Cardiac<unk>  is more of a clinical diagnosis, but still some diagnostic studies may be helpful.
Cardiac tamponade diagnostic study of choice
Myocardial rupture other diagnostic studies
Cardiogenic shock echocardiography or ultrasound
Pericardial effusion other diagnostic studies
Cardiac tamponade differential diagnosis
Aortic dissection diagnostic study of choice
Constrictive pericarditis diagnostic study of choice
Cardiogenic shock differential diagnosis