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. 2016 Aug 30;87(9):935–944. doi: 10.1212/WNL.0000000000003034

Figure 3. Epoch 1: Periodic discharges mimicking electrographic seizures on quantitative EEG (QEEG).

Figure 3

This epoch contained frequent, brief lateralized periodic discharges (LPDs) over the right temporal region that were occasionally nonevolving (black arrows), but often evolved into electrographic seizures (red arrows). The QEEG signature seen at the time of nonevolving periodic discharges (black arrow/event A; raw EEG panel A) is very similar to the QEEG pattern seen during the ictal pattern (red arrow/event B, raw EEG panel B). One of 3 raw EEG without QEEG reviewers labeled all electrographic seizures as LPDs alone. Automated seizure detection identified very few of the electrographic seizures. (Note that seizure detection algorithm trend [“seizure probability” at the top of the figure] is included here for comparison, but was not visible to quantitative EEG alone or quantitative EEG with raw EEG reviewers).