title: Peri-ictal signal changes in seven patients with status epilepticus: interesting MRI observations.
abstract: BACKGROUND
  Transient peri-ictal changes on imaging had been described following status epilepticus (SE), but its cause is not very well understood. We analyzed the magnetic resonance imaging (MRI) findings in SE patients in order to elucidate such changes including peri-ictal signal.
  
  
  METHODS
  This prospective study involved 34 patients (M/F 23:11, mean age 25.8 +/- 17.2 years) who experienced SE. MRI was performed during or within 96 h of cessation of seizures. Twenty-five patients had generalized convulsive status epilectus (GCSE; ten secondary GCSE and 15 primary GCSE). Seven patients had epilepsia partialis continua and two patients non-convulsive SE. Eight patients had a history of seizures and three patients previous SE. The mean duration of SE prior to MRI was 89.2 +/- 105.3 h (range 2-360 h). MRI provided diagnosis in 17 patients, and in 13 patients, no structural cause was identified.
  
  
  RESULTS
  Peri-ictal focal signal changes with restricted diffusion on apparent diffusion coefficient maps were present in seven (20.6%) patients with SE (generalized convulsive, three; partial, three; non-convulsive, one). The changes were observed when MRI was performed during SE in 3/10 (30%) patients, or within 24 h in 1/7 (14.3%), 48 h in 1/5 (20%), 72 h in 1/6 (16.7%), or 96 h in 1/6 (16.7%) patients after cessation of seizures. Repeat MRI revealed disappearance of signal changes in two patients.
  
  
  CONCLUSIONS
  Peri-ictal MR changes with restricted diffusion appear to be an effect rather than the cause of SE.
authors.affiliation: Department of Neurology, National Institute of Mental Health and Neurosciences (NIMHANS), Karnataka, India.
authors.forename: Manoj K
authors.initials: MK
authors.lastname: Goyal
authors.forename: Sanjib
authors.initials: S
authors.lastname: Sinha
authors.forename: Shivshankar
authors.initials: S
authors.lastname: Ravishankar
authors.forename: Jai Jai
authors.initials: JJ
authors.lastname: Shivshankar
mesh_terms: D000328:Adult; D001921:Brain / Q000473:pathology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D013226:Status Epilepticus / Q000473:pathology*