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Bradycardia is defined as a heart rate below the normal range for age (table 1). Bradycardia is caused by intrinsic dysfunction or injury to the heart's conduction system or by extrinsic factors acting on a normal heart and its conduction system. Children who have bradycardia with poor perfusion or shock need immediate medical attention (algorithm 1).
The electrical impulses in the heart can be too slow, causing a decrease in heart rate. This is called bradycardia; brady means slow and cardia means heart. Or, the impulses can be abnormally fast, which is called tachycardia; tachy means rapid or quick.