Infrasound Effects on Endolymphatic Hydrops.

概要

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Infrasound below 50 Hz at 100 to 110 dB SPL, generated by an instrument for ear drum massage, was applied for 60 sec. through a rubber tube to each ear canal in 14 normal adults and 25 patients with endolymphatic hydrops.<BR>The normal group showed no notable increase in the area of body sway or in nystagmus during infrasound application. The mean value of the sway area in the hydrops group showed no marked difference from that of the normal group or between before and during infrasound application; however, 17.6% and 11.8%, respectively, had a marked increase in the sway area and in horizontal nystagmus toward the exposed side during exposure to infrasound.<BR>This study confirms that some patients with certain features of endolymphatic hydrops may manifest infrasound effects on vestibular function.
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