Intelligence quotient (IQ) as a predictor of epilepsy surgery outcome

• DOI: 10.1016/j.yebeh.2022.108708
• Publication Date: 2022-05-28T09:54:48Z
• Authors: Filipa Novais; Mafalda Andrea; Gabriela Andrade; Susana Loureiro; José Pimentel; Luís Câmara Pestana
• Keywords: Adult; Intelligence Tests; Epilepsy; Predictors; Intelligence; 03 medical and health sciences; Treatment Outcome; 0302 clinical medicine; Epilepsy surgery; Seizures; Humans; Intelligence quotient

About one-third of patients with epilepsy have a refractory form which is associated with important economic and psychosocial burden. Most of these patients also suffer from comorbidities. One of the most frequent is cognitive impairment. Resective surgery or neuromodulation techniques may improve seizure control. Several factors have been proposed as potential predictors of the success of surgery regarding seizure frequency. We aimed to study preoperative cognitive performance as a predictor of the epilepsy surgery outcome.In this ambispective study we studied total intelligence quotients (IQ) measured before surgery with the Wechsler Adult Intelligence Scale (WAIS) as a potential predictor of Engel Class at 1 year after surgery. Then we included IQ in a multivariate model and tested its performance.Preoperative IQ was a significant and independent predictor of the Engel Class at 1 year after surgery (OR 0.94; CI 0.90-0.98; p = 0.007). The multivariate model including the age at epilepsy onset, education level, sex, and the type of surgery (resective versus palliative surgery) showed an area under the ROC curve of 0.85.A low intelligence level may constitute a marker of worse prognosis after epilepsy surgery. However, other predictors should also be considered when evaluating surgical candidates.