The EEG Profile of an Outpatient Adult EEG Laboratory of one of the Reference Epilepsy Center in Turkey

Abstract

Objectives:EEG training can be provided during neurology residency and in PhD, observership or fellowship programmes after residency in Turkey. In this study, we aim to reveal the EEG profile of a reference epilepsy center which provides EEG training in Turkey, by evaluating our patients’ clinical data and EEG findings within three months.Methods:The patients’ clinical data and EEG findings were retrospectively assessed and categorized in groups. EEG recordings that have multiple EEG findings (both focal slowing and interictal epileptic abnormality) were added into each group. EEGs with NCSE, clinical or subclinical ictal recordings, PNES and arrhythmias were noted.Results:Most of the 867 EEGs (56.2%) were performed for epilepsy. Three hundred thirty-six of the EEG recordings (39%) had normal findings while the rest had minimum one abnormal findings. One hundred ninety of the EEG’S (22%) had interictal epileptic discharges, 198 EEGs (23%) had focal or hemispheric slowing, 358 EEGs (41%) had non-specific findings. Fifteen (2%) EEGs had ictal recordings and 19 (2%) had NCSE. NCSE was found in 26% of patients presenting with altered consciousness. Habitual seizures were present with verbal induction in 3/11 patients diagnosis with PNES. Arrhythmia was found 4%.Conclusion:The most common reason to perform a routine EEG is epilepsy. The NCSE, ictal recordings, PNES and arrhythmias are not rare in an outpatient EEG laboratory. NCSE can be observed in 1/4 of patients who underwent EEG recording due to altered consciousness. This study reveals a cross-sectional profile of the reference hospital. EEG training would be provided with experienced specialists by interpreting quantitatively and qualitatively adequate EEGs.

Keywords

• eeg training
• arrhythmia in eeg
• ictal eeg
• ncse
• pnes
• outpatient eeg