Intracardiac defibrillator (ICD) is useful in which of the following ?: (A) Person with Brugada, (B) Person with Arrhythmogenic RV dysplasia, (C) Person after acute MI with CAD, (D) All of the above
Answer is D. Ref. AHA guidelines
 
ICD Indications (AHA Guidelines)
Class I indications (ie, the benefit greatly outweighs the risk, and the treatment should be administered) are as follows:

Structural heart disease, sustained VT
Syncope of undetermined origin, inducible VT or VF at electrophysiologic study (EPS)
Left ventricular ejection fraction (LVEF) ≤35% due to prior MI, at least 40 days post-MI, NYHA class II or III
LVEF ≤35%, NYHA class II or III
LVEF ≤30% due to prior MI, at least 40 days post-MI
LVEF ≤40% due to prior MI, inducible VT or VF at EPS

 
Class IIa indications (ie, the benefit outweighs the risk and it is reasonable to administer the treatment) are as follows:

Unexplained syncope, significant LV dysfunction, nonischemic cardiomyopathy
Sustained VT, normal or near-normal ventricular function
Hypertrophic cardiomyopathy with 1 or more major risk factors
Arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARVD/C) with 1 or more risk factors for sudden cardiac death (SCD)
Long QT syndrome, syncope or VT while receiving beta-blockers
Nonhospitalized patients awaiting heart transplant
Brugada syndrome, syncope or VT
Catecholaminergic polymorphic VT, syncope or VT while receiving beta-blockers
Cardiac sarcoidosis, giant cell myocarditis, or Chagas disease