Electrocardiography, or EKG, is used to record electrical activity in the heart to examine the functioning of the heart muscle and the neural transmission system. The heartbeat strokes are caused by voltage changes in the heart muscles.

The graph obtained by this recording is called “Electrocardiogram” (ECG) and the instrument used is called “Electrocardiography”. Voltages raised by a current amplifier (amplifier) ​​are recorded on the thermosensitive paper. The electrocardiogram device still works according to this system, despite some improvements recorded. Voltage changes are reflected on a special paper with a pen.

This electrical incident in the heart was first reported in 1903 at the University of Leyden by a Dutch physician, a physician with a cardiologist who, when examining this paper, obtained very important information about the regulation of heart sounds, the condition of ventricles and atria and the causes of chest pain. It was detected by Willem Einthowen through a primitive galvanometer. The Dutch physiologist Willem Einthowen, who developed his first electrocardiograph device from a galvanometer, won the Nobel Prize in this invention. The first device developed was weighing 270 kg. The electrocardiography device was shrunk as it was developed. Today, hand-held ECG devices are now lighter than 4.5 kg.

There are also more advanced recorders available. The operating principles of these devices are similar to those of Einthowen’s first device. Lately, computers have also been introduced into this area. It is also possible to record and display (on a screen) the ECG at the same time on the paper. There are also devices that instantly read and diagnose the information obtained.

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