On examination of a child, an innocent systolic murmur is heard at the second intercostal space left sternal border. This is usually due to:

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Innocent systolic murmurs, often heard in children, are typically caused by high flow turbulence across the heart or great vessels, not by structural abnormalities. This turbulence can occur during periods of rapid growth or increased cardiac output, such as during fever or exercise, leading to the benign nature of these murmurs.

On Examination of a Child, an Innocent Systolic Murmur Is