OptiVol for Precision Medical Management of Heart Failure

Inclusion Criteria: * 18 to 85 years of age on the date of randomization * ICD implantation per guidelines for primary prevention in patients with ischemic and non-ischemic cardiomyopathy ≥3 calendar months ago. * SMART Phone or tablet with Bluetooth capability with internet access. * No other identifiable reversible cause explaining the left ventricular dysfunction Exclusion Criteria: * CRT implanted * LVEF\>45% in the last echocardiogram or other clinic imaging study performed. * Medtronic device generator and/or device components not implanted * Unstable clinical condition, life threatening arrhythmia * Heart failure hospitalization within the preceding 3 calendar months * Cognitive impairment * Severe renal dysfunction (eGFR \< 30 ml/min/m2) * Serious known concomitant disease with a lift expectancy of \< 12 calendar months * Non-ambulatory NYHA class IV * Pregnancy