An electrocardiogram records the electrical activity spreading through the heart during each phase of the cardiac cycle. Recording electrodes are placed on the body and transmitted to a machine called an electrocardiograph.
The P wave = Contraction of the atria
The QRS complex = Contraction of the ventricles
The T wave = Relaxation of the ventricles
The electrocardiogram can be used to find the heart rate and it can give important information about the condition of the heart muscle following a heart attack.
The leads are attached on the left arm, right arm, ankle and chest on the patient.
They are attached with conducting gel to ensure good electrical contact.
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