A rapid beside echocardiogram can identify several rapidly reversible causes of PEA such as cardiac tamponade, myocardial infarction, cardiac rupture and underfilling of the ventricle due to hypovolemia.  Elevated right heart filling pressures suggest pulmonary embolism.  Tension pneumothorax can also be observed on a bedside echocardiogram
Pulseless electrical activity echocardiography
Torsades de pointes echocardiography
Coronary angiography quantitative angiography
Syncope echocardiography
Pulseless electrical activity electrocardiogram
Right bundle branch block echocardiography
Tricuspid regurgitation echocardiography
Doppler echocardiography