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Cardiac Axis in Right and Left Bundle Branch Block

Reading ECG (electrocardiogram) can be a tricky thing. It needs a clear understanding of the underlying physiology.

ECG is a graphical representation of the heart's electrical activity. With the help of the ECG, we can determine the heart rate, rhythm, axis or any other abnormality of the electrical conduction system. When ECG is not normal it means there is some problem in the conduction system. The cause of this problem is usually damage to the myocardium. The damaged myocardium or an abnormal myocardium can't conduct the electrical charges in a normal way and these abnormal conductions are reflected on an electrocardiogram (ECG).

Axis can also be determined with the help of an ECG. Cardiac axis can deviate to right or left. But please keep in mind in pure right bundle branch block or in pure left bundle branch block cardiac axis remains normal.

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Thus, if you find a right axis deviation or a left axis deviation think of a pathology. Please note that the right axis deviation can occur in a normal healthy person, on the other hand, a left axis deviation is always pathological.

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