The subcostal view of a 2D echocardiogram shows a large pericardial effusion encircling the heart which shows a "swinging" motion during the cardiac cycle. There is also diastolic collapse of the right atrium and ventricle, a result of tamponade.
2D: 2-dimensional; LA: left atrium; LV: left ventricle; PE: pericardial effusion; RA: right atrium; RV: right ventricle.
Courtesy of Thomas Binder, MD. University of Vienna.