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Primary Viva 21 (Physics)

Created: 27/6/2006
Updated: 8/1/2007
1. Describe the mechanism of action of pH and CO2 electrodes.
2. Describe errors in the measurement of CO2 and pH while taking arterial blood gases
3. What are the two calibration points for the pH electrode in the ABG machine?
4. How does the ABG machine calibrate CO2? ( ABG machines contain a CO2 cylinder of known concentration for calibration).
5. You are shown photographs of various methods of measuring temperature (e.g. oesophageal probe, mercury thermometer, Bourdon gauge thermometer, bimetallic strip) and asked various questions on them.
6. Draw the thermistor resistance curve
7. What are the advantages and disadvantages of a thermister?
8. What are the principles and disadvantages of a mercury thermometer?
9. What is the Seeback effect?
10. What are the two metals used in this effect?
11. What is the composition of constantin?
12. You are shown photographs of various endotracheal tubes: an 8.0 RAE, a standard 8.0, and an uncuffed 4.0.
– Of these, which will have the highest resistance and why?
13. Explain the Poiseuille formula.
14. Which is the site of highest resistance in a circuit with an endotracheal tube?
15. Why is the 4.0 endotracheal tube uncuffed?

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