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In the newborn population, the prevalence of heart murmurs is between 0.6% and 4.2%.Among infants and children, an estimated 90% will have a heart murmur at some point during their infancy or childhood. Approximately 50% to 70% of infants and children are reported to have a heart murmur identified during a routine physical exam, but of all pediatric heart murmurs, less than 1% are caused by a congenital heart defect. About 70% of heart murmurs are asymptomatic in infants and children, and asymptomatic murmurs may be either innocent or pathologic.

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13y ago

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