Uemura and Yamashita et al reported a formula for predicting the distance from the skin surface to the epidural space in infants and children. The authors are from Ibaraki Children's Hospital in Mito, Japan.

Patient selection: mean age 1.9 years, range from 0 to 10


Intervertebral space: L3/L4



(1) body weight in kilograms


distance in millimeters =

= (0.789 * (weight in kilograms)) + 7.719




distance in millimeters =

= (0.8 * (weight in kilograms+ 8

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