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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).
Approach to Pediatric 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. Presentation varies with underlying cause, but most often the symptoms are vague and non-specific, such as âfussinessâ or âdifficulty feedingâ.