- Subject with a history of at least one heart failure (HF) hospitalization (as defined in the European Society of Cardiology or American College of Cardiology/American Heart Association guidelines), emergency department (ED) visit, or urgent office visit necessitating intravenous (IV) diuretic or augmentation of oral diuretic, IV inotropic, or IV vasodilator or other HF parenteral therapy within 15 days prior to device implant