A 27-year-old female is hospitalized with a 2-month history of progressive exertional dyspnea and edema. There is no history of recent flu-like symptomsweight changearthritisor chest pain. An electrocardiogram (EKG) shows sinus tachycardia with normal intervals and no conduction delay. Which of the following conditions is the most likely cause of her symptoms?
a) Pulmonary embolism
b) Dilated cardiomyopathy
c) Pericardial effusion
d) Pulmonary hypertension
