Humming is as effective as Valsalva's maneuver and Trendelenburg's position for ultrasonographic visualization of the jugular venous system and common femoral veins.

Lewin MR, Stein J, Wang R, Lee MM, Kernberg M, Boukhman M, Hahn IH, Lewiss RE. Humming is as effective as Valsalva's maneuver and Trendelenburg's position for ultrasonographic visualization of the jugular venous system and common femoral veins. Ann Emerg Med. 2007 Jul; 50(1):73-7.

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