Still's Murmur Recording & Waveform | Eko Health

Still's murmur is the most common benign murmur, impacting 1 in 3 children. It occurs in the pediatric population and is typically discovered between 2 and 7 years of age. The most common age of a patient with Still's murmur is 3 years. There's no correlation with patients' gender. There are no medical consequences of not treating Still's murmur; it resolves on its own by adolescence and it does not carry any unwanted medical consequences.
Pathophysiology
There is no clear explanation of the pathophysiology of Still's murmur. It's believed that it's caused by rapid blood flow via the normal aortic valve by increased cardiac output or increased contractility of the heart muscle. There are also other theories of the mechanisms of creating the murmur including the potential presence of fibrous bands or false tendons in the left ventricle, which can cause a vibration of the blood. Also, the presence of a smaller aortic root size, which becomes a partial obstruction for blood to move via the aortic valve, can form Still's murmur. With so many speculations there is still no clear agreement on how the murmur is being formed.
Audio
Still’s murmur is a brief, low-pitched, vibratory, 1-3 midsystolic crescendo-decrescendo murmur without snaps or clicks. The sound of the murmur does not worsen or change with time and the child’s growth. Still’s murmur is best heard at the left lower sternal border with the possibility of radiation to the apex. It's loudest in the supine position and best heard with the bell of the stethoscope.
ECG
There are no specific changes on the ECG for Still's murmur.
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MKT-0002464 Rev 1.0

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Is this from the Eko Core 500 or the Core Digital stethoscope?