A patient in the ICU receiving mechanical ventilation has just undergone a fiberoptic bronchoscopy procedure in which a tissue biopsy was collected. Immediately following the procedure, the respiratory therapist notes that the peak inspiratory pressure on the ventilator has increased. Potential causes for this include all of the following EXCEPT

A. hypoxemia.
B. pneumothorax.
C. pulmonary hemorrhage.
D. bronchospasm/laryngospasm.

Answer: A. hypoxemia.