Emergency Medicine Journal 2009;26:388
© 2009 BMJ Publishing Group Ltd and the College of Emergency Medicine.
EMQ ANSWERS
For questions on page 315
| The first 150 words of the full text of this article appear below. |
ANSWER 1
- True. At least 12–15 l/min. Otherwise there is potential for rebreathing because of carbon dioxide retention in the reservoir bag—exhaled gas will escape only if the fresh gas flow is great enough.1
- True. Unless the self-inflating bag has a reservoir, it entrains both air and wall oxygen as it inflates. With a full reservoir, it will deliver closer to 100% oxygen.1
- False. While giving better tactile feedback to the airway practitioner, a Water’s circuit is useless if the oxygen supply fails. A self-inflating bag is de rigueur for transport.1
- True. Unlike Hudson masks or nasal cannulae in which the precise FiO2 is unknown.2
ANSWER 2
- True or false! Etomidate offers greater haemodynamic stability and a wider safety margin in unstable patients than many other induction agents. However, transient suppression of the adrenal axis has made its use in septic patients controversial—adrenal suppression has been associated with a moderately increased risk of
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