POWER SPECTRUM ANALYSIS OF ABNORMAL ENG

Two hundred and eight copies ENG recorded during Barany’s test with 20℃water irrigation method were selected for power spectrum analysis. Their diagnosis were determined or confirmed by operation and pathological examination ahead. The results indicated that: in normal cases, the maximum amplitude frequency (Famax) should be over 1 Hz; the difference of Famax between two ears should be less than 1 Hz; the spectrum histogram should display as form "∧" ; the frequency components should be abundant and mostly distributed within 8 Hz as well. If the Famax was less than 0.5Hz, the difference of Famax was over 1 Hz, the histogram showed as "L" form, the frequency components decreased significantly or even disappeared, a function reduce or loss of inner ear or Ⅷnerve would be suggested.