Scalp video EEG results and further choices according to the new classification of the patients (see text)
| Neurophysiological presurgical study: scalp EEG | Further step | |||
|---|---|---|---|---|
| Interictal | Ictal | |||
| ant, anterior; c, central; EEG, electroencephalogram; f, frontal; ic, intracerebral; L, left; o, occipital; p, parietal; post, posterior; R, right; S, spike; S-W, spike and waves; t, temporal. | ||||
| Case 1 | Video EEG: one seizure | Normal background activity | L ant and mid temporal rhythmic theta activity, temporal S-W diffused to central area | Surgical intervention |
| L temporal theta diffused to frontal | ||||
| L temporal S-W | ||||
| Case 2 | Video EEG: two seizures | Normal background activity | Low voltage fast activity predominant in R f-t, rhythmic slow S at 1 Hz, predominant in R f-t | Surgical intervention |
| Monomorphic delta in mid-temporal lead | ||||
| S, poly S, S-W in R ant and mid-temporal lobe | ||||
| Case 3 | Video EEG: one seizure | Normal background activity | Flattening in R temporal, diffusing to f-c, recruiting S-W at 2 Hz in R f-t region | Surgical intervention |
| Spike activity in R f-c-t lobes | ||||
| Case 4 | Video EEG: no seizure | Slow L background activity | – | Surgical intervention |
| Slow waves in L c-p-t | ||||
| S-W, poly S-W in L c-p, sometimes R | ||||
| Case 5 | Video EEG: seven seizures | Slow background activity | Irregular delta waves, flattening, low voltage recruiting fast activity in L ant frontal region | Stereo EEG: 12 ic electrodes in R f-t |
| Delta activity in L f-c | ||||
| S, poly S, poly S-W in L f-c | Seizures: 9 spontaneous, 19 with stimulation | |||
| CoA (case 6) | Video EEG: three series of spasms | Absence of background activity | Fast diffused flattening with rhythmic fast activity and low voltage fast activity in L frontal region | Stereo EEG: 11 ic electrodes in L f-c |
| Bilateral f-c-t delta with diffusion | Seizures: 12 spontaneous, 4 with stimulation | |||
| Focal S and S-W on L f-c region with diffusion to R f-c | ||||
| 12 Hz rhythmic activity | ||||
| Case 7 | Video EEG: four series of spasms | Slow background activity | Diffused low voltage fast activity, predominant in L post region | Stereo EEG: 12 ic electrodes in L t-o-p |
| Continuous delta activity in L t-o | ||||
| S, S-W, poly S-W in L f-c-t | Seizures: 8 spontaneous, 5 with stimulation | |||
| Case 8 | Video EEG: eight seizures | Slow background activity | Low voltage fast activity in R f-c-t, high voltage slow waves in t-p, then recruiting activity | Stereo EEG: 11 ic electrodes in R c-p |
| Continuous delta activity in R hemisphere | ||||
| S, S-W in R hemisphere | Seizures: 15 spontaneous, 4 with stimulation | |||
| Case 9 | Video EEG: seven seizures | Slow L background activity | Rhythmic slow waves in L f-c, diffuse flattening predominant in L f-c | Stereo EEG: 13 ic electrodes in L f-c |
| Multifocal L slow S | ||||
| Seizures: 3 spontaneous, 10 with stimulation | ||||
| Case 10 | Video EEG: six seizures + one status of minor motor episodes | Slow background activity | Diffused attenuation followed by low voltage fast activity in R f-c-t region, rapid S-W mainly in R ant frontal region | Stereo EEG: 10 ic electrodes in R f-t |
| Slow waves in R frontal diffusing to L ant | ||||
| Seizures: 1 spontaneous + status of minor motor episodes | ||||