a nurse is caring for an asymptomatic client with acute myelogenous leukemia. the client has a total white blood cell (wbc) count of 0, a platelet count of 3,000 mm2, and a hemoglobin level of 9 mg/dl. the client has a single lumen central venous catheter in place and the health care provider has ordered the nurse to administer imipenem cilastatin 500 mg every 8 hours, transfuse 1 unit packed red blood cells (rbcs), give amphotericin b 40 mg i.v. over 4 hours, and transfuse 2 pheresis units of platelets. in what order should the nurse infuse these medications and blood products?