Prepuncture Ultrasound-Measured Distance: An Accurate Reflection of Epidural Depth in Infants and Small Children

Ultrasound, particularly in the longitudinal median view, provides accurate information on the distance of skin-to-ligament flavum in infants and children. With reference to the measured distance, epidural puncture can be performed with minimal risk of dural puncture (upper limit of 95% CI = 1.67%).