Role of cranial imaging in epileptic status.

INTRODUCTION: There is paucity of studies evaluating the role of cranial imaging in the management of status epilepticus (SE); therefore this study evaluates the role of imaging in predicting the outcome of SE.

METHODS: Consecutive patients with SE were prospectively evaluated. Clinical evaluation, blood counts, serum chemistry and cerebrospinal fluid (CSF) were carried out. Cranial CT scan was performed on a spiral CT and MRI on a 1.5 T scanner. Patients were treated with IV sodium valproate, phenytoin and benzodiazepines as per fixed protocol. Outcome was defined as seizure control at 1h and mortality. Various clinical and radiological parameters were correlated.

RESULTS: There were 99 patients with SE whose mean age was 35 (1-78) years, 40 females and 17 were below 12 years of age. Fifty six patients had central nervous system (CNS) infections, 15 strokes, 13 metabolic encephalopathy, 5 drug default and in the remaining 10 patients various acute symptomatic causes were present. Cranial imaging was abnormal in 59% patients. CT was abnormal in 21 (47.7%) out of 44 patients whereas MRI was abnormal in 26 (63.4%) out of 41 patients. Both MRI and CT were carried out in 14 patients and 12 revealed abnormalities; 2 had abnormality only on MRI. Imaging revealed cortical lesions in 10, subcortical in 19 and both cortical as well as subcortical in 30 patients. One hour seizure control was achieved in 60, seizures recurred within 24h in 38 and 27 patients died during hospital stay. Seizure type, duration of SE, seizure control at 1h and mortality did not correlate with radiological abnormalities.

CONCLUSION: Cranial imaging reveals structural abnormality in 59% patients with SE and was not related to SE control and mortality.