A. False. Attempts to oxygenate via the upper airways should continue during attempted cricothyroidotomy.

B. False. Size 10 and 22 blades have large, curved cutting edges. The size 10 blade is the same size as a 6 mm endotracheal tube.

C. False. Attempts to manage the upper airway, via trans-laryngeal intubation, or oxygenation, via a second generation supra-glottic airway device or bag-valve-mask system, should be optimized by administering a neuromuscular blocking agent to paralyse the muscles.

D. True. The most common complication is bleeding, usually controlled by proceeding to insert the tube and inflate the cuff. Potentially, any of the structures in the neck may be injured.

E. False. A size 7.5 inner diameter tube is too large for the cricothyroid membrane and a 6 mm diameter tube is probably the maximum size that can be inserted into the majority of adults.

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