Innocent Murmur Lesson #679

patient thorax when auscultating by stethoscope

patient position during auscultation
The patient was supine during auscultation.


This recording is of an innocent murmur. Innocent murmurs are generated by normal blood flow within the heart. Blood flow turbulence creates vibrations in the heart's tissues which are then transmitted to the chest wall.

Benign, innocent murmurs are very common in children. This type of murmur is associated with non-cardiac conditions such as pregnancy, hyperthyroidism, exercise, and anemia in adults. When these conditions are treated appropriately, the systolic murmur disappears.

Use the stethoscope bell or diaphragm, auscultating over the pulmonic area. Listen for increasing sound intensity with inspiration. Innocent murmurs usually appear in early systole with low-to-mid-range-frequencies of 100-250Hz. The murmur is fairly short in duration. In this recording S1 and S2 are normal. Diastole is silent.



Innocent Murmur

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