Review Question - QID 108676

A 34-year-old woman presents to the emergency room with complaints of fever, cough, and hemoptysis. She has a history of acute myelogenous leukemia and is currently receiving consolidation chemotherapy after initial induction therapy with cytarabine and daunorubicin. She endorses increasing fatigue, which has resulted in her being bedridden for the last several days. In addition, she notes that her 6-year-old child has been recently ill with an upper respiratory tract infection. Her social history is notable for intermittent alcohol use, a 5 pack-year smoking history, and work as a social worker in various homeless shelters. Her temperature is 100.2°F (37.9°C), blood pressure is 102/70 mmHg, pulse is 100/min, respirations are 18/min, and oxygen saturation is 92% on room air. Her laboratory results are as follows:

Serum:
Na+: 142 mEq/L
K+: 4.4 mEq/L
Cl-: 100 mEq/L
BUN: 20 mg/dL
Glucose: 100 mg/dL
Creatinine: 1.1 mg/dL

Hemoglobin: 12.4 g/dL
Leukocyte count: 200/mm^3
Platelet count: 150,000/mm^3

A chest radiograph is obtained and the results are shown in Figure A. Serum galactomannan levels are elevated. Which of the following is the most appropriate next step in the treatment of this patient?