The response of the venous hum of the Cruveilhier-Baumgarten syndrome (CBS) to respiration, the cardiac cycle, and changes in posture is not predictable. The Valsalva maneuver may result in an increase in intensity of the hum rather than a decrease. The Cruveilhier-Baumgarten venous hum (CBH) is virtually diagnostic of portal vein hypertension. It may be mistaken for obscure cardiac murmurs. The Cruveilhier-Baumgarten venous hum, unlike the cervical venous hum (CVH), is never present in normal people.
(Arch Intern Med 137:1623-1624, 1977)
Hardison JE. Venous Hum of the Cruveilhier-Baumgarten Syndrome: Response to the Valsalva Maneuver. Arch Intern Med. 1977;137(11):1623–1624. doi:10.1001/archinte.1977.03630230095027
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