Table 1.
Summary of relevant literature related to the present work.
| Author and year |
Number of patients |
Characteristics of the study |
Patient population | Nonconvulsive seizures | Relationship of nonconvulsive seizures with convulsive status epilepticus |
|---|---|---|---|---|---|
| DeLorenzo et al, 1998 (13) | 164 adult patients (≥16y) | Prospectivestudy. | Patients monitored with continuous EEG after resolution of convulsive status epilepticus. | 79/164 (48% developed onconvulsive seizures [23/164 14% nonconvulsive status pilepticus] after resolution of onvulsive status epilepticus | |
| McCoy et al, 2011 (12) | 121 children (60% were <1y) | Retrospectivesudy. | Patients monitored with continuous EEG in the neonatal and pediatric intensive care units. | 35/121 (29%) had nonconvulsive seizures Factors associated with nonconvulsive seizures: acute presentation of epilepsy, acute structural brain etiology, acute nonstructural brain etiology, prior diagnosis of epilepsy, and interictalepileptiform discharges on EEG | |
| Tay et al, 2006 (8) | 19 children (1mo to 17 years) | Retrospective study. | Patients with nonconvulsive status epilepticus. | 5/19 (26%) patients developed nonconvulsive status epilepticus after convulsive status epilepticus and 12/19 (63%) developed nonconvulsive status epilepticus after brief convulsions | |
| Shahwan et al, 2010 (9) | 100 children (2mo to 17y) | Prospective study. | Patients with depressed consciousness (Glasgow coma scale<8). | 7/100 (7%) had nonconvulsive seizures | 4/7 (57%) patients had convulsive status epilepticus before developing electrical seizures |
| Saengpatt rachai et al, 2006 (20) | 141 pediatric patients (> 1mo) | Retrospective study. | Patients with depressed level of consciousness. | 23/141 (16%) had nonconvulsive seizures | |
| Claassen et al, 2004 (19) | 570 patients (75 patients<18y , 41 patients<2y) | Retrospective study. | Patients with continuous EEG monitoring. | 101/570 (18%) had nonconvulsive seizures Factors associated with nonconvulsive seizures: coma, age<18y, history of epilepsy, and convulsive seizures during the current illness | |
| Abend et al, 2011 (11) | 100 children (interquartile range 0.8 to 9.7y). | Prospective study. | Patients with acute encephalopathy and EEG monitoring. | 46/100 (46%) had nonconvulsive seizures, 19/100 (19%) had nonconvulsive status epilepticus Factor associated with nonconvulsive seizure: young age | Electrographic seizures occurred in 29/56 (52%) of patients with convulsive seizures prior to EEG monitoring and in 17/44 (39%) of patients without convulsive seizures prior to EEG monitoring. |
| Schreiber et al, 2012 (18) | 94 children (1mo to 18y) | Prospective study. | Patients with acute encephalopathy (Glasgow coma scale<12). | 27/94 (29%) had nonconvulsive seizures, 17/94 (18%) had nonconvulsive status epilepticus Factors associated with nonconvulsive seizures: age<2y, and clinical seizures prior to EEG monitoring | |
| Williams et al, 2011 (10) | 122 patients (2 days to 17y) | Retrospective study. | Patients with EEG monitoring in the neonatal and pediatric intensive care unit. | 34/122 (28%) had nonconvulsive seizures | Factors associated with electrographic seizures: prior convulsive status epilepticus and epileptiformactivity[C1] |