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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).
Click for pdf: Tachycardia. Tachycardia is an abnormally rapid heart rate. In adults, this is usually defined as >100 beats per minute (bpm). In pediatrics, the normal heart rate varies with age (see Table 1). Therefore, in children, the definition of tachycardia is age dependent.