It is the recording of electrical activity of the heart. Electrocardiograph is theinstrument which is used to record the electrical current generated in the heart.By means of this instrument, the electrical current generated in the heart is conducted to remote parts of the body. The heart current can be recorded by connecting any two parts of the body with this instrument. The connections are called as leads.
Lead I : Right arm and left arm.
Lead Il: Right arm and left leg.
Lead IlI: Left arm and left leg
Connections over the chest with indifferent electrodes are also sometimes used. The ECG recordings are disigned by letters P, Q, R, S, and T.
The wave P is caused by contraction of atria.The wave Q, R and S are produced by he contraction of ventricles.The wave T is produced by the relaxation of ventricles
During disease of the heart, these waves are abnormal in shape and position.
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