Adverse effects on EEG and clinical condition after immunizing children with convulsive disorders

Area of Science:

• Neurology
• Pediatrics
• Immunology

Background:

• Febrile seizures and epilepsy are common in childhood.
• Immunizations are a critical part of pediatric healthcare.
• Assessing vaccine safety in children with pre-existing neurological conditions is important.

Purpose of the Study:

• To evaluate the impact of various immunizations on electroencephalogram (EEG) findings in children with a history of febrile convulsion or epilepsy.
• To determine if specific vaccines trigger adverse neurological events or alter EEG patterns in this vulnerable population.

Main Methods:

• A cohort of 61 children with febrile convulsion or epilepsy, seizure-free for at least one year, received 116 immunizations.
• EEG examinations were conducted before and after immunization in 92 instances.
• Vaccines administered included Japanese encephalitis, measles, mumps, rubella, diphtheria, acellular pertussis and tetanus (DPT), diphtheria and tetanus (DT), and Bacillus Calmette-Guerin (BCG).

Main Results:

• No adverse EEG effects were noted following immunizations with Japanese encephalitis, measles, mumps, or rubella vaccines.
• In contrast, 10 out of 73 immunizations with DPT, DT, or BCG vaccines showed reappearance or increase in epileptic spikes.
• One child experienced a convulsion seven days post-BCG immunization.

Conclusions:

• Certain childhood immunizations, particularly DPT, DT, and BCG, may be associated with transient EEG changes in children with epilepsy.
• While generally safe, these vaccines warrant careful consideration and monitoring in children with convulsive disorders.
• Follow-up EEG examinations are recommended after immunizing children with a history of seizures or epilepsy.