**Abstract**

The chapter deals with magnetocardiography—a specific section of electrocardiography, which is designed to analyze the magnetic component of the electromagnetic field of the heart. Magnetocardiography is described as clinical information technology (IT), i.e., a set of methods, software, and hardware combined into a technological chain, the product of which is an automated diagnostic report. There are several examples of magnetocardiographic information technology implementation in clinical routine, aiming to register and evaluate subtle changes in the electromagnetic field of the heart for early diagnosis of the most common and dangerous heart diseases, especially coronary heart disease. It is shown that new metrics of analysis of spatial structure of 2D and 3D magnetocardiographic maps of current density distribution allow diagnosis with high accuracy of various forms of myocardial ischemia as well as myocardial damage in patients, recently recovered from COVID-19.

**Keywords:** magnetocardiography, coronary artery disease, non-coronarogenic diseases, myocardial damage, COVID-19, pattern recognition
