Causal relationship between hypertension and epilepsy: a mendelian randomization study

Abstract Background Recent studies suggest that hypertension may increase the risk of epilepsy onset, revealing intricate interactions between cardiovascular health and neurological disorders, thus emphasizing the significance of conducting further investigations into their connection. This study aimed to investigate the potential causality between hypertension, either in systolic or diastolic blood pressure, and epilepsy, using a Mendelian randomization strategy. Methods A two-sample Mendelian randomization design was used in this study. We extracted data from the UK Biobank, FinnGen, and the International Consortium of Blood Pressure, utilizing blood pressure-related single nucleotide polymorphisms as instrumental variables to evaluate the influence of hypertension on the risk of epilepsy. Inverse variance weighted, weighted median, and MR-Egger approaches were used for analysis. Results There was a potential association between hypertension, primarily in systolic blood pressure, and an elevated epilepsy risk, while the relationship between hypertension in diastolic blood pressure and epilepsy risk remained inconclusive. Sensitivity analyses suggest an absence of substantial heterogeneity and confounding effects, suggesting the reliability of our findings. Conclusions Our study lays the groundwork for further investigations into the mechanisms of this causal relationship, which may potentially involve vascular change, neuroinflammatory pathways, and alterations in cerebral blood flow, which are crucial for understanding the complex hypertension-epilepsy nexus.