Predicting proper endotracheal tube placement in underexposed radiographs: tangent line of the aortic arch.
OBJECTIVE: We investigated an indirect radiographic means of predicting proper endotracheal tube placement on underexposed portable chest radiographs. CONCLUSION: 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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