A patient with an endotracheal tube (ETT) develops wheezing sounds during ventilation. Which condition is most likely?

Correct option is B

High-pitched wheeze in intubated patients is commonly due to bronchospasm or laryngospasm, causing airflow resistance despite tube patency.
Explanation of options: (a) ✘ Mucus plug causes absent/diminished breath sounds, not wheeze. (b) ✔ Correct; wheeze = airway narrowing from bronchospasm/laryngospasm. (c) ✘ Esophageal intubation = absent breath sounds + gastric inflation, not wheeze. (d) ✘ Pneumothorax = decreased/absent sounds, no wheeze.