We studied subsidiary laboratorial tests such as serum glucose, red blood cell count, total cholesterol, HDL and LDL cholesterol and triglycerides, electrocardiogram, electroencephalogram (EEG), cerebrospinal fluid, and CT scan of 35 patients with cerebral infarction who developed epileptic seizures (group 1 or G1), and compared them to a group of 35 patients who had cerebral infarction but have not developed epileptic seizures (group 2 or G2). The EEG analysis showed significance in the comparison between the groups; focal identification of the electrical cerebral activity was the most frequent abnormality found in G1. Extensive infarcts were also more frequent in G1. The association of abnormal EEG and extensive lesion on CT may be considered a preditive factor for occurrence of epileptic seizures after cerebral infarction. The analysis of the other tests showed no significance on the comparison between the groups.