Acute symptomatic seizures due to metabolic derangements in pediatrics

Abstract

Abstract Background: Seizures due to an underlying metabolic abnormality form an important subset of acute symptomatic seizures in that they are treatable and do not require long-term anticonvulsants. The objective of this study is to determine the clinical and etiological profile of children with metabolic seizures. Materials and Methods: A prospective observational study done in children admitted with acute symptomatic seizures who had an underlying metabolic abnormality as the cause of seizures from January 2018 to December 2019 in a tertiary care hospital of South India. Demographic and clinical parameters were noted and relevant investigations including biochemical, neuro imaging, cerebro spinal fluid analysis, electro encephalography were carried out accordingly. Results: Among 1256 children admitted with new onset seizures, 408 (32.5%) had acute symptomatic seizures exclusive of febrile seizures and unprovoked seizures, of which 46 (3.7%) were found to have an underlying metabolic abnormality and were analyzed. The ratio of male to female was 1.4:1 and the peak age was infancy, accounting for 62.5%. The leading causes of metabolic seizures included hypocalcemia in 28 (60.9%), hypoglycemia in 16 (34.8%), and hyponatremia in 2 (4.3%). Vitamin D deficiency in 21(75%) was found to be the commonest cause for hypocalcemia, followed by hypomagnesemia, hypoparathyroidism, osteopetrosis, and renal failure. The various causes of hypoglycemia were Addisons disease in 6(37.5%), hyperinsulinemic hypoglycemia, idiopathic ketotic hypoglycemia, glycogen storage disorder, and fatty acid oxidation defect, congenital adrenal hyperplasia, and Laron syndrome. Both children with hyponatremia were diagnosed as congenital adrenal hyperplasia. Conclusion: Metabolic seizures accounted for 3.7% of new onset seizures and 11.3% of acute symptomatic seizures in our study. Hypocalcemia (60.9%) was found to be the commonest cause of metabolic seizures in children with the majority due to vitamin D deficiency (75%). Addison’s disease (37.5%) was found to be the common cause for hypoglycemia. It is reasonable to estimate serum calcium, magnesium, electrolytes, and glucose in all children presenting with new onset seizures.