How long does it take for epilepsy to become intractable? A prospective investigation

Area of Science:

• Neurology
• Pediatric Epilepsy Research

Background:

• Epilepsy intractability is a significant challenge in pediatric care.
• Understanding the temporal course of epilepsy intractability is crucial for effective management and treatment strategies.

Purpose of the Study:

• To prospectively investigate the timing of epilepsy intractability onset in children.
• To identify factors influencing the delayed onset of intractable epilepsy, particularly in different epilepsy syndromes.

Main Methods:

• Prospective cohort study of 613 children with epilepsy, followed for a median of 9.7 years.
• Epilepsy syndromes were categorized (focal, idiopathic, catastrophic, other).
• Intractability defined by drug failure and seizure frequency criteria; delayed intractability set at ≥3 years post-diagnosis.

Main Results:

• 13.8% (stringent) and 23.2% (two-drug) met intractability definitions.
• Delayed intractability occurred in 31.3% (stringent) and 27.5% (two-drug) of cases.
• Focal epilepsy showed significantly higher rates of delayed intractability compared to catastrophic epilepsy (p < 0.003).
• Quiescent periods preceded delayed intractability in 65.4-74.3% of cases.

Conclusions:

• Intractable epilepsy, especially focal epilepsy, can have a delayed onset.
• A period of remission often precedes the development of intractability.
• These findings may explain long delays in surgical referral for treatable epilepsies.