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Anesthesia Concepts > Medical Gas Systems > Flashcards

Medical Gas Systems Flashcards

1
Q

Sources of gas

Where you use NO2 cylinder

A

Piped in or cylinders (E size)

Cath lab or missions trip

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2
Q

Cylinder always serves as what

A

Back up

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3
Q

Oxygen located ____ to patient on mannifold

What role this serves

A

Closest

In case there is a leak of the other 2 gases

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4
Q

What lets us know there isn’t enough oxygen

What doesnt do this

A

Oxygen analyzer

Fail safe- senses pressure

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5
Q

Colors stand for which gas

Blue 
Yellow 
Black 
Brown 
Green
A 
Nitrous oxide
Air 
Nitrogen 
Helium 
Oxygen
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6
Q

E size oxygen cylinders considered full at __-__ psi and __-__ L. As its used the pressure falls ___ ___ to the amount left in the tank

A

625-700
2000-2200
In proportion

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7
Q

Air cylinders considered full at __-__ psi with ___ L. Pressure in tank falls __ __ to amount left in tank

A

1900-2000
625
In proportion

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8
Q

A full cylinder of N20 has pressure of __ psi and ___L. Stored as a ___. Pressure ___ __ indicate amount left in tank. How you determine this

A 
745
1590
Liquid 
Does not 
Weighing the cylinder
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9
Q

Pressure on n2o tank doesnt change until what

A

Almost empty and there is vapor

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10
Q

Full tank 2200 psi 650L
Current 750 psi, ?L

How many L left, running at 2LPM flow, how many minutes left

A

110 x 220/2

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11
Q

Purity of medical gases specified in US ___ and enforced by who

A

Pharmacopoeia

FDA

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12
Q

___ __ ___ est req for manufacturing, qualification, transportation, storage, handling, maintenance, and disposition of medical cylinders and containers

A

Dept of transportation

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13
Q

DOT requires what on each cylinder

A

Permanent marking on shoulder

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14
Q

Each cylinder must have a ___ on side but cant do what

A

Label (indicates flammability), cant cover permanent marking

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15
Q

Cylinder ___ indicate full, in use, or empty

A

Tags

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16
Q

What is safety system for medical gas pipeline as and what it does

A

Diameter index safety system

Non interchangeable connections on medical gas lines. Consists of body, nipple, and nut.

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17
Q

Never leave cylinder ___ without ___

Never leave ___ cylinders on machine

Never leave __ __ on port when installing cylinder

A

Upright, support

Empty

Plastic tape

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18
Q

Never rely on cylinder ___ for identification

Never ___ valves

A

Color

Oil

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19
Q

Before fitting applied to cylinder, particles should be cleared from ___ slowly by __ valve ___ from personnel

Valve should always be __ __ when a cylinder is in use. __ __ may not deliver enough gas

A

Outlet, cracking, away

Fully open, marginal open

20
Q

Vaporization definition

Why important

A

Conversion of liquid to gas

Inhalation agents we use are liquids converted to vapor to be inhaled

21
Q

Vaporization dependent on what

A

Vapor pressure, temperature, amount of carrier gas used

22
Q

Molecules of a volatile agent in a closed container are distributed between what

What creates vapor pressure

A

Liquid and gas phases

Gas molecules bombarding surface of liquid and walls of container

23
Q

Vapor Ps at 20 c

Enflurane

A

172 mmHg

24
Q

Vapor p isoflurane

A

240 mmhg

25
Q

Vapor p halothane

A

244 mmhg

26
Q

Vapor p sevoflurane

A

160 mmhg

27
Q

Vapor p desflurane

A

669 mmhg

28
Q

What is latent heat of vaporization

Energy for vaporization comes from what

A

calories req to change 1 gram of liquid into vapor without a T change

Liquid itself or an outside source

29
Q

Specific heat is what

What substance can be

A

calories needed to inc T of 1 gram of substance by 1 C

Liquid, solid, gas

30
Q

What is thermal conductivity

What a higher value of this means

A

Speed with which heat flows through a substance

Conducts heat better

31
Q

Altitude

How changes affect pressure

A

Increase altitude decrease barometric pressure

Decrease altitude increase barometric pressure

32
Q

Boiling point occurs when

Relationship between temperature and vaporization

A

Vapor pressure = barometric pressure

Direct relationship, both increase or both decrease

33
Q

Vaporizers
___ specific
___ compensated
___ __

A

Agent
Temperature
Variable bypass

34
Q

Variable bypass vaporizer

How it works

A

Part of gas flow passes into vaporizing chamber where its saturated with vapor

The vapor laden part rejoins gas flow for delivery and dilution

35
Q

When you need to calibrate vaporizer

A

When going to different atmospheric pressure, will give too much if going to lower atmospheric pressure

36
Q

% vapor delivered to pt is relative to __ __ in comparison to the __ __

A

Vapor pressure

Barometric pressure

37
Q

Vaporizer output isoflurane and how to calc

A

33%

Vapor pressure / atmospheric pressure

38
Q

Need a different vaporizer for which gas and why

What vaporizer does

A

Desflurane

Close to atmospheric pressure and boiling point.

Heater, false atm of 2 in unit. Create higher p with heat

39
Q

Variable bypass.

What you are doing at higher altitude

How to calc

A

Same partial pressure

X1= x (p/p1)

40
Q

Tec 6

How to calc req dial setting

A

Normal dial % x 760

/ambient pressure mmHg

41
Q

Tec 6
Have to deliver what at higher altitude and lower Barometric pressure

Conversely you do what in lower altitude to prevent what

A

Higher dialed concentration

Decrease output, prevent OD

42
Q

Copper kettle
___ flow, ___ through
Dedicated __ for the kettle to __ __

A

Measured, bubble

Flowmeter, measure flow

43
Q

Copper kettle
Gas comes through central tube inside vaporizer to the __ __
Flow of gas then direct down toward __ __ __

A

Loving cup

Liquid, bubble through

44
Q

How to calc vapor output

A

CG (carrier gas) x VP

/ BP (barometric) - VP

45
Q

How to calc anesthetic conc

A

Vapor output in ml/min

/ total gas flow ml/min

46
Q

Never fill vaporizer when

A

In the machine

47
Q

Potential vaporizer hazards

A

Wrong agent in vaporizer, contamination, tipping, overfilling, simultaneous admin of more than 1 vapor, leaks, pumping effect

Anesthesia Concepts (12 decks)

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