Cognitive behavioral therapy in adults with functional seizures: A systematic review and meta-analysis of randomized controlled trials

Background: Randomized controlled clinical trials (RCTs) investigating cognitive-behavioral therapy (CBT) among adults with functional seizures (FS) have become increasingly available, prompting the opportunity to critically appraise the efficacy and safety of CBT in this population. Methods: We conducted a systematic review and meta-analysis including RCTs comparing CBT in addition to standardized medical treatment (SMT) versus SMT alone for adults with FS. The primary outcome was seizure freedom at the end of treatment. Secondary outcomes included measures of quality of life, anxiety and depression assessed via standardized clinical questionnaires. Results: Three RCTs were included comprising 228 participants treated with CBT and 222 with SMT. The intervention was significantly associated with seizure freedom (Odds Ratio [OR] 1.98; 95 % confidence interval [CI] 1.14, 3.46; p = 0.02; I2 = 0 %), reductions in anxiety (standardized mean difference [SMD] −0.21; 95 % CI −0.41, −0.003; p = 0.047; I2 = 0 %) and improvements in quality of life (SMD 0.34; 95 % CI 0.12, 0.57; p = 0.003; I2 = 0 %) at the end of treatment. Conversely, no significant differences between groups were observed in depression symptoms (SMD −0.19; 95 % CI −0.39, 0.02; p = 0.08; I2 = 0 %). There was no statistically significant increase in the risk of suicidal ideation and self-harm with CBT (OR 2.11; 95 % CI 0.81, 5.48; p = 0.13; I2 = 0 %) nor were there differences in terms of discontinuation rates during follow-up (OR 0.92; 95 % CI 0.49, 1.72; p = 0.79; I2 = 7 %). Conclusions: There is high-quality evidence supporting the efficacy and safety of CBT in treating FS. Future research should investigate whether combining CBT with other therapeutic methods could potentially enhance treatment efficacy.