A 33-year-old woman G1P0 at 38 weeks’ gestation presents to the physician for a routine antenatal appointment. She has had a 1-month history of progressive shortness of breath with exertion. There is mild ankle edema. Cardiopulmonary examination shows diffuse crackles. Which of the following is the most appropriate next step in diagnosis?
A) Autoantibody screening
B) ECG
C) No specific diagnostic test necessary at this time
D) Transesophageal echocardiography
E) Transthoracic echocardiography
