Table 2:
Conventional EEG Abnormalities
| Participant | No PDR | Slow PDR | Focal Irregular Slowing |
Generalized Irregular Slowing | Generalized Rhythmic Slowing | No Reactivity | Low Amplitude |
|---|---|---|---|---|---|---|---|
| 1 | X | X | |||||
| 2 | X | X | |||||
| 3 | X | ||||||
| 4 | X | X | X | ||||
| 5 | X | X | X | ||||
| 6 | X | X | |||||
| 7 | X | X | X | X | |||
| 8 | X | X | |||||
| 9 | X | X | X | ||||
| 10 |
Presence of common EEG abnormalities on visual inspection. Ratings required agreement by at least two clinical neurophysiologists. All but one study had background slowing (generalized irregular slowing or slow PDR). None of this cohort of patients had focal rhythmic slowing, triphasic waves, burst suppression, interictal epileptiform discharges or seizures. One participant (4) did have normal sleep architecture – this EEG was recorded for 2.5 hours. PDR: Posterior Dominant Rhythm