Monitoring and Equipment Flashcards

1
Q

What are cylinders made of?

A

Molybdnum steel - old style
Aluminium alloy wrapped in kevlar - new cylinders

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2
Q

Which cylinder cant be taken into MRI scanner

A

Molybdnum steel cylinders
ferromagnetic and would be drawn into the scanner

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3
Q

What is the pressure inside a size E cylinders

A

13700 kPa /137 bar

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4
Q

What does the tare weight refer to

A

Tare weight is the weight of the empty cylinder

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5
Q

What does a bodok seal do

A

Prevents a leak of gas between gas clinder and the cylinder block

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6
Q

What is the pressure in the Nitrous oxide pipeline

A

4 bar or 420kPa

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7
Q

On the anaesthetic machine what should be the minimum flow in the oxygen bypass circuit

A

30L/min

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8
Q

What is the function of the pressure relief valve on the back bar of the anaesthetic machine

A

to prevent damage to the vaporisers
to prevent damage to the rotameters
NOT PATIENT

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9
Q

At what pressure does the pressure relief valve on the back bar open

A

30-40kPa

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10
Q

What are the internal and external diameters of the common gas outlet on the anaesthetic machine

A

15mm and 22mm

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11
Q

What are the safety mechanisms to prevent the wrong gas coming out of the common gas outlets of the anaesthetic machine

A

Schrader valve pipeline
Non Interchangeable Screw Thread (NIST) on pipelines
Pin index classification
Colour coding of pipelines, cylinders and connections

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12
Q

What are the wavelengths of light emitted from the diodes in pulse oximeters

A

660nm and 940nm

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13
Q

How often do diodes flash

A

approx every 30 seconds

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14
Q

When might a pulse oximeter be inaccurate

A

CO poisoning
hypotension
peripheral vasoconstriction
arrhythmia
nail varnish
extraneous light

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15
Q

What does soda lima consist of

A

NaOH (4%)
calcium hydroxide 80%
bound h20 16%

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16
Q

What is the mesh size in the soda lime and why

A

4/8 mesh size
if granules are too small there will be too much space between them so resistance to flow of gas will be too high

17
Q

What is the mapleson D circuit also known as

A

Bain circuit
inefficient for SV more efficient for CV

18
Q

How much FGF is needed in a bain circuit in SV and CV

A

SV 2x MV
CV can be as low as 70ml/kg

19
Q

Why is the bain circuit more efficient in CV

A

due to long expiratory pause more fresh gas flow ill be available in the outer tubing

20
Q

What information is engraved on the gas cylinder

A

5 pieces of info
- unique serial number
- chemical formula of the gas on shoulder and valve block
- tare weight
-test pressure
-dates of tests performed

21
Q

What size cylinders do we commonly use in anaesthetic practice

A

SIZE E are used on the anaesthetic machine
Size J cylinders normally used in cylinder manifolds

22
Q

Differences betxygen ween oxygen and nitrous oxide cylinders

A

oxygen
- 137bar/13700kpa

n20
- stroed in liquid phase with vapour on top
-4400kpa
- due to critical temp is 36.5 C
- vapour used up first
- gauge continues to read 4400kpa until liquid has been used up and vapour remains
- need to assess how much is left via the weight

23
Q

What is critical temperature

A

defined as the temp above which the substance can not be liquified
n20 36.5 C

24
Q

What is pseudocritical temp

A

Used for gas mixtures such as entonox
the psuedocritical temp is the temp when there is a risk the gas mixture may separate out into its different gases
entonox -5.5C - if used concn of high o2 conc and then n20. rewarming cylinder will reverse this

25
What is the pin index system and why is it used
safety system to stop the wrong cylinder being attached to the anaesthetic machine each gas has its own pin index on the yolk pins and holes need to match
26
How are cylinders tested
cylinders in use are tested at regular intervals of 5 yrs 1 out of 100 cylinders goes under tensile strength testing internal endoscopic examination to look for cracks and defects cylinders are subject to high pressure of 22,000kPa
27