Nihon Jibiinkoka Gakkai kaiho
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Nippon Jibiinkoka Gakkai Kaiho · Aug 1995
Case Reports[Measurement of cochlear blood flow during exploratory tympanotomy in patients suspected of having perilymphatic fistulas].
Since impairment of cochlear blood flow is one of the factors implicated in the pathophysiology of sudden deafness, we measured cochlear blood flow in nine patients suspected of having perilymphatic fistulas. All but one patient had sudden sensorineural hearing loss. The exceptional case had experienced rotatory vertigo immediately after nose-blowing. ⋯ Pulsatory movement of the laser-Doppler output was observed in all 9 patients even after the middle ear mucosa had been removed. We attempted to measure the effects of carbon dioxide on cochlear blood flow, using methods such as inhalation of carbogen and cessation of respiration. In most cases, however, no significant change in cochlear blood flow was observed with these procedures.