(a)
(b)
Figure 2: ECG and echocardiography on day 4. (a) Twelve-lead ECG during the fourth day of admission shows atrial fibrillation and microvoltages, indicative of increased pericardial effusion. (b) Ultrasound studies confirmed the presence of large (>20 mm) pericardial effusion, here shown on the subcostal view and indicated with the white marker.