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Ultrasonographic Confirmation of Endotracheal Tube Position in Neonates. OBJECTIVE: To compare endotracheal tube tip-to-carina distance obtained by ultrasonography vs. that obtained by chest X-ray in neonates. METHODS: After endotracheal intubation of 40 neonates, chest X-ray and, within one hour, ultrasonography was obtained for each patient for measurement of endotracheal tube tip-to-carina distance. RESULTS: Means of endotracheal tube tip-to-carina distances were not significantly different by both modalities (mean difference 0.157 cm, P= 0.06). In addition, an intraclass correlation was observed between them (r2= 0.61, 95% CI= 0.26, 0.79). CONCLUSION: Ultrasonography and chest X-ray are equally accurate for determination of endotracheal tube tip-to-carina in infants. As ultrasonography is more easily available and is safer than X-ray, it may be a better modality for confirming proper placement of endotracheal tube in neonates.