A 57 year old female with a past medical history of SLE pres…
A 57 year old female with a past medical history of SLE presents with dyspnea. She admits to having a chest cold for the past 10 days. On physical exam, she is diaphoretic with a heart rate of 120 bpm. You order a preliminary CXR which shows an enlarged cardiac shadow, without infiltrate. The most likely diagnosis now is: