The section, European Diploma in Anaesthesia and intensive care ‘EDAIC’ MCQ and answer, covers a different topic each day with the intent that candidates can prepare one small topic each day, making steady progress in their exam preparation.
Question: identify correct statements regarding Paramagnetic analyzers:
- Can measure oxygen concentration in a mixture of gases
- Measure diamagnetic gases
- Can be used to measure gases in gas or liquid
- The magnetic field is generated by virtue of unpaired electrons in the inner shell of the molecule
- It can be used to measure nitrous oxide levels
Answers:
-
- True
- FAlse
- False
- FAlse
- False
In theatre, gas analysis usually takes the form of a paramagnetic cell.
Paramagnetic analyzers are gas analyzers and use the fact that oxygen is paramagnetic (it is
attracted to a magnetic field by the virtue of having unpaired electrons in their outer electron ring).
Diamagnetic gases are repelled and not measured. Most other gases in anaesthesia are only very weakly attracted into a magnetic field
Nitric oxide is also paramagnetic (but not nitrous oxide).
In older cells, a dumbbell and torsion wire system was used; however, modern systems use a switched electromagnetic field and pressure transducer.
The electromagnetic field is generated at approximately 110 Hz. This creates a pressure differential between the reference sample (usually clean air) and the patient’s sample.
A sensitive transducer detects the pressure fluctuations of approximately 20–50 µbar and converts them to a DC voltage, which is directly proportional to the concentration of oxygen.
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‘EDAIC MCQ (Multiple Choice Question) and answer’ covers a different topic each day with the intent that candidates can prepare one small topic each day, making steady progress in their exam preparation.
