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Baysal Kıraç, Leyla; Rémi, Jan; Hartl, Elisabeth; Loesch, Anna Mira; Vollmar, Christian; Noachtar, Soheyl (2016): Interictal Rhythmic Midline Theta Rhythm is Common in Frontal Lobe Epilepsy But Not Specific to Any Subcompartment. In: Journal of Neurological Sciences-Turkish, Vol. 33, No. 2: pp. 207-213
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Abstract

Purpose: The objective was to investigate whether rhythmic midline theta (RMT) is more common in mesial frontal lobe epilepsy (FLE) than in other FLEs. Methods: We reviewed our data base and included 19 patients with medically refractory FLE who underwent invasive evaluation for epilepsy surgery in the study. In all patients noninvasive EEG-video recordings have been performed prior to the invasive studies. Interictal RMT due to drowsiness was excluded. Results: RMT was observed in surface EEGs of 13 of 19 (68 %) FLE patients. The rate of RMT was as common in mesial frontal (6 of 8 patients;75 %), orbitofrontal (4 of 5 patients, 80 %) and dorsolateral frontal (2 of 3 patients;67%) seizure onset (p=0.9). RMT was observed in surface EEGs of 4 of 5 (80 %) patients who showed majority of the interictal epileptiform discharges (IEDs) in the temporal lobe region. Conclusions: Interictal RMT is common in patients with FLE and does not seem to have an association with a subcompartment of the frontal lobe. RMT is particularly valuable as a marker for frontal lobe epileptic dysfunction in patients whose IEDs dominate outside the frontal lobe.