In the propagation of excitation from the node automaticity of the myocardium of the heart and reducing the electric potentials of individual muscle fibers are added together and the total potential is so great, that may be registered, even on the surface of the human body. Since the human heart has four chambers that are not reduced at the same time and in a certain sequence, the electrical signals from the heart, are complex. The curve of the electric potential at the two points of the electric field of the heart during the cardiac cycle called electrocardiogram (ECG). Since the electrical signals from the heart reaches all points of the body, the ECG can be recorded in various ways. However, most often used so-called standard ECG leads. The first recording standard lead electrodes disposed on the right and left hands, the second – on the right arm and left leg, at the third – on the left arm and left leg. ECG peaks usually denoted by Latin letters. Barb P – reflects the excitation of the atria, the complex QRS – reflects the spread of excitation of the ventricles, the T wave – reflects the recovery of myocardial ventricles after contraction. Interval T – P corresponds to a period of rest the heart – diastole. By the nature of the ECG can determine the rate and rhythm of the heart, and especially of its parts. In diseases of the heart or breaches its regulation form teeth and slots ECG changes, so ECG is an important diagnostic method.

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