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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).
Bradyphrenia is defined as a pathological slowing of mental processes. First reported in parkinsonism, it is a sensitive but nonspecific indicator of cerebral pathology, white matter integrity, and frontosubcortical circuit disruption. Despite challenges in definition and quantification, reports dissociate bradyphrenia from aging, depression, and bradykinesia.