Do auras predict seizure outcome after temporal lobe epilepsy surgery?

Area of Science:

• Neurology
• Neurosurgery
• Epileptology

Background:

• Accurate identification of the ictal onset zone is crucial for successful epilepsy surgery.
• The predictive value of auras for surgical outcomes in drug-resistant epilepsy remains underexplored.

Purpose of the Study:

• To investigate the clinicopathological correlation of auras and their role in predicting surgical outcomes in drug-resistant temporal lobe epilepsy (TLE).
• To compare surgical outcomes between TLE patients with and without auras.
• To identify clinico-pathological, radiological, and surgical differences between these groups.

Main Methods:

• Analysis of consecutive patients who underwent anterior temporal lobectomy (ATL) for drug-resistant TLE between January 2009 and December 2014.
• Follow-up assessments at 3 months, 12 months, and annually post-surgery.
• Comparison of surgical outcomes, clinico-pathological features, radiological findings, and surgical details between patients with and without auras.

Main Results:

• Out of 456 patients, 75% reported experiencing auras.
• The presence of aura was associated with prototype EEG patterns at ictal onset and a right-sided epileptogenic zone.
• No significant difference in surgical outcome was observed between patients with and without auras overall.
• However, patients experiencing auditory or vertiginous auras showed significantly poorer surgical outcomes.
• Auditory and vertiginous auras were more frequently associated with normal MRI and normal/indeterminate pathology.

Conclusions:

• The mere presence of aura does not influence surgical outcomes in TLE.
• Auditory and vertiginous auras are significant predictors of poor surgical outcomes.
• Patients with auditory or vertiginous auras may require more extensive presurgical evaluation to precisely delineate the ictal onset zone beyond standard ATL limits.