8.Venous hum is accentuated by deep inspiration in most patients and may be obliterated by the Valsalva maneuver or by pressure on the internal jugular vein.

• 多数病人在深吸气时静脉嗡鸣音明显，用瓦尔萨尔瓦手法或按压颈内静脉即或消除。