noun, Pathology.
a defect in the electrical impulses of the heart resulting in any of various arrhythmias or irregularities in the heartbeat.
impaired conduction or blocking of the impulse that regulates the heartbeat, resulting in a lack of coordination between the beating of the atria and the ventricles Also called Adams-Stokes syndrome, atrioventricular block

heart block n.
A condition in which faulty transmission of the impulses that control the heartbeat results in a lack of coordination in the contraction of the atria and ventricles of the heart.

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