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Dr Ramakrishnan noted in one patient an increase in intensity of the venous hum of the Cruveilhier-Baumgarten syndrome following an oral glucose load. I have also noted an increase in the hum following meals, but this has not been consistent in every patient. Likewise, I have found that pressure on the abdomen increases the intensity of the hum in some patients and decreases it in others.It is important to remember that the venous hum of the Cruveilhier-Baumgarten syndrome may vary from patient to patient and in even the same patient, depending on the collateral circulation involved, the position of the patient, the cardiac output, the presence or absence of ascites, and the cardiac and respiratory cycles. Interplay of these various factors may make the response of the hum of the Cruveilhier-Baumgarten syndrome to maneuvers, such as Valsalva's maneuver, unpredictable.
Hardison JE. Venous Hum of the Cruveilhier-Baumgarten Syndrome-Reply. Arch Intern Med. 1978;138(5):826. doi:10.1001/archinte.1978.03630290106044