Repetitive activites, dissimilar to its background rhythm, from one region are the well-known ictal EEG patterns of the partial seizure.
It is, however, vey difficult to obtain ictal scalp EEG of the partial seizure. So there have been only a few studies about this.
Authors analyzed ictal scalp EEGs of 25 patients to get the useful diagnostic aids in localizing and confirming the foci fo the partial seizure.
The causes of partial seizure were diverse. But idiopathic seizure was most common (10 patients, 40%). 19(76%) patients showed clinical seizure. But there was no clinical seizure in 6(24%) patients.
There are a lot of ictal transformations. Initiation with rhythmic θ activity was the most common finding : initiation with rhythmic θ activity was 7(28%), α activity was 4(16%), β-activity was 1(4%), mixed waves was 5 (205), and repetitive
epileptiform potentials (REPs) was 5 (20%).
These ictal scalp EEG patterns of the partial seizure, even though it is not conclusive yet, can be used as a very helpful diagnostic measure in detection of the foci and diagnosis of the partial seizure.
|