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  • Title: The difficulty of diagnosing NCSE in clinical practice; external validation of the Salzburg criteria.
    Author: Goselink RJM, van Dillen JJ, Aerts M, Arends J, van Asch C, van der Linden I, Pasman J, Saris CGJ, Zwarts M, van Alfen N.
    Journal: Epilepsia; 2019 Aug; 60(8):e88-e92. PubMed ID: 31318040.
    Abstract:
    To improve the diagnostic accuracy of electroencephalography (EEG) criteria for nonconvulsive status epilepticus (NCSE), external validation of the recently proposed Salzburg criteria is paramount. We performed an external, retrospective, diagnostic accuracy study of the Salzburg criteria, using EEG recordings from patients with and without a clinical suspicion of having NCSE. Of the 191 EEG recordings, 12 (12%) was classified as an NCSE according to the reference standard. In the validation cohort, sensitivity was 67% and specificity was 89%. The positive predictive value was 47% and the negative predictive value was 95%. Ten patients in the control group (n = 93) were false positive, resulting in a specificity of 89.2%. The interrater agreement between the reference standards and between the scorers of the Salzburg criteria was moderate; disagreement occurred mainly in patients with an epileptic encephalopathy. The Salzburg criteria showed a lower diagnostic accuracy in our external validation study than in the original design, suggesting that they cannot replace the current practice of careful weighing of both clinical and EEG information on an individual basis.
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