144:, which may be a symptom of a potentially serious condition. The difference is easily detected by placing light pressure on the internal jugular vein when listening to the heart, which will immediately abolish or change the venous hum, whereas a true heart murmur will be unaffected by this maneuver. The murmur also disappears when the patient is in the
110:, usually more obviously on the right side than on the left. The sound may radiate to the upper sternal border on either side. Though the exact mechanism is still unclear, it has been suggested that the hum occurs when otherwise silent laminar flow through the internal jugular vein is disturbed by deformation of this vessel at the level of the
160:, by augmenting blood flow through the jugular veins, can nonetheless initiate or reinforce the venous hum, making it more noticeable, and manipulation of the sound with various maneuvers has often helped physicians discover and diagnose cardiovascular disorders.
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While a venous hum may provoke consultation with a healthcare professional, the hum itself is entirely harmless and is the product of ordinary cardiac physiology. Abnormal and potentially serious conditions such as
129:. It may be easier to hear when sitting, when the chin is elevated, or when the head is rotated contralaterally (away from the location of the sound); deep inspiration and hyperkinetic circulatory states (e.g.
137:. It is by far the most common type of normal continuous murmur, universal in healthy children, and frequently present in healthy young adults, especially during pregnancy.
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or may disappear if the subject turns their head to one side. It is also known by the names "nun's murmur" and "bruit de diable" (noise of devils).
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Hardison, Joseph E. (14 March 1968). "Cervical Venous Hum: A Clue to the
Diagnosis of Intracranial Arteriovenous Malformations".
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Cutforth, Robert; Wiseman, Josephine; Sutherland, R.D. (October 1970). "The genesis of the cervical venous hum".
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can cause the vein walls to vibrate, creating a humming noise which can often be heard by the subject.
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Typically, a peculiar humming sound is heard in the upper chest near the
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Braunwald, Eugene; Zipes, Douglas P.; Libby, Peter, eds. (2001).
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Medical
Education for Visual Learners - Cervical Venous Hum
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phenomenon caused by the normal flow of blood through the
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Heart disease: a textbook of cardiovascular medicine
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