CTM and ETT size

 Q: In emergent cricothyrotomy which size of an endotracheal tube (ETT) is preferred?  (select one)

 A) 6 

 B) 7 

 C) 7.5 

 D) 8 

E) 9 

 Answer: A 

 "Can't intubate, can't oxygenate" is the most dreaded situation for any intensivist. Cricothyroidotomy - also called cricothyrotomy or CTM - is truly a life-saving skill. In such situations, size #6 is preferred. 

ETTs are numbered based on their internal diameter in mm. ETT#6 has an outer diameter of 8-9 mm. Any tube higher than this size may damage the surrounding cartilage. 

But again, in such dire situations, there are no hard and fast rules. Preserving the airway is the goal.

#procedures

References:

1. Langvad S, Hyldmo PK, Nakstad AR, Vist GE, Sandberg M. Emergency cricothyrotomy--a systematic review. Scand J Trauma Resusc Emerg Med. 2013;21:43. Published 2013 May 31. doi:10.1186/1757-7241-21-43 

2. Salvino CK, Dries D, Gamelli R, et al. Emergency cricothyroidotomy in trauma victims. J Trauma 1993; 34:503. 

3. Gupta B, Gupta L. Significance of the outer diameter of an endotracheal tube: a lesser-known parameter. Korean J Anesthesiol 2019; 72:72.