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Continuing Education in Anaesthesia, Critical Care & Pain 2009 9(4):136-138; doi:10.1093/bjaceaccp/mkp022
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© The Author [2009]. Published by Oxford University Press on behalf of The Board of Directors of the British Journal of Anaesthesia. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournal.org

Multiple Choice Questions

The first 10% of the full text of this article appears below.

Physiology of apnoea and the benefits of preoxygenation

1. Time for desaturation to occur following the onset of apnoea is influenced by the following:
  1. Thyroid state of the patient.
  2. The efficacy of preoxygenation.
  3. The muscle relaxant used.
  4. Age of the patient.
  5. Weight of the patient.

2. Time for desaturation to occur following the onset of apnoea can be delayed by:
  1. Head down position.
  2. Insufflation of air.
  3. Preoxygenation.
  4. Sepsis.
  5. Maintaining a patent airway.

3. During apnoea:
  1. In a 1-month old child, the rate of decline of PaO2 is three times that of an adult.
  2. Increasing the oxygen fraction applied to the patent airway from 90–100% more than doubles open airway apnoea.
  3. Closed-airway apnoea results in a negative intrathoracic pressure, hastening hypoxia.
  4. Equal amounts of O2 and CO2 leave and enter the alveoli.
  5. The SaO2 starts to . . . [Full Text of this Article]

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