Risk factors for sudden cardiac death to determine high risk patients in specific patient populations that may benefit from a wearable defibrillator

Table 2 Secondary prevention implantable cardioverter defibrillator studies

Study	Intervention/control group	Inclusion criteria	Risk reduction with ICD
Antiarrhythmics Versus Implantable Defibrillators study[17]	ICD vs antiarrhythmic drugs	Resuscitated from near-fatal VF or post-cardioversion from sustained VT	28% (P = 0.02)
Canadian Implantable Defibrillator Study[18]	ICD vs amiodarone	Resuscitated VF or VT or with unmonitored syncope	20% (P = 0.14)
Cardiac Arrest Study Hamburg[19]	ICD vs amiodarone vs metoprolol	Survivors of cardiac arrest secondary to documented ventricular arrhythmias	23% (P = 0.08)

ICD: Implantable cardioverter defibrillator; VF: Ventricular fibrillation; VT: Ventricular tachycardia.