Described herein are methods for reducing ventricular tachycardia/ventricular fibrillation (VT/VF), methods for reducing implantable cardioverter-defibrillator device (ICD) shocks, methods for reducing CV hospitalization, ER visits, CV death or SCD in patients having implantable cardiac devices or CRT, and methods for reducing the use of ICD in a human patient without prior VT/VF, by administering an effective amount of the potent and selective late sodium ion channel blocker Compound 1.
