Relative value of the inion and mid-parietal locations as additional recording sites in pattern reversal visual evoked potentials

  • Beydoun A
  • Drury I
  • Vanderzant C
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Abstract

Although the P100 response of pattern reversal visual evoked potentials (PRVEPs) is most commonly recorded from the midline occipital site (MO), the response at this location can occasionally be absent or poorly defined due to anatomical variability of the visual cortex. In these cases, the American Electroencephalographic Society Evoked Potential Guidelines recommends recording from the mid-parietal (MP) and Inion electrode sites. In this study, we compared the amplitude of the P100 component recorded simultaneously from MO, MP and the Inion. PRVEPs obtained following stimulation with 30' check sizes from 155 consecutive patients (310 eyes) over a 2 year period were analyzed. At each of the 3 recording sites, the peak amplitude of P100 was calculated as N75-P100, p100-N145, and the sum of N75-P100 and P100-N145. There was a statistically significant difference between the electrode sites for all 3 methods of amplitude measurement (one- way ANOVA; P< .0001). For each method of measurement, there was no significant difference between P100 amplitude at MO or the Inion, but a significantly reduced amplitude at MP compared to both the MO and Inion electrode sites (post hoc Scheffe, P

Author-supplied keywords

  • Amplitude
  • P100
  • Pattern reversal
  • Topography
  • Visual evoked potentials

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Authors

  • Ahmad Beydoun

  • Ivo Drury

  • Chris Vanderzant

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