**1. Introduction**

Effective diagnosis of heart disease remains one of the main tasks of clinical medicine due to the high prevalence and socio-economic importance of diseases such as cardiovascular diseases, which in recent decades, have become a pandemic [1]. In most European countries per 100,000 people. Population accounts for no more than 300 deaths from cardiovascular diseases. It is clear that the need to improve methods for heart diseases detection is extremely actual. First of all, this applies to non-invasive methods that are the most accessible and safe.

Analysis of the electrical activity of the heart is still the most common, affordable, and cheapest method of objective examination of the heart. However, the sensitivity and specificity of routine electrocardiographic examination are not high enough. It is known, for example, that the resting ECG, assessed by its routine criteria, remains normal in approximately 50% of patients with chronic coronary heart disease, including during episodes of chest discomfort [2]. Improving diagnostics is possible only on the basis of innovative technologies.

The purpose of this chapter is to give an example of innovative technology introduced into practice, designed to register and evaluate subtle changes in the electromagnetic field of the heart for early diagnosis of the most common and dangerous heart diseases.
