Butz developed equations to approximate dimensions of the trachea in pediatric patients. The authors is from Ball Memorial Hospital in Muncie, Indiana.
Population: up to 14 years of age (only 24 tracheas examined)
length of the trachea in mm =
= (30 * LOG10 (weight in pounds)) + 10
Converting this to kilograms:
= (30 * LOG10 (2.2 * (weight in kg))) + 10
cross-sectional area in square mm =
= (0.7 * (body weight in pounds)) + 8
= (1.54 * (body weight in kg)) + 8
If we assume the trachea is round then the diameter of the trachea (and the maximum outer diameter of an intubating tube) is:
diameter in mm =
= 2 * SQRT((area in square mm) / PI())
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Specialty: Pulmonology, Emergency Medicine, Pedatrics