Medical Gas Systems Flashcards
Sources of gas
Where you use NO2 cylinder
Piped in or cylinders (E size)
Cath lab or missions trip
Cylinder always serves as what
Back up
Oxygen located ____ to patient on mannifold
What role this serves
Closest
In case there is a leak of the other 2 gases
What lets us know there isn’t enough oxygen
What doesnt do this
Oxygen analyzer
Fail safe- senses pressure
Colors stand for which gas
Blue Yellow Black Brown Green
Nitrous oxide Air Nitrogen Helium Oxygen
E size oxygen cylinders considered full at __-__ psi and __-__ L. As its used the pressure falls ___ ___ to the amount left in the tank
625-700
2000-2200
In proportion
Air cylinders considered full at __-__ psi with ___ L. Pressure in tank falls __ __ to amount left in tank
1900-2000
625
In proportion
A full cylinder of N20 has pressure of __ psi and ___L. Stored as a ___. Pressure ___ __ indicate amount left in tank. How you determine this
745 1590 Liquid Does not Weighing the cylinder
Pressure on n2o tank doesnt change until what
Almost empty and there is vapor
Full tank 2200 psi 650L
Current 750 psi, ?L
How many L left, running at 2LPM flow, how many minutes left
110 x 220/2
Purity of medical gases specified in US ___ and enforced by who
Pharmacopoeia
FDA
___ __ ___ est req for manufacturing, qualification, transportation, storage, handling, maintenance, and disposition of medical cylinders and containers
Dept of transportation
DOT requires what on each cylinder
Permanent marking on shoulder
Each cylinder must have a ___ on side but cant do what
Label (indicates flammability), cant cover permanent marking
Cylinder ___ indicate full, in use, or empty
Tags
What is safety system for medical gas pipeline as and what it does
Diameter index safety system
Non interchangeable connections on medical gas lines. Consists of body, nipple, and nut.
Never leave cylinder ___ without ___
Never leave ___ cylinders on machine
Never leave __ __ on port when installing cylinder
Upright, support
Empty
Plastic tape
Never rely on cylinder ___ for identification
Never ___ valves
Color
Oil
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
Outlet, cracking, away
Fully open, marginal open
Vaporization definition
Why important
Conversion of liquid to gas
Inhalation agents we use are liquids converted to vapor to be inhaled
Vaporization dependent on what
Vapor pressure, temperature, amount of carrier gas used
Molecules of a volatile agent in a closed container are distributed between what
What creates vapor pressure
Liquid and gas phases
Gas molecules bombarding surface of liquid and walls of container
Vapor Ps at 20 c
Enflurane
172 mmHg
Vapor p isoflurane
240 mmhg
Vapor p halothane
244 mmhg
Vapor p sevoflurane
160 mmhg
Vapor p desflurane
669 mmhg
What is latent heat of vaporization
Energy for vaporization comes from what
calories req to change 1 gram of liquid into vapor without a T change
Liquid itself or an outside source
Specific heat is what
What substance can be
calories needed to inc T of 1 gram of substance by 1 C
Liquid, solid, gas
What is thermal conductivity
What a higher value of this means
Speed with which heat flows through a substance
Conducts heat better
Altitude
How changes affect pressure
Increase altitude decrease barometric pressure
Decrease altitude increase barometric pressure
Boiling point occurs when
Relationship between temperature and vaporization
Vapor pressure = barometric pressure
Direct relationship, both increase or both decrease
Vaporizers
___ specific
___ compensated
___ __
Agent
Temperature
Variable bypass
Variable bypass vaporizer
How it works
Part of gas flow passes into vaporizing chamber where its saturated with vapor
The vapor laden part rejoins gas flow for delivery and dilution
When you need to calibrate vaporizer
When going to different atmospheric pressure, will give too much if going to lower atmospheric pressure
% vapor delivered to pt is relative to __ __ in comparison to the __ __
Vapor pressure
Barometric pressure
Vaporizer output isoflurane and how to calc
33%
Vapor pressure / atmospheric pressure
Need a different vaporizer for which gas and why
What vaporizer does
Desflurane
Close to atmospheric pressure and boiling point.
Heater, false atm of 2 in unit. Create higher p with heat
Variable bypass.
What you are doing at higher altitude
How to calc
Same partial pressure
X1= x (p/p1)
Tec 6
How to calc req dial setting
Normal dial % x 760
/ambient pressure mmHg
Tec 6
Have to deliver what at higher altitude and lower Barometric pressure
Conversely you do what in lower altitude to prevent what
Higher dialed concentration
Decrease output, prevent OD
Copper kettle
___ flow, ___ through
Dedicated __ for the kettle to __ __
Measured, bubble
Flowmeter, measure flow
Copper kettle
Gas comes through central tube inside vaporizer to the __ __
Flow of gas then direct down toward __ __ __
Loving cup
Liquid, bubble through
How to calc vapor output
CG (carrier gas) x VP
/ BP (barometric) - VP
How to calc anesthetic conc
Vapor output in ml/min
/ total gas flow ml/min
Never fill vaporizer when
In the machine
Potential vaporizer hazards
Wrong agent in vaporizer, contamination, tipping, overfilling, simultaneous admin of more than 1 vapor, leaks, pumping effect
