Review Question - QID 213854

A 36-year-old African American woman presents to the emergency department with a 1-month history of increasing shortness of breath. She says that she started noticing that she became short of breath while walking up the stairs to work and that over the last month this has progressed to where she is no longer able to take the stairs at all. She has also developed a dry cough as well as diffuse joint pain. On physical exam, her liver is palpable 4 cm below the right costal margin, and she has a palpably enlarged spleen. A radiograph is obtained with the findings shown in Figure A. Which of the following would most likely also be seen in this patient?