A 52-year-old man with dilated cardiomyopathy (ejection fraction 25%) and NYHA Class III heart failure is admitted with recurrent episodes of non-sustained ventricular tachycardia (NSVT) on 24-hour Holter monitoring. He is on optimal medical therapy (ACE inhibitor, beta-blocker, aldosterone antagonist). His electrolytes and renal function are normal. What is the most appropriate next step in management?

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