Size compatibility of airway equipment in children, ETT and LMA

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Objectives

Information to help locate assemble & use airway equipment for difficult intubations.

Scope

These documents are procedural guidance

Audience

Anaesthetists and anaesthetic assistants experienced in the management of difficult airways in theatre.

LMA Size

Size 1 

Size 1 ½ 

Size 2 

Size 2 ½   

Size 3

ETT Maximum Size

3.0mm (ID) uncuffed

3.5mm (ID) uncuffed

4.5mm (ID) uncuffed

5.0mm (ID) uncuffed

6.0mm (ID) uncuffed      OR         5.5mm (ID) cuffed

  • Pilot balloon of cuffed endotracheal tubes will not pass through LMA less than size 3

Portex™  Intubating  Stylets 

Size

Small

Medium

Large    

External Diameter   

2.0mm  

4.0mm  

5.0mm  

ETT Compatible Size range   

2.5mm – 4.5mm (ID)

5.0mm – 8.0mm (ID) 

8.5mm – 11.0mm (ID)

 

Portex™ Tracheal Tube Guide (Bougie)

Size

5 FR

10 FR

15 FR    

External Diameter   

1.7mm  

3.3mm  

5.0mm  

ETT Compatible Size range   

2.0mm (ID)

3.5mm (ID)

5.5mm (ID)

 

Cook™ Airway Exchange Catheters

8 FR

11 FR 

14 FR        

 

3.0 ETT and larger

4.0 ETT and larger

5.0 ETT and larger

 

 

Anaesthetic Fibrescope

Olympus™ 2.2mm

Storz™ 2.8 mm  

Storz™ 4.0 mm  

Olympus™ 4.1 mm

ETT Minimum size

2.5mm (ID)

3.0mm (ID)

4.5mm (ID)

4.5mm (ID)

 

Editorial Information

Last reviewed: 03 April 2017

Next review: 06 April 2019

Author(s): Dr Neal Willis, Paediatric Anaesthetist RHC

Reviewer Name(s): Dr Alyson Walker Paediatric Anaesthetist RHC