In addition to capnography, which imaging modality can verify endotracheal tube position when available?

• A. Chest radiography can verify endotracheal tube position when available.
• B. MRI is the standard method for initial confirmation.
• C. Ultrasound is the first-line confirmatory test.
• D. CT scan provides immediate tube position.

Answer: (A)

Beyond capnography, chest radiography is used to verify endotracheal tube position. It provides a clear image showing the tube tip relative to the carina, confirming the tube is in the trachea and at a safe depth. In adults, aim for the tip about 2–3 cm above the carina (adjust for pediatric size). Portable chest X-ray is quick, widely available, and can also assess other thoracic lines and overall lung status. Other imaging options aren’t as practical for immediate confirmation: MRI isn’t fast enough or commonly used for this purpose, CT isn’t immediate and isn’t feasible in unstable patients, and ultrasound, while helpful in some settings, isn’t the standard confirmatory test.