Review Question - QID 109457

A 35-year-old woman presents to the emergency department for shortness of breath. Her symptoms have been worsening gradually over the past several months. She is clutching her left chest and states she is experiencing pain in this area. The patient works in a shipyard and competes in bodybuilding competitions. The patient has a medical history of asthma and rheumatoid arthritis. Her current medications include albuterol and ibuprofen. She admits to alcohol and anabolic steroid use. Her temperature is 99.5°F (37.5°C), blood pressure is 137/85 mmHg, pulse is 90/min, respirations are 15/min, and oxygen saturation is 81% on room air. Laboratory values are ordered and are as follows:

Serum:
Na+: 136 mEq/L
Cl-: 102 mEq/L
K+: 4.2 mEq/L
HCO3-: 24 mEq/L
BUN: 20 mg/dL
Glucose: 111 mg/dL
Creatinine: 1.2 mg/dL
Ca2+: 10.1 mg/dL
AST: 32 U/L
ALT: 33 U/L
Brain natriuretic peptide: 845 pg/mL
Hemoglobin: 10 g/dL
Hematocrit: 29%
Leukocyte count: 8,000 cells/mm^3 with normal differential
Platelet count: 150,000/mm^3

An ECG is ordered as seen in Figure A. An ultrasound is performed demonstrating ventricular septal flattening and right ventricular dilatation with tricuspid regurgitation. The patient seems to be in distress and short of breath. Cardiac exam is notable for JVD and tachycardia. Pulmonary exam reveals mild wheezes bilaterally. Abdominal exam is notable for a liver edge that is palpable inferior to the rib cage. The patient has mild lower extremity pitting edema bilaterally. Which of the following treatments is most appropriate for addressing the underlying pathophysiology of this patient's presentation?