I. Introduction
Cardiovascular diseases (CVD) cause the death of around 4.500.000 people per year in Europe, being the first cause of deaths. The challenge of the HEARTRONIC project is to provide a real solution for continuous monitoring and real time prevention, by means of early warning, to people already diagnosed as patients with high risk. The evolution of cardiovascular condition of these patients should be taken under close and real time control but currently this is not possible: the only option to monitor patients 24 hours a day is by hospitalization, which accounts for high costs and poses serious limitations to the patients' quality of life.