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Telemonitoring through multiple variables measured on cardiac devices has the potential to improve the follow-up of patients with heart failure. The HeartLogic algorithm (Boston Scientific), implemented in some implantable cardiac defibrillators and cardiac resynchronisation therapy, allows monitoring of the nocturnal heart rate, respiratory movements, thoracic impedance, physical activity and the intensity of heart tones, with the aim of predicting major clinical events. Although HeartLogic has demonstrated high sensitivity for the detection of heart failure decompensations, its effects on hospitalisation and mortality in randomised clinical trials has not yet been corroborated. This review details how the HeartLogic algorithm works, compiles available evidence from clinical studies, and discusses its application in daily clinical practice., Competing Interests: Disclosure: RCL declares fees for consultancy work from Boston Scientific. FAY declares fees for consultancy work and presentations from Boston Scientific, Medtronic and Abbott. RSB declares fees for consultancy work from Boston Scientific. JdJB declares fees for consultancy work and presentations from Boston Scientific. All other authors have no conflicts of interest to declare., (Copyright © 2022, Radcliffe Cardiology.)