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Academia Mexicana de Neurología, A.C.

2012, Number 6

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Rev Mex Neuroci 2012; 13 (6)

Interobserver variability in EEGs reading by using a Cleveland Clinic Foundation standardized electroencephalographic scale

Miranda-Nava G, Shkurovich-Bialik P, Ortega-Ponce F

Language: Spanish
References: 30
Page: 306-313
PDF size: 242.75 Kb.


ABSTRACT

Introduction: The EEG is possibly the most frequently performed procedure in the study of neurological patients, but its diagnostic value depends on the person who interprets the study. This may vary depending on factors such as the experience of the interpreter, mode of study observation (digital screen or printed), and patients’ clinical presentation, often leading to inherent flaws in diagnosis and prognosis. Objective: To analyze the interobserver variability between different physicians, certified neurologists and neurophysiologists, for reading conventional electroencephalogram, using the scale of the Cleveland Clinic Foundation. Methods: A random quota sampling was performed. Of the 93 EEGs observed during the study period, 31 were selected. Subsequently 3 neurologists and 3 neurophysiologists, had they were asked to interpret the selected EEGs, which consisted of 10 sheets, with sensitivity 7 µV/mm and speed of 10 seconds per page. Each clinician had a maximum of 2 min per study for interpretation and qualification. Results: Only 9 (29%) of the EEGs were classified as normal. It was found a slightly higher agreement among neurophysiologists (from 0.64 to 0.82) than among neurologists (from 0.64 to 0.72) in the classification of EEGs. Conclusions: Wide interobserver variability was found for the classification of EEGs, with differences according to the specialty of examining physicians.


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