ECG

See

ECG is used to measure the rate and regularity of heartbeats as well as the size and position of the chambers, the presence of any damage to the heart, and the effects of drugs or devices used to regulate the heart (such as a pacemaker).
The ECG is a valuable, non-invasive diagnostic tool which was first put to clinical use in 1913 with Einthoven's invention of the string galvonometer.
The T wave indicates ventricular re-polarization Electrical energy is also generated by skeletal muscle, and can be seen as muscle artifacts if your arm is moved while the ECG is attached.
The ECG is a method of recording the electrical activity of the heart.
When is it used? The ECG is used to record heart rhythms.

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