Aim of study: To study the pattern of seizures in hyperglycemic patients and its correlation with serum osmolality, blood sugar and serum sodium.
Materials and methods: (Study period June 1999-June 2000) Forty patients who presented with first time seizures and who were detected to be diabetic were included in the study. All patients had detailed history, clinical examination blood sugar, BUN, serum electrolytes, serum osmolality, serum calcium estimation. EEG and CT head scan was also done. The seizures were classified as per ILAE classification (1981). The study group was further divided into Group A--those with normal CT (n 24) and Group B-- those showing infarcts in CT scan (n 16). The control group (n 40) were matched for age and had first occurrence of seizures and CT showed infarct and were euglycemic. All the investigations were done for the control group as well. Statistical analysis was done using ANOVA.
Results: None of the patient had diabetic ketoacidosis. Patients in study group had statistically significant incidence of (1) Focal seizures with or without generalisation (100%); (2) Visual hallucination (25%); (3) Epilepsia partialis continua (20%). Comparing the subgroups (A and B) complex partial seizures and visual hallucination was significant at 5% level in the group A (NKH with normal CT). Ninety percent in the study group had increased serum osmolality (Vs 22.5% in the control group). Duration (eight days Vs 1) and frequency (15 per day vs 1.45) were positively correlated with RBS > S.osmolality > S.sodium.
Conclusion: 1. Long duration and frequent focal motor seizures with or without secondary generalisation occurs in NKH which at times may be the first manifestation of DM. 2. Complex partial seizures, visual hallucination and epilepsia partialis continua are more common in NKH patients than in euglycemic patients. 3. There is positive correlation of blood sugar, S.osmolality and S.sodium with frequency and duration of seizures. RBS > S.osmolality > S.Na. 4. Correction of hyperglycemia is the main stay of management of seizures. 5. Movement induced seizures which is specific for NKH is a rarity.