For survivors of sudden cardiac death due to lethal arrhythmia from ischemic heart disease, coronary angiography and probable revascularization is recommended. Electrophysiology study is recommended for induction of bradyarrhythmia ,ventricular tachyarrhythmia, determination the indication for ICD implantation  in dilated cardiomyopathy,ARVC, HCM. Electrophysiology study is not recommended in long QT syndrome (LQTS), cathecolaminergic polymorphic ventricular tachycardia (CPVT), short QT syndrome (SQTS).
For survivors of sudden cardiac death due to lethal arrhythmia from ischemic heart disease, coronary angiography and probable revascularization is recommended.
Electrophysiology study is recommended for induction of bradyarrhythmia ,ventricular tachyarrhythmia, determination the indication for ICD implantation  in dilated cardiomyopathy,ARVC, HCM.
Electrophysiology study is not recommended in long QT syndrome (LQTS), cathecolaminergic polymorphic ventricular tachycardia (CPVT), short QTsyndrome (SQTS)..
Sudden cardiac death other diagnostic studies
Sudden cardiac death echocardiography and ultrasound
Cardiomyopathy echocardiography or ultrasound
Sudden cardiac death electrocardiogram
Incidentaloma electrocardiogram
The chest x-ray in cardiovascular disease
Atrial fibrillation laboratory findings
Sudden cardiac death laboratory findings