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02-Aug-2014 18:34

The duration of the QRS complex is normally less than 0.12 second.

If the duration is increased, it is an indication of bundle branch block, a condition in which the ventricles are stimulated in a delayed, abnormal manner. The ST segment represents the period between the completion of depolarization and the beginning of repolarization of the ventricular musculature.

A progressive wave of stimulation (depolarization) passes through the heart causing contraction of the myocardium.

The heart remains physically quiet during repolarization, a strictly electrical phenomenon.

The ST segment may be elevated or depressed by either ischemia or infarction. The T wave represents the normal repolarization of ventricular myocardium that occurs after ventricular contraction.

The Normal Electrocardiogram is characterized by the wave form shown below.After the pause, the AV node is stimulated, initiating an electrical impulse that starts down the AV bundle into the Bundle Branches.The AV Bundle (Bundle of His) extends down from the AV node and divides into the Right and Left Bundle Branches within the interventricular septum.The electrocardiograph plots millivolts ( ↕ vertical axis ) over seconds ( ↔ horizontal axis ).

Each vertical space represents a voltage change of 0.1 (one-tenth) mv; the voltage between two of the heavy horizontal lines is 0.5 (one-half) mv.

During this interval, which normally does not exceed 0.20 second, the impulse traverses the atria and the AV node. The QRS complex represents depolarization of the ventricular muscle, and consists of an initial downward deflection (Q wave), a large upward deflection (R wave), and a second downward deflection (S wave).



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