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The stimulant drug methylphenidate is associated with an increased risk of arrhythmias and myocardial infarction in children with attention deficit hyperactivity disorder during the early period of treatment, a study has found

Researchers also found that the risk of arrhythmias was particularly pronounced among children with congenital heart disease, with an incidence rate ratio of 3.49 compared with 1.34 in children without congenital heart disease

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