 ### Description

Eck et al developed an equation for predicting the proper size of a tracheal tube to use in a child. Proper sizing of the tube can help minimize the risk of complications such as subglottic stenosis. The authors are from Duke University.

Patient selection: child up through 7 years of age

Parameters:

(1) age in years (represented as a decimal)

(2) height in cm

(3) weight in kilograms

tracheal tube diameter in mm =

= (0.1 * (age in years)) + (0.02 * (height in cm)) + (0.016 * (weight in kg)) + 2.44

tracheal tube diameter in mm if age < 1 year =

= (0.6 * (age in years)) + (0.009 * (height in cm)) + (0.05 * (weight in kg)) + 2.45

tracheal tube diameter in mm if age 1 to 7 years =

= (0.15 * (age in years)) + (0.008 * (height in cm)) + (0.018 * (weight in kg)) + 3.25

Other formulae given for age < 1 year:

tracheal tube diameter =

= (age in years) + 3.2

= ((weight in kilograms) / 8.8) + 3

= ((height in cm) / 27) + 1.4

Other formulae given for age 1 - 7 years:

tracheal tube diameter =

= ((weight in kilograms) / 12) + 3.6

= ((height in cm) / 27) + 1.85

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