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Machine Final > vaporizers > Flashcards

vaporizers Flashcards

1
Q

Functions of a vaporizer

A

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

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2
Q

how is vapor pressure created in the vaporizer?

A

gas molecules bombard the walls of the container

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3
Q

what plays a major role in vapor pressure

A

temperature, the higher the temp the greather the vapor pressure

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4
Q

what happens if the vaporizer does not keep a constant temperature

A

vapor pressure drops and agent becomes liquid again

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5
Q

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

A

saturated vapor pressure

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6
Q

what is equilibrium?

A

when the molecules in each phase remain constant

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7
Q

what is Temperature at which vapor pressure equals atmospheric pressure

A

boiling point

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8
Q

Part of total pressure from 1 gas in a mix

A

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

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9
Q

what is volume percent?

A

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

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10
Q

what is formula for volume percent

A

Partial pressure/total pressure

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11
Q

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

A

Heat of Vaporization

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12
Q

what is Specific Heat

A

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

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13
Q

what is vapor pressure dependent on?

A

temperature & liquid

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14
Q

what does lowering the temperature do to vapor pressure?

A

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

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15
Q

what are PHYSICAL properites of ideal inhalation agent

A

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

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16
Q

what are BIOLOGICAL properties of an inhalation agent?

A

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

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17
Q

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

A

iso - 238 sevo - 157 des - 669

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18
Q

what is the MAC of: isoflurane sevoflurane desflure

A

iso - 1.15 sevo - 2.05 des - 6

19
Q

What is the blood gas partition coefficient of isoflurane sevoflurane desflure

A

iso - 1.36 sevo - 0.6 des - 0.45

20
Q

what’s this ?

A

Datex Ohmeda Tec 6 Vaporizers

21
Q

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

A

more

22
Q

what effect does altitude have on a vaporizer?

A

Vaporizers calibrated at sea level High altitudes will change concentration

23
Q

what’s this?

A

Datex-Ohmeda Tec 5 Vaporizers

24
Q

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

A

vapor pressure / barometric pressure

25
Q

how long will tec 6 vaporizer work on battery power

A

5 min

26
Q

what is vaporizer equation

A
27
Q

how is concentration regulated in vaporizers

A

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

28
Q

what are examples of methods for vaporization?

A

flow over bubble through injection

29
Q

what’s this

A

Datex-Ohmeda Tec 4 Vaporizers

30
Q

what’s this ?

A

Datex Ohmeda Tec 6 Vaporizers

31
Q

How do cooler temperatures effect the bimetallic strip in vaporizers?

A

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

32
Q

how often do you callibrate a tec 4 vaporizer?

A

once a year (recommended)

33
Q

what is the purpose of the vaporizer manifold?

A

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

34
Q

how often should a Tec 6 vaporizer be callibrated?

A

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

35
Q

how does gas enter and leave the vaporizer?

A

port valves

36
Q

what are the characteristics of a coper kettle?

A

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

37
Q

what this?

A

Datex-Ohmeda Tec 4 Vaporizers

38
Q

what’s this

A

Datex-Ohmeda Tec 5 Vaporizers

39
Q

how often do you calibrate a Tec 5 vaporizer?

A

every 3 years (recommended)

40
Q

when does the no input alarm of the tec 6 vaporizer

A

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
Q

which vaporizer does not require maintenance?

A

Tec 7

aladin cassette

42
Q

what temp is the drager desfularane vaporizer heated to?

A

40 C

43
Q
A

Machine Final (9 decks)

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