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Reference.org
Functional murmur
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<p>A functional murmur (innocent murmur, physiologic murmur) is a <a href="/facts/Heart_murmur/dTnJK96Q">heart murmur</a> that is primarily due to physiologic conditions outside the heart, as opposed to structural defects in the heart itself. Serious conditions can arise even in the absence of a primary heart defect, and it is possible for peripheral conditions to generate abnormalities in the heart. Therefore, caution should be applied to use of the terms "innocent" or "benign" in this context.Use of the term dates to the mid 19th century. </p>