HEART BLOCK.

This is interruption of (or delay in) the conduction of the electrical impulse from the right auricle to the ventrical through the purkinje system of the heart.Heart block is of two types:(a)
AV block,in which impulses from SA node do not reach the AV node, and (b)bundlen branch block,wherein impulses fail to reach a ventricle.Only one branch of the bundle of His is involved.