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Clinical Cardiology and Cardiovascular Medicine (ISSN 2639-6807)



Electrocardiography is the process in which electrical activity of the heart is recorded by using electrodes placed on the skin over a period of time. These electrodes detect the tiny electrical changes on the skin that arise from the heart muscles electro physiologic pattern of depolarizing and repolarizing during each heartbeat. It is very commonly performed in order to detect any cardiac problems.

There are three main components to an ECG:

·         The P wave, which represents the depolarization of the atria

·         The QRS complex, which represents the depolarization of the ventricles

·         The T wave, which represents the repolarization of the ventricles. It can also be further broken down into the following:

    O is the origin or datum point preceding the cycle

    P is the atrial systole contraction pulse

    Q is a downward deflection immediately preceding the ventricular contraction

    R is the peak of the ventricular contraction

    S is the downward deflection immediately after the ventricular contraction

    T is the recovery of the ventricles

    U is the successor of the T wave but it is small and not always observed

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