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Conduction disorders may be caused by structural problems in the heart or other medical conditions. Some people have a conduction disorder at birth, while others develop it later in life.
A congenital heart defect—one that is present at birth—can cause structural damage even when the heart appears normal. This can prevent the cardiac conduction system from working properly. For example, the conduction system may be damaged during fetal development. This is seen in people who have a Genetic condition called Holt-Oram syndrome, who have different degrees of cardiac conduction system problems such as AV block.
Other conditions that cause conduction disorders include the following: