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。
2.
Due to the size of the defect , a fragment of bone is introduced to support the mucosal graft . strength of the repair is verified by increasing intercranial pressure with the valsalva maneuver , and it is seen to be watertight . rapid - setting fibrin glue is applied , and a second layer of mucosa is applied over this 由于瘘孔较大，置入一些骨的碎片以支持填塞物，通过valsalva法咽鼓管吹气法增加颅内压可以观察修补的牢固性，可以看到没有泄漏，利用可以快速固定的纤维蛋白胶进行固定，其上铺上一层粘膜，然后再用胶水进行固定。
