What is the best method for confirming proper placement of an endotracheal tube immediately following intubation?

The most effective method for confirming proper placement of an endotracheal tube immediately following intubation is to assess end-tidal CO2 with a colorimetric capnometer. This technique provides real-time confirmation that the tube is correctly placed within the trachea rather than in the esophagus, as it detects the presence of carbon dioxide in the exhaled breath, which would not be present if the tube were misplaced.

While obtaining a chest radiograph can provide a definitive confirmation of tube placement, it is not the best immediate method because it requires time for imaging and interpretation, which may delay critical care. Auscultating the neck is not a reliable method for confirming placement, as it does not effectively differentiate between tracheal and esophageal placement. Ensuring tube markings are between 20-24 cm at the teeth can offer a guideline for placement depth but does not guarantee proper placement in the trachea.

Overall, using a colorimetric capnometer offers immediate and reliable confirmation of endotracheal tube placement, making it the preferred choice in emergency settings.