Cardiac tamponade occurs when a pericardial effusion ... based on hypotension with a large pericardial effusion; however, echocardiography can be helpful and can show right ventricular early ...

Cardiac tamponade is an uncommon ... poor prognosis even with early diagnosis and prompt treatment. Emergency echocardiography and echo-guided pericardiocentesis are often performed.

The differential diagnoses of SVC syndrome include cardiac tamponade and right ventricular dysfunction. Dedicated cardiac imaging with echocardiography can distinguish between these diagnoses.