This study evaluates whether a rigorously controlled high-normal level of serum-potassium (4.5-5.0 mEq/L) using dietary recommendations, potassium supplements and mineralocorticoid receptor antagonists will results in a lower incidence of cardiac arrhythmias in patients with an ICD. Patients will be randomized to this treatment or a control arm, where patients will receive usual guideline recommended follow-up.
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Time to first occurrence of ECG documented ventricular tachycardia, appropriate ICD therapy, hospitalization > 24 hours due to arrhythmias and/or heart failure leading to a change in treatment and all cause mortality
Timeframe: Total 291 events, expected 6 years