Figure 2:
Risk stratification algorithm for prevention of sudden cardiac death. *Risk factors include cardiac arrest,84,86 spontaneous sustained ventricular tachycardia,84,86 family history of premature sudden cardiac death,30 unexplained syncope,91 left ventricular thickness of 3 or more cm,36 abnormal blood pressure response to exercise85 and nonsustained ventricular tachycardia (≥ 3 beats, at least 120 beats/min).87 Possible risk factors include LVOT obstruction (≥ 50 mm Hg at rest),86 contrast cardiac magnetic resonance imaging with extensive delayed enhancement,90 and high-risk mutation. Note: ECG = electrocardiogram, LVOT = left ventricular outflow tract.