Vali et al reported equations for determining the insertion length for umbilical catheters. Anatomic landmarks are used for calculating the length of the umbilical venous catheter. The authors are from the University of California San Diego.
Measurements of the infant supine in lateral radiograph or physical exam
(1) vertical line from the xiphoid to bed
(2) vertical line from the umbilicus to bed distance
The midpoint of each line is identified, then a line is made between the midpoints.
The insertion length of the umbilical venous catheter in cm is the distance of the line connecting the midpoint of line 1 to the midpoint of line 2.
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