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A heart murmur is a sound or murmur that a doctor hears with a stethiscope. Before a baby is born a hole exists between the ventricles. At birth, that hole starts closing. Normally it is completely closed in the first few years of a child's life. If it presists into adolescence, an operation may be necessary to close it, otherwise the person might get out of breath real easy.

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Q: What is a heart murmor?
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