Table 2.
EEG Findings in Patients With SARS-CoV-2.
| EEG Findings | Total (N = 37) n/Total (%) | No Recent Sedation (n = 10) n/Subset (%) | Receiving Recent Sedation (n = 27) n/Subset (%) | χ2 p value |
|---|---|---|---|---|
| Any EEG Abnormality | 37/37 (100%) | 10/10 (100%) | 27/27 (100%) | 1.000 |
| Background/Rhythm Abnormalities | ||||
| Absent Posterior Dominant Rhythm (PDR) | 34/37 (92%) | 7/10 (70%) | 27/27 (100%) | *0.022 |
| Asymmetry | 4/37 (11%) | 0/10 (0%) | 4/27 (15%) | 0.488 |
| Generalized Delta Slowing | 31/37 (84%) | 7/10 (70%) | 24/27 (89%) | 0.378 |
| Generalized Theta Slowing | 31/37 (84%) | 10/10 (100%) | 21/27 (78%) | 0.260 |
| Excess, Diffuse Alpha | 6/37 (16%) | 1/10 (10%) | 5/27 (19%) | 0.903 |
| Excess, Diffuse Beta | 5/37 (14%) | 1/10 (10%) | 4/27 (15%) | 0.872 |
| Focal/Unilateral Delta Slowing | 2/37 (5%) | 0/10 (0%) | 2/27 (7%) | 0.947 |
| Focal/Unilateral Theta Slowing | 1/37 (3%) | 0/10 (0%) | 1/27 (4%) | 0.600 |
| Burst suppression with epileptiform activity | 4/37 (11%) | 0/10 (0%) | 4/27 (15%) | 0.488 |
| Burst suppression without epileptiform activity | 1/37 (3%) | 0/10 (0%) | 1/27 (4%) | 0.600 |
| EEG Unreactive | 1/37 (3%) | 0/10 (0%) | 1/27 (4%) | 0.600 |
| Intermittent brief attenuation | 8/37 (22%) | 1/10 (10%) | 7/27 (26%) | 0.552 |
| Moderately low voltage | 1/37 (3%) | 0/10 (0%) | 1/27 (4%) | 0.600 |
| Rhythmic and Periodic Patterns | ||||
| Generalized Periodic Discharges (GPDs): Triphasic morphology absent | 4/37 (11%) | 1/10 (10%) | 3/27 (11%) | 0.617 |
| Generalized Periodic Discharges (GPDs): Triphasic morphology present | 8/37 (22%) | 2/10 (20%) | 6/27 (22%) | 0.761 |
| Stimulus-induced rhythmic, periodic, or ictal discharges (SIRPIDs) | 3/37 (8%) | 0/10 (0%) | 3/27 (11%) | 0.673 |
| Lateralized Periodic Discharges (LPDs) | 0/37 (0%) | 0/10 (0%) | 0/27 (0%) | n/a |
| Generalized Rhythmic Delta Activity (GRDA) | 5/37 (14%) | 1/10 (10%) | 4/27 (15%) | 0.872 |
| Lateralized Rhythmic Delta Activity (LRDA) | 1/37 (3%) | 0/10 (0%) | 1/27 (4%) | 0.600 |
| Sporadic Discharges | ||||
| Focal | 1/37 (3%) | 0/10 (0%) | 1/27 (4%) | 0.600 |
| Multifocal | 6/37 (16%) | 2/10 (20%) | 4/27 (15%) | 0.903 |
| Generalized: Triphasic morphology present | 9/37 (24%) | 1/10 (10%) | 8/27 (30%) | 0.421 |
| Generalized: Triphasic morphology absent | 8/37 (22%) | 1/10 (10%) | 7/27 (26%) | 0.552 |
| Seizure Activity | ||||
| Discrete Seizures: Generalized | 0/37 (0%) | 0/10 (0%) | 0/27 (0%) | n/a |
| Discrete Seizures: Focal | 0/37 (0%) | 0/10 (0%) | 0/27 (0%) | n/a |
| Nonconvulsive Status Epilepticus: Generalized | 1/37 (3%) | 0/10 (0%) | 1/27 (4%) | 0.600 |
| Nonconvulsive Status Epilepticus: Focal | 0/37 (0%) | 0/10 (0%) | 0/27 (0%) | n/a |