The Optimal Leg Angulation of Femoral Central Catheterization in Pediatrics

"The optimal range of leg abduction was defined as the range without overlap in A group and the range presenting that the overlap was less-than half of the diameter of femoral vein in S group.~A1 angle defined the point that the femoral vein and artery started non-overlapping interval when increasing the angle of the leg in the A group and the A2 angle is defined the point that the femoral vein and artery ended non-overlapping interval."

B1 is the angle at which the overlap starts at the half of the femoral vein radius when increasing the angle of the leg in the S group, B2 is the angle at which overlap starts at half or more of the femoral vein radius again. In the range of B1 and B2 angles, they are overlapped by half or less of the femoral vein radius.