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An example of catheter tip measurements obtained at the time of placement (A) and at the time of catheter removal (B). A line was made perpendicular to the carina to allow accurate measurement of the catheter tip distance from the carina. In this case the catheter advanced 3.7 cm caudally, and was recorded as −3.7 cm when calculating the data (positive numbers migrated cranially towards or beyond the carina).
