A heart murmur is an abnormal sound your heart makes when it beats, often sounding like a whooshing or swishing ... past the baby’s lungs before birth does not properly close after the baby ...

A murmur is an extra heart sound that can be heard by a stethoscope. Sometimes, a murmur sounds like a humming sound, which can be faint or loud. It might be temporary or persistent. Heart murmurs ...

7 According to White, 21 "marked accentuation and slurring of the first sound, such as not infrequently occurs in an overactive heart may give a semblance of a slight presystolic murmur and cause ...