Normative Data for Peak Latencies and Amplitudes of P100 wave of Pattern Reversal Visual Evoked Potential in Central Indian Population
DOI:
https://doi.org/10.37506/ijop.v7i1.259Keywords:
Normative, Pattern reversal, Visual Evoked Potential, P100 wave, latency, amplitude.Abstract
Introduction
The visual evoked potentials (VEP s) is an important diagnostic tool used by neurophysiologist, ophthalmologist, neurologists and neurosurgeons as many neurological disorders present with visual abnormalities, particularly when the clinical signs and the results of neuroimaging methods are either non informative or non-conclusive. VEPs are produced by electrical activity of the visual cortex in response to light or pattern stimulation of the eye. It can detect functional loss in the visual pathway from retina to the visual cortex.
Aims and objectives
The study was planned to report the normative data for VEP P100 latencies and amplitude in normal subjects aged 40–60 years.
Methods
This study included 60 healthy subjects between the age group 40–60 years consisting of both males and females. VEP was recorded using pattern reversal stimulation with RMS EMG MARK II machine. P100 wave latencies and amplitudes were obtained in all the subjects to determine the normative values.
Results
In our study, normal mean value of P100 latency was 98.79 ± 5.75 milliseconds and mean P100 amplitude was 7.45 ± 1.14 microvolts.
Conclusion
The normative values for P100 latencies and amplitudes of PR-VEP in normal adults of Central India have been reported in the present study. These can be used for evaluation and interpretation of various VEP abnormalities. The normal values of VEP may be affected by technical factors related to machine and environment settings in different labs. So, each health care institution should have its own reference values according to normative data for their lab for VEP to improve the accuracy of the test.
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