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Table 5 Intra-operative changes in Visual-Evoked Potential Waveforms

From: Intraoperative monitoring of visual evoked potentials in patients undergoing transsphenoidal surgery for pituitary adenoma: a systematic review

Title Unchanged VEP Improvement Temporary VEP deterioration Permanent VEP deterioration
Feng et al. (2019) [18] 73.8% 2.4% 14.3% 9.5%
Qiao et al. (2019) [19]a 24.3% 44% 30% 0
Toyama et al. (2018) [20] 53.8% 7.6% 23.1% 15.4%
Nishimura et al. (2018) [21] 77.5% n/a 16.3% 5.0%
Kurozumi et al. (2017) [22] 89.5% 5.9% 5.9% 0
Luo et al. (2015) [23] 72% 16% 20% 12%
Kamio et al. (2014) [7] 82.1% 0% 14.3% 3.6%
Houlden et al.(2014) [9] - - - 0
Chung et al. (2012) [24] 67.4% 20.0%  - 12.6%c
Sasaki et al. (2010) [6] 90.3% 0.5% 1.6% 7.5%
Chacko et al. (1996)b [25] - - 100% -
  1. VEP Visual-Evoked Potential
  2. Standard criteria for changes in VEP amplitude: Improvement > 50% increase in baseline VEP amplitude; Deterioration > 50% decrease in baseline VEP amplitude. Exceptions: a:Qiao et al > 25% increase in baseline VEP amplitude; Deterioration > 25% decrease; bChacko et al – criteria not defined
  3. cDid not report whether this deterioration was temporary or permanent