ABSTRACT
A number of continuous epileptiform discharges can be seen in ECoG. In a study of patients with cortical dysplasia, the frequency of spiking patterns appeared to be closely related to the outcomes of the patients, which will be described later in the chapter. In this study, three different patterns were discussed, one of which was essentially an ictal epileptiform pattern. The two other patterns may also represent an ictal pattern or a transition between ictal and interictal states due their very repetitive and rhythmic characteristics in three noted spiking patterns. Continuous or quasicontinuous rhythmic spiking consists of prolonged trains of spikes that occur rhythmic at 2-8 Hz and at times may be continuous or periodic (Figure 115.2). Repetitive bursting patterns refer to a high-frequency rhythmic polyspikes that appear suddenly and last from 5-10 seconds and then abruptly disappear. The frequency of these discharges varies from 10 to 20 Hz.11
