Comparing two classification schemes for seizures and epilepsy in rural China

Area of Science:

• Neurology
• Epileptology

Background:

• The International League against Epilepsy (ILAE) revised its classification systems for seizures and epilepsies in 2017.
• Previous classifications from the 1980s are still widely used, particularly in resource-limited settings.

Purpose of the Study:

• To compare the diagnostic classifications of epilepsy using the 1980s ILAE system versus the updated 2017 ILAE system.
• To identify discrepancies in seizure type, epilepsy syndrome, and etiology classification in a rural Chinese population.

Main Methods:

• Individuals with epilepsy from rural China were recruited.
• Seizures and epilepsy syndromes were initially classified using the 1980s ILAE criteria.
• The same individuals were then re-classified using the 2017 ILAE criteria.
• Differences in classification outcomes were analyzed.

Main Results:

• Complete agreement was observed between the 1980s and 2017 classifications for focal seizures (525 individuals).
• A significant increase in 'unknown' classifications was noted for generalized seizures (from 1.2% to 2.8%) and epilepsy etiology (from 32% to 39%) under the 2017 system.
• The proportion of individuals with unknown seizure types and epilepsy also increased.

Conclusions:

• The 2017 ILAE classification system demonstrates high concordance with the older system for focal epilepsy in this cohort.
• However, the updated classification leads to a significant rise in undetermined seizure types, epilepsy syndromes, and etiologies in rural China.
• These findings underscore the necessity for enhanced clinical assessment and diagnostic capabilities for epilepsy management in resource-poor regions.