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When contracts some blood goes up through mitral valve into turbulent flow through valve causes murmur?

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A heart murmur is a condition in which abnormal heart sounds are determined with the help of a stethoscope. Normally, a heart valve makes a distinct clicking sound when it snaps shut. With a murmur, the click is replaced by a sound similar to blowing. This abnormal sound can indicate the turbulent flow of blood through a narrowed valve or backward (retrograde) flow back toward the atria then through a broken valve.

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