Which of the following is NOT a typical method to verify King LT-D placement?

• A. Capnography waveform
• B. Chest rise
• C. Bilateral breath sounds
• D. Absence of air entry on capnography

Answer: (D)

Verification of King LT-D placement centers on confirming that ventilation is actually reaching the lungs. A capnography waveform shows that CO2 is being exhaled, which means air is passing into the lungs through the device. Chest rise during ventilation is a visible and practical sign that air is moving into the lungs, while bilateral breath sounds indicate air is entering both lungs rather than only one side or not at all.

The option describing absence of air entry on capnography isn’t used to verify correct placement. If there’s no CO2 waveform, that signals the device may not be ventilating the lungs properly or the circuit is not connected, which triggers reassessment and repositioning rather than serving as a positive verification of correct placement.