Do serum sodium levels predict febrile seizure recurrence within 24 hours?

Area of Science:

• Pediatrics
• Neurology

Background:

• The American Academy of Pediatrics (AAP) Practice Parameter advises against routine serum electrolyte testing for children with simple febrile seizures.
• European studies suggested hyponatremia as a risk factor for febrile seizure recurrence within 24 hours, potentially altering clinical practice.

Purpose of the Study:

• To evaluate the association between serum sodium levels and the recurrence of simple febrile seizures within 24 hours in children.
• To assess whether serum electrolyte testing is warranted in the routine evaluation of febrile seizures.

Main Methods:

• Retrospective chart review of 175 children (6 months to 5 years) presenting with generalized seizures (lasting <15 minutes) in 1999.
• Patients were divided into febrile (n=136) and afebrile (control, n=39) groups.
• Serum electrolytes were analyzed for all participants; seizure recurrence within 24 hours was documented.

Main Results:

• No significant difference in mean serum sodium was found between febrile children with recurrent seizures (135.48 mmol/L) and those without recurrence (135.56 mmol/L).
• Mean serum sodium levels were significantly lower in children with simple febrile seizures (both recurrent and non-recurrent) compared to the afebrile control group.

Conclusions:

• Serum electrolyte levels, specifically sodium, do not appear to be a significant risk factor for febrile seizure recurrence within 24 hours.
• The findings support the AAP's recommendation against the routine measurement of serum electrolytes in children presenting with simple febrile seizures.