Elective Craniotomy Results in Respiratory Distress

A 60-year-old woman undergoes an elective craniotomy for clipping of a nonruptured aneurysm. The perioperative course is uneventful, and the aneurysm is clipped without complication. The patient is extubated and sent to the recovery room. Within 30 minutes, you are notified by the nurse that the patient is experiencing moderate respiratory distress. There are no neurologic deficits. Her medical history includes hypertension, hypercholesterolemia, and coronary artery disease, with previous stenting. Preoperative medical and cardiac clearance for the craniotomy had been obtained. Examination reveals the patient to be in a postanesthetic state, with mild-to-moderate dyspnea and tachypnea. She appears to be moving all of her extremities well. Her O2 saturation is 92% on 100% oxygen via a nonrebreather mask. Her breath sounds are significantly diminished on the left side. A stat portable chest radiograph is obtained. What is your impression?