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A z score (or standardized value) is measured in units of the standard deviation. It tells you how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a zero z score. It is important to note that the mean of the z scores is zero, and the standard deviation is one.
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Visual field deficits after epilepsy surgery: a new quantitative scoring method.

Rick H G J van Lanen1,2, M C Hoeberigs3, N J C Bauer4

  • 1Faculty of Health Medicine and Life Sciences, Maastricht University, Maastricht, The Netherlands. rick.van.lanen@mumc.nl.

Acta Neurochirurgica
|April 7, 2018
PubMed
Summary
This summary is machine-generated.

A new method quantifies visual field deficits (VFDs) after anterior temporal lobectomy for epilepsy. Larger resections correlate with higher VFD, particularly on the right side.

Keywords:
EpilepsyPerimetryQuadrantanopiaTemporal lobectomyVisual field deficits

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Area of Science:

  • Neurosurgery
  • Ophthalmology
  • Epilepsy Research

Background:

  • Anterior temporal lobectomy (ATL) for drug-resistant epilepsy often causes visual field deficits (VFDs), typically homonymous contralateral upper quadrantanopia.
  • The incidence of VFDs post-ATL ranges widely from 15% to 90%.
  • A quantitative method for assessing postoperative VFDs in static perimetry is currently lacking.

Purpose of the Study:

  • To develop and assess the feasibility of a novel quantitative scoring method for evaluating postoperative VFDs.
  • To enable comparison of VFDs between patient groups based on surgical parameters.

Main Methods:

  • Fifty-five patients with drug-resistant temporal lobe epilepsy (TLE) undergoing ATL were included.
  • Pre- and postoperative perimetry data were collected and analyzed.
  • Temporal lobe resection length was measured, and percentage VFD was calculated for different visual field quadrants.

Main Results:

  • A significant correlation was found between larger resection size (≥45 mm) and higher VFD for right-sided ATL (p=0.04).
  • Left-sided ATL showed more VFD in the right eye compared to the left (p=0.03).
  • A significant quantitative correlation between VFD and resection size was demonstrated for right-sided ATL (r=0.52, p<0.01).

Conclusions:

  • A new quantitative scoring method for postoperative VFD assessment after ATL for TLE has been developed and validated.
  • The study confirms a significant correlation between VFD and resection size, especially for right-sided ATL.