Table 2.
Ictal onset patterns (IOP)
| Characteristic | PAO | LSP1 | LSP2 | |
|---|---|---|---|---|
| Morphology [n (%)] | Rhythmic theta | 161 (53.1) | 39 (17.4) | 6 (10.7) |
| RD | 45 (14.9) | 24 (10.7) | 10 (17.9) | |
| RS/Sh and W | 34 (11.2) | 145 (64.7) | 35 (62.5) | |
| Other rhythms (RA, FA, BA) | 63 (20.8) | 16 (7.1) | 5 (8.9) | |
| Duration (s) [median (min-max)] | 13 (0.5-120) | 32 (1-273) | 34.5 (3-196) | |
| Lateralization [n (%)] | 228 (75.5) | 132 (60) | 29 (51.8) | |
| Mean lateralization per patient | 78.9 | 58.5 | 54.8 | |
| Localization [n (%)] | 129 (56.1) | 53 (40.2) | 8 (27.6) | |
| Mean localization per patient | 49.9 | 21.1 | 15.6 | |
PAO: Pattern at onset; LSP: Late significant patterns; RD: Rhythmic delta; RS/Sh and W: Rhythmic spike/sharp and wave; RA: Rhythmic alpha; FA: Fast activity; BA: Background attenuation