ETT

Question 1

Size of ETT uncuffed
Size of cuffed tube
Appropriate depth of ETT
Infant airway is easily obstructed?

Answer 1

(Age in year/ 4) +4 if uncuffed

(Age in year/ 4) +3 if uncuffed

Depth a
(Age in year/2) +12

Easily obstructed as small changes in diameter ( air flow inversely proportionate to radius to power of 4) ( poiseuille), soft collapsible tracheal cartilage ( if hyperextended) , smaller oropharynx, smaller airways

Question 2

Cuffed tube or uncuffed tube in children

Answer 2

Now cuffed tube is as safe as cuffed regarding pressure on cricoid cartilage
Cuffed can be used beyond newborn to decrease air glottic air leak
( before cuffed only above 8 years)