After an intubated client is repositioned, oxygen saturation falls and chest expansion becomes unequal. Waveform capnography continues, and a suction catheter passes without resistance. Click the part of the tube shown that best explains these findings.

D. D shows the distal tip beyond the carina in a main bronchus, directing ventilation predominantly to one lung.

Persistent exhaled carbon dioxide supports airway rather than esophageal placement but does not establish appropriate depth. A patent tube can still extend too far. The depicted distal tip passes the bifurcation; its depth, not an obstruction at the connector or cuff, explains unequal expansion.

The observations are fictional teaching data. Apply the stated context; the selected feature does not by itself replace a complete bedside assessment.

Airway placement and correct depth are separate checks.

Airway placement and correct depth are separate checks.

A is the external connector and appears continuous. B is the cuff in the trachea above the bifurcation. C is the anatomical fork itself. D is the tube component positioned beyond that fork.

• Endotracheal tube depth despite persistent capnography — Airway placement and correct depth are separate checks.
• Comparison with context — Ongoing capnography can falsely reassure the learner even though tube depth is wrong.