Outcome assessment for epilepsy surgery: The impact of measuring health‐related quality of life

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<jats:title>Abstract</jats:title><jats:p>Epilepsy surgery is an increasingly common treatment for intractable epilepsy; yet there is no clear consensus among experts on how to report epilepsy surgery outcome. Most published outcome reporting systems focus on seizure frequency and type but differ in how they define clinically distinct outcome categories. We used a reliable and valid measure of self‐reported health‐related quality of life (HRQOL), the Epilepsy Surgery Inventory (ESI)‐55, as an external standard by which to evaluate seven previously published, seizure‐based outcome classification systems. The ESI‐55 was administered to 133 adults who had previously undergone surgery for intractable epilepsy, and results were linked to data on their seizure occurrence before and after surgery (over the year prior to their HRQOL reports). These 133 patients were classified according to each seizure‐based outcome system, and variation in HRQOL across outcome groups was evaluated using analysis of variance. Results reveal noteworthy variation in the extent to which different systems reflect patients' HRQOL at follow‐up. We modified existing systems to derive a seizure‐based surgery outcome system that most closely reflects HRQOL when applied over the latest 1‐year postoperative interval.</jats:p>

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