Predicting proper endotracheal tube placement in underexposed radiographs: tangent line of the aortic arch.

Pappas, J N; Goodman, P C · AJR Am J Roentgenol · 1999

cross_sectional · Level IV

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Abstract

We investigated an indirect radiographic means of predicting proper endotracheal tube placement on underexposed portable chest radiographs. When an endotracheal tube is 3.4-5.0 cm above the tangent line of the aortic arch, it is in proper position 95% of the time.

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