with long shelf life Stable with soda lime, plastics, & metals Environmentally friendly (no ozone depletion) Cheap & easy to manufacture Non-flammable & non-explosive at room temperature Vaporizable at room temperature Stable at room temperature with long shelf life Stable with soda lime, plastics, & metals Environmentally friendly (no ozone depletion) Cheap & easy to manufacture

16

what are BIOLOGICAL properties of an inhalation agent?

Pleasant to inhale, not irritating, induces bronchodilation Low blood:gas solubility (fast onset) High oil:gas solubility (high potency) Minimal effects on body systems No biotransformation (ideally excreted via lungs unchanged) Non-toxic to operating room personnel

17

what are the vapor pressure (@ 20 C) of: isoflurane sevoflurane desflure

iso - 238 sevo - 157 des - 669

18

what is the MAC of: isoflurane sevoflurane desflure

iso - 1.15 sevo - 2.05 des - 6

19

What is the blood gas partition coefficient of isoflurane sevoflurane desflure

iso - 1.36 sevo - 0.6 des - 0.45

20

what's this ?

Q image thumb

 Datex Ohmeda Tec 6 Vaporizers

21

If the BG partition coefficient is high, then the agent is ______ soluble?

more

22

what effect does altitude have on a vaporizer?

Vaporizers calibrated at sea level High altitudes will change concentration

23

what's this?

Q image thumb

Datex-Ohmeda Tec 5 Vaporizers

24

Calculate the max agent concentration of an agent in the vaporizering chamber

vapor pressure / barometric pressure

25

how long will tec 6  vaporizer work on battery power

5 min

26

what is vaporizer equation

A image thumb
27

how is concentration regulated in vaporizers

Concentration calibrated (Variable Bypass) Measured flow (Copper Kettle)

28

what are examples of methods for vaporization?

flow over bubble through injection

29

what's this

Q image thumb

Datex-Ohmeda Tec 4 Vaporizers

30

what's this ?

Q image thumb

Datex Ohmeda Tec 6 Vaporizers

31

How do cooler temperatures effect the bimetallic strip in vaporizers?

cooler temps - contract strip (allow increased flow) warmer temp -- expands strip ( decrease flow)

32

how often do you callibrate a tec 4 vaporizer?

once a year (recommended)

33

what is the purpose of the vaporizer manifold?

Where vaporizers mounted on machine Passageway for fresh gas flow vaporizer interlock ensure only 1 vaporizer can be used at a time

34

how often should a Tec 6 vaporizer be callibrated?

every 2 years, but Tec 6 Plus is calibrated as needed

35

how does gas enter and leave the vaporizer?

port valves

36

what are the characteristics of a coper kettle?

Bubble through Out of circuit Measured flow Non-temperature compensated Multiple agent

37

what this?

Q image thumb

Datex-Ohmeda Tec 4 Vaporizers

38

what's this

Q image thumb

Datex-Ohmeda Tec 5 Vaporizers

39

how often do you calibrate a Tec 5 vaporizer?

every 3 years (recommended)

40

when does the no input alarm of the tec 6 vaporizer

Anesthetic agent level decreases to less than 20 mL
Vaporizer is tilted more than 10 degrees
Power failure occurs
Large disparity in pressure of vapor circuit & fresh gas circuit
Internal malfunction
 

41

which vaporizer does not require maintenance?

Tec 7 

aladin  cassette

42

what temp is the drager desfularane vaporizer heated to?

40 C

43