Secondary prevention strategies following SCA and unstable VT include ICD implantation, and medications. Based on meta-analysis of AVID trial implantation of ICD for secondary prevention of ventricular arrhythmia was superior to antiarrhythmic drugs in patients who survived of sudden cardiac arrest or unstable VT. Before ICD implantation, the reversible causes of ventricular arrhythmia including myocardial ischemia, electrolyte disturbance, proarrhythmic medication effect may be corrected. ICD implantation improved outcome in well-tolerated VT and structurally heart disease. Among patients with ischemia heart disease and syncope  due to inducible sustained monomorphic VT, ICD is recommended even if there is not other criteria for primary prevention.
Ventricular tachycardia secondary prevention
Ventricular tachycardia primary prevention
Pulseless ventricular tachycardia primary prevention
Long QT Syndrome secondary prevention
Third degree AV block secondary prevention
Atrial fibrillation secondary prevention
Atrial fibrillation primary prevention
ST elevation myocardial infarction secondary prevention