An electrocardiograph is a medical equipment for clinical diagnosis, which is responsible for capturing and amplifying the electrical activity of the patient's heart through the use of electrodes. The recording of this activity is called an electrocardiogram (ECG), which is defined as the continuous recording of the heart's electrical impulses, and is commonly used by physicians to determine any damage to the heart, whether there are abnormal heart palpitations, the size and position of the heart chambers, and the effects of drugs or devices used to control the heart (such as pacemakers).
This medical device is part of a science called bioinstrumentation, a branch of biomedical engineering. This is responsible for retrieving specific biosignals from the human body and then processing them in such a way that physicians can interpret them to obtain a diagnosis of the patient in the least invasive way possible.