Cochlear Blood Flow: Effect of Noise

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Abstract
• Cochlear blood flow as investigated in anesthetized gerbils exposed to high-frequency (10 to 40 kHz), high-intensity (113 dB sound pressure level noise for 13 minutes. Blood flow was measured using a newly developed technique, which combines the surface preparation dissecting of the cochlea with the microsphere method. Our experiments indicate that shortlasting, high-intensity noise exposure causes a highly significant elevation of the blood flow in noise-exposed inner-ear areas. On the exposed side, blood flow increase was observed in the first turn of the stria vascularis–suprastria and basilar membrane–lamina spiralis ossea. On the opposite side, which was exposed only through bone conduction, blood flow was significantly elevated only in the basilar membrane. (Arch Otolaryngol 1983;109:611-615)

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