Integrating the cognitive sequelae after temporal lobe surgery into daily life: a mixed methods approach to the consequences of average to severe memory decline
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Background
Temporal lobe epilepsy surgery (TLS) is an effective treatment for drug-resistant focal epilepsy but is often associated with cognitive decline. A key unresolved question is how to distinguish average from severe memory loss and how these levels differentially affect everyday life. We addressed this question applying patient-derived norms of memory decline and conducting qualitative interviews with patients experiencing expected or unexpectedly severe memory loss.
Methods
Regression-based normative change criteria for postoperative verbal memory loss were derived from a single-center cohort of 806 patients. Two matched groups of four patients each were selected from the severe memory decline (SMD; below the 5th percentile) and average memory decline (AMD; 20 th – 75 th percentile) ranges. In-depth, semi-structured narrative interviews were analyzed using qualitative content analysis with a combined deductive-inductive approach.
Results
AMD narratives emphasized recovery, with surgery integrated into a continuing sense of self. In contrast, SMD descriptions focused on persistent symptoms, continued treatment, and illness despite meaningful seizure reduction. Patients with SMD also reported limited information, insufficient psychological preparation or postoperative cognitive rehabilitation.
Conclusions
Whereas AMD was generally manageable and successfully integrated into everyday life, SMD disrupted identity, autonomy, and expected life trajectories. Current surgical pathways appear to address these cognitive sequelae insufficiently. Improved expectation management, together with structured preoperative counseling and postoperative rehabilitation, may facilitate adaption to memory decline and improve long-term functioning and quality of life after surgery.
What is already known on this topic
Temporal lobe epilepsy surgery (TLS) is an effective treatment for drug-resistant epilepsy but is frequently associated with postoperative memory decline. Although the cognitive risks of surgery are well established, it remains unclear when memory decline becomes a clinically meaningful complication and how different degrees of decline affect patients’ everyday lives.
What this study adds
While patients have traditionally been counselled primarily about the probability of experiencing memory decline after TLS, our findings shift the focus towards the severity and consequences of such decline. If memory loss occurs, the average magnitude of decline appears to be largely manageable in everyday life, whereas disabling memory impairment should be considered a very rare complication.
How this study might affect research, practice or policy
These findings support integrating individualized expectation management, structured neuropsychological follow-up, and cognitive and psychological pre-/rehabilitation into routine epilepsy surgery care, particularly for patients at high risk of severe memory decline.
