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Anesthesia Machine > Anesthesia Machine > Flashcards

Anesthesia Machine Flashcards

1
Q

Who decides what is needed for an anesthesia work station

A

the American Society for Testing and Materials

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2
Q

What are the required conponents of an Anesthesia work station

A
  • battery backup (30min minimun)
  • alarms:high, medium, or low priority
  • pO2, BP, EKG monitors
  • PIN-indexed hanger yoke system
  • flowmeters
  • at least one oxygen cylinder attached
  • electricle cord that is non-detachable
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3
Q

High Priority alarms may not be silenced for more than….

A

2 mins

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4
Q

When should a High-priority pressure alarm must sound?

A
  • if user adjustable limits are exceeded
  • if continuing high pressure is sensed
  • for negative pressure
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5
Q

What are the required monitors

A
  • exhaled volume
  • inspired oxygen with a high priority alarm that will alarm within 30sec of O2 falling below 18%(or user adjustable limit)
  • O2 supply failure alarm
  • hypoxic guard mixture if nitrogen is used(O2 less than 21%)
  • anesthetic vapor conentration
  • disconnect alarm
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6
Q

What are Flowmeters

A
  • uniquely shaped oxygen flow control knobs
  • with a valve stop to prevent access rotation
  • O2 must enter common manifold downstream of other gases
  • O2 flush capable of 35-75L/min flow which does not proceed through any vaporizers
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7
Q

A Hanger Yoke Assembly must use what type of connecting system

A

Pin-Index Safety System (PISS)

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8
Q

What are the functions of a Hanger Yoke Assembly

A
  • connects E-cylinders to machine
  • ensure gas tight seal
  • orients cylinders (PISS)
  • prevents misconnections
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9
Q

Gases from a central suppy source ( wall source) enter the machine at a PSI of…

A

45-55

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10
Q

Where are check valves located and what are their funtions

A

located downstream to prevent backflow of gases from machine to wall supply

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11
Q

What is the PSI of an O2 E-cylinder

A

-2000 psi which is reduced to 40-50 psi when it passes through the hanger yoke valve and pressure regulator

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12
Q

what is a Hanger Yoke Check Valve

A
  • a free floating valve (opens and closes with pressure)
  • prevents retrograde gas flow
  • allows change of cylinders during use
  • minimizes transfilling of gases
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13
Q

Air Index Pin

A

1, & 5

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14
Q

Oxygen Index Pin

A

2, & 5

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15
Q

Nitrous Index Pin

A

3, & 5

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16
Q

How to convert cylinder PSI to Liters

A
  • multiply PSI by 0.3
  • O2: 2000-2200 PSI-660L
  • N2: 750 PSIG-1590L
  • Air: 1900 PSI-625L
17
Q

what is the function of a Cylinder Pressure Regulator

A
  • converts cylinder pressure to a constant pressure of about 45psi dowmstream of the regulator
  • this is to allow the machine to use the pipeline gas source with the higher pressure
  • helps prevent cylinder depletion if left open
18
Q

How is TIME to O2 cylinder exhaustion calculated

A

dividing the the remaining O2 volume in the cylinder by the rate of O2 consumption

19
Q

How it the volume of N2O in a cylinder dertermined

A
  • the volume of N2O cannot be determined by PSIG
  • N2O reads 745 PSIG until all the liquid in the cylinder is vaporized
  • it can be assumed that 75% (or 3/4) of N2O has been exhausted when the pressure reads less than 745 PSIG
20
Q

what is Critical Temperature

A

the temperature above at which a gas CANNOT be liquidfied

21
Q

What is the Critical temperature of oxygen and N2O

A 
Oxygen= -119 degrees C
N2O= 39.5 degrees C

F= (C x 1.8) + 32
C=(F-32) x 5/9

22
Q

what is Woods Metal

A

a safety device in a E-cylinder that melts under excessive heat (>200 F) to allow gas to escape preventing an explosion

23
Q

what is the Joules Thomas Effect

A

the cooling effect of a cylinder once compressed gas is allowed to escape in open space

24
Q

what is Adiabatic Heat of Compression

A

the generation of heat by compression of cylinder contents into a small space that may cause combustion

25
Q

Who establishes criteria for the design, testing, labeling, and storage of medical gas cylinders

A
  • DOT

- all cylinders must be marked according to interstate commerse commission specifications

26
Q

what are the duties of US Pharmacopecia and National Formulary

A

develope purity and specifications of gases

27
Q

Hook up of O2 source to anesthesia machine results in 5 immediate funtions: 1 -2

A
  1. Power outlet accessory-provides pressure here where vent is
  2. O2 flush valve-located at machine outlet circuit, 35-75 l/min
28
Q

Hook up of O2 source to anesthesia machine results in 5 immediate funtions: 3

A
  1. Pressure sensor shut off valve
    - it is held open when O2 is supplied at about 50 psi which allows N2O to flow to the flowmeter
    - remains open as long as PSI remains >25, if it falls below 25 PSI, N2O flow will shut off (this is why O2 is the most downstream gas)
29
Q

Hook up of O2 source to anesthesia machine results in 5 immediate funtions: 4

A
  1. Supply failure alarm system
    - activated when O2 falls below 28 PSI
    - alarm sounds before 25 PSI, the level at which N2o flow will cease
30
Q

Hook up of O2 source to anesthesia machine results in 5 immediate funtions: 5

A
  1. Second stage pressure regulator
    - gas pressure is decreased to a constant pressure of 16 PSI as flow from wall varies b/t 40-50 PSI
    - after passing second stage pressure regulator, it sits in stand-by at flow control valve

Anesthesia Machine (1 decks)

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