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What is a Heart Block?

The heart has an electrical system that controls the rate and rhythm of heart beats. An electrical signal spreads across the heart from the two upper chambers (atria) to the two lower chambers (ventricles) with each heart beat, causing the contraction of heart muscles. The result is pumping of blood from one chamber to the next, and into the general circulation of the body.

When the electrical impulses from an atrium to the ventricle are slowed down or disrupted, an atrio-ventricular heart block is said to occur. This results in an arrhythmia, or a disturbance in the rhythm or pattern of heart beats.

A heart block may be congenital or acquired during one’s lifetime. Congenital heart blocks often occur with congenital heart defects that a baby is born with, whereas acquired heart blocks are usually associated with heart diseases that develop as a person ages. Acquired heart blocks are more common than the congenital ones.

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