What Is A Heart Murmur Is A Great Question What is a heart murmur? The definition of a heart murmur is an extra or unusual sound heard when the heart beats. Basically, it sounds like the heart is humming with every beat. Most heart murmurs are considered harmless but some can be very dangerous. The two types of heart murmurs are called innocent and abnormal. An innocent heart murmur is the harmless type and is considered normal. Children born with this type of murmur usually grow out
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