Review Question - QID 108419

A 33-year-old patient presents to the clinic with a chief complaint of a dry cough that has started recently. The patient complains of shortness of breath in addition to his current symptoms. The patient has a history of HIV and medical non-compliance. In addition, he has an allergy to sulfa medications, for which he had been incubated in the past. His medical history is also significant for a blood transfusion secondary to primaquine administration. Notable laboratory findings are CD4 count of 175, an elevated LDH, and a pO2 of 55 mmHg. A chest radiograph is performed and demonstrates the findings in Figure A. The diagnosis is confirmed with bronchoalveolar lavage. The physician is concerned with this patient's toxic appearance and severe symptoms. Which of the following is the most appropriate next step in management?