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Poor eating habits, a sedentary life style, and smoking have made acute coronary syndrome a disease characteristic of modern life, that it is expected to be the primary cause of death in the world by the year 2020, in spite of the development of reperfusion therapy and the use of defibrillators (Fuster, 2002). At the present time, cardiovascular diseases (CVDs) are the number one cause of death globally, and according to World Health Organization (WHO), an estimated 17.1 million people died of CVDs in 2004, representing 29% percent of all global deaths. Of these deaths, an estimated 7.2 million were due to coronary heart disease (CHD) (WHO, 2011). In Mexico, CVDs are the main cause of death, and the most frequent form is the ischemic heart disease (Instituto Nacional de Estadistica, Geografia e Informatica [INEGI], 2010). CHD involves a reduction in the blood supply to the myocardium by narrowing or blocking of the coronary arteries, so the cells in the region served by the vessel will behave abnormally due to hypoxia (myocardial ischemia) or may die (myocardial infarction). These abnormalities due to neuronal damage and metabolic derangements cause alterations in sympathetic and parasympathetic flow to the heart, leading to increased heterogeneity of ventricular repolarization and to the development of terminal arrhythmias (Metha, 1997). Therefore, the use and development of noninvasive techniques as electrocardiography, that records the electrical activity generated by the muscles of the heart in the surface on the body, opens a useful perspective for diagnosis and treatment in patients with heart diseases as the ischemia and infarction. The electrocardiogram (ECG) is the waveform produced by this electrical activity of the heart and its generation depends of four electrophysiological processes: the formation of electrical impulse in the main heart pacemaker (sinoatrial node), the transmission of this impulse through specialized fibers in the conduction, the activation (depolarization) and the recovery (repolarization) of the myocardium. The electrical activity generated by the heart can be modeled as a vector whose magnitude and direction changes throughout the cardiac cycle. To record the different projections of

ECG Ambulatory System for Long Term Monitoring of Heart Rate Dynamics