Relationship of the Pattern- reversal Visually Evoked P100 Wave Latency, Amplitude and duration to Head Size and Height

Jayshree Phurailatpam; Arun Kumar Sharma; Ramji Singh; Smita Singh

doi:10.5530/ijcep.2018.5.3.6

Jayshree Phurailatpam Associate Professor, Department of Physiology, Regional Institute of Medical Sciences, Imphal, Manipur, INDIA.
Arun Kumar Sharma Medical Physicist, Department of Radiotherapy, Regional Institute of Medical Sciences, Imphal, Manipur, INDIA.
Ramji Singh Professor, Department of Physiology, All India Institute of Medical Sciences, Patna, Bihar, INDIA.
Smita Singh Professor, Department of Ophthalmology, Mahatma Gandhi Institute of Medical Sciences, Sewagram, Maharashtra, INDIA.

DOI: https://doi.org/10.5530/ijcep.2018.5.3.6

Keywords: P100latency, Amplitude, Duration, Occipitofrontal circumference, Height, Indians

Abstract

Background and Aim: Transient Pattern-Reversal Visual Evoked Potentials (t-PRVEPs) used in evaluation of many neurological disorders are documented to be influenced by age, sex and body size and are best recorded over the occipital region. Methods: The present study has investigated the influence of head size and height on the main component P100 peak latency, amplitude and duration in Indian population. Occipito-frontal circumferences, heights of 146 healthy normal volunteers aged 1-75 years were measured and t-PRVEPs latency, amplitude and duration of P100 waveform of each eye (292 monocular tracings) recorded. Results: Results indicate that OFC and height of the individual correlates positively with the P100 latency and duration but negatively with its amplitude. Conclusion: In the 1st decade of development, P100 latency increases at a rate of around 2.3ms/cm increase in OFC and the most significant changes with respect to OFC and height are on the P100 amplitude contributing about 39% and 45% each respectively.