Machine noise

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The machine noise is a faulty background noise of the heart , which is audible during auscultation of the heart. It is a concise flow noise that can be heard over the duration of the entire phase of the heart's action, i.e. during contraction and relaxation ( systole and diastole ). It is elongated, rumbling and throbbing and reaches its maximum volume in late systole.

The cause of this background noise is flow turbulence due to a lack of or incomplete regression of the ductus arteriosus (botalli), which in the fetus is a connection between aorta and pulmonary artery that bypasses the pulmonary circulation . During cardiac auscultation, the machine noise is heard most clearly at the level of the so-called hereditary point , i.e. in the third intercostal space on the left parasternal.

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