This records electrical activity of the heart and are used when a heart problem is suspected.
The QRS wave is caused by contraction of the ventricles. The T wave is caused by relaxation of the ventricles. The P wave is caused by excitation of the atria.
Heart attack= Elevation of ST section
Atrial fibrillation= small/hard to make out P wave
Abnormal ventricular hypertrophy= Deep S wave
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