Causes of Heart block

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Heart block is caused by damage to the tissue that passes the electrical signals through the heart. This usually happens to older people who have had a heart disease such as:

cardiomyopathy (disease of heart muscle)
Coronary thrombosis (sudden blockage in the heart blood vessels)
myocarditis (inflammation of the muscle in the wall of the heart)
valvular heart disease (disease of the heart valves).

Sudden complete heart block (either temporary or permanent) can also happen after a heart operation or following a heart attack.

Heart block may also be caused by problems that have been there from birth (congenital heart block).