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耳蜗血流(CBF)的变化可能为突聋的病理生理有关因素之一。该作者对怀疑外淋巴瘘4例病人行鼓室探查术中,用激光多普勒探头(LDP),置于鼓岬圆窗龛前下部测量CBF。对LDP激发和接受光纤间距离调整为0.8、0.9、1.0mm,探头外径为1.7mm,与激光多普勒血流测定仪连接。同时测定皮肤血流及心电图监控。鼓室探查发现1例圆窗膜破裂而椭圆窗正常,另3例两窗正常。为防间歇性瘘发生故均除去窗周围粘膜用组织瓣覆盖两窗。窗周中耳粘膜去除前后分别用LDP输出作比较,无粘膜探头输出较有粘膜时减少50%～80%,表明中耳粘膜影响不容忽视。LDP放于外听道孔骨部输出为0,此处骨厚度>5mm,因此测定值可
Cochlear blood flow (CBF) changes may be one of the pathophysiology of sudden deafness. The authors performed tympanometry in 4 patients suspected of having a lymphatic fistula and measured the CBF with a laser Doppler probe (LDP) in the lower anterior part of the drum niche. The LDP excitation and receiving fiber distance adjustment of 0.8,0.9,1.0 mm, the probe diameter is 1.7mm, connected with the laser Doppler flowmeter. Simultaneous determination of skin blood flow and ECG monitoring. Tympanometry found that 1 case of round window membrane rupture and oval window normal, the other three cases of normal two windows. To prevent the occurrence of intermittent fistula were removed around the mucosa with tissue flaps covered with two windows. Before and after removal of the middle ear mucosa before and after LDP output were compared for non-mucosal probe output mucosal output was reduced by 50% to 80%, indicating that the mucosal effects of the middle ear can not be ignored. LDP placed in the external auditory canal hole output 0, where the bone thickness> 5mm, so the measured value can be