Massive Pericardial Effusion on Echocardiogram (S4C) demonstrating ECG alternans motion Massive pericardial effusion, female metastatic breast cancer ... 1800 ml Dr. Edgar Fuentes Molina @drEdgarFuentes #Pericardial #Effusion #Echocardiogram #malignant #clinical #cardiology #pocus #S4C #electrical #alternans