Venous hum

Medical condition

Venous hum is a benign auscultatory phenomenon caused by the normal flow of blood through the jugular veins. At rest, 20% of cardiac output flows to the brain via the internal carotid and vertebral arteries; this drains via the internal jugular veins. The rush of blood from these veins to the brachiocephalic vein can cause the vein walls to vibrate, creating a humming noise which can often be heard by the subject.

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