Considering temporality in causal relationship between seizure worsening and psychological stress in patients with epilepsy during the COVID-19 pandemic: A systematic review

OBJECTIVE: To investigate whether published studies that identified a causal relationship between psychological stress and seizure worsening in patients with epilepsy during the coronavirus disease 2019 (COVID-19) pandemic considered the temporality of Hill’s criteria. METHOD: A systematic review approach was used to comprehensively search MEDLINE, CENTRAL, EMBASE, and ClinicalTrials.gov databases for relevant studies. Studies that reported an association between psychological stress and seizure worsening in patients with epilepsy during the COVID-19 pandemic were included accordingly. The quality of assessments in each study was evaluated and an assessment for considering temporality in the causal relationship between the two events in each study was carried out. RESULTS: Seventeen studies were included in the analysis. Most (14/17) were cross-sectional studies and only four out of these 17 studies (23.5%) considered temporality in the causality. Further, these four studies did not consider temporality in the study design, they only described it as a limitation. CONCLUSION: We found that many articles reported a causal relationship between psychological stress and seizure worsening without considering temporality. As both researchers and readers, we need to consider temporality when interpreting the causal relationship between increased psychological stress and seizure worsening in patients with epilepsy during the COVID-19 pandemic.