EndoTracheal Tube via LMA

Updated September 27, 2013
Author: Makrides

Description: Choosing correct sizes when placing an ETT through the lumen of a LMA


These ETT sizes are based on attempting to insert the below listed ETT's thru the LMA Unique disposable LMA's

Recommended ETT size that fits thru disposable LMA's (LMA Unique brand only).
Disposable
LMA Size
 Uncuffed ETT
Cuffed ETT
 Maximum ETT size to fit thru LMA lumen
1.0 3.5 uncuffed 3.5 cuffed
1.5 4.0 uncuffed 4.0 cuffed
2. 0 5.5 uncuffed 5.5 cuffed
2.5 5.5 uncuffed 5.5 cuffed
3.0   7.0 uncuffed 6.5 cuffed
4.0 7.0 uncuffed 6.5 cuffed
5.0 7.0 uncuffed 7.0 cuffed

 
A.) surgilube recommended for placement of ETT thru LMA lumen
B.) Recommend undersizing by "one half" ETT size to maximize ease of slip thru of ETT thru LMA.
C.) Caution of tearing the ETT cuff of damaging the pilot baloon/tubing while placing the ETT thru the LMA.
 
ETT's used for sizing were as follows: 
a. Sheridan: 
    Uncuffed ETT's- 5.0, 5.5, 6.0, 6.5, 7.0.  
    Cuffed ETT's- 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 9.0 
b. Portex(Smith):  5.0 cuffed ETT
c. Mallincrodt: uncuffed ETT's only: 2.5, 3.0, 3.5, 4.0, 4.5
d. Kimberly Clark: cuffed ETT's only 3.0, 3.5, 4.0, 4.5