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Ischemic Stroke and Cerebral Microbleeds: A Two-Sample Bidirectional Mendelian Randomization Study.

Renjie Liu1, Xin Shi2, Jiahui Feng1

  • 1Department of Neurovascular Surgery, The First Hospital of Jilin University, Changchun, 130021, Jilin, China.

Neurology and Therapy
|June 3, 2023
PubMed
Summary
This summary is machine-generated.

Ischemic stroke (IS) and small-vessel occlusion stroke (SVS) may causally increase the risk of cerebral microbleeds (CMBs). This Mendelian randomization study suggests a potential causal link, warranting further investigation into underlying mechanisms.

Keywords:
Cerebral microbleedsIschemic strokeMendelian randomization study

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Area of Science:

  • Neurology
  • Genetics
  • Epidemiology

Background:

  • Observational studies suggest an association between ischemic stroke (IS) and cerebral microbleeds (CMBs).
  • The causal relationship between IS and CMBs requires further investigation.
  • Mendelian randomization (MR) is a robust method for assessing causality.

Purpose of the Study:

  • To evaluate the potential causal association between ischemic stroke (IS) and cerebral microbleeds (CMBs).
  • To investigate the causal relationship in a bidirectional manner using genetic data.
  • To analyze subtypes of IS, including large-vessel atherosclerosis stroke (LVS), cardio-embolic stroke (CES), and small-vessel occlusion stroke (SVS).

Main Methods:

  • A two-sample bidirectional Mendelian randomization (MR) analysis was performed.
  • Genome-wide association studies (GWAS) summary statistics for IS (GIGASTROKE consortium) and CMBs were utilized.
  • Inverse-variance weighting (IVW), MR-Egger, and weighted median (WM) methods were employed for analysis.

Main Results:

  • Higher risk of IS (OR 1.47, p=0.03) and SVS (OR 1.62, p=0.02) were significantly associated with CMBs.
  • Reverse MR analyses did not find significant evidence for a causal effect of CMBs on IS or its subtypes.
  • A Bonferroni-corrected significance threshold of p<0.0125 was applied.

Conclusions:

  • The study provides evidence suggesting a potential causal link between IS, particularly SVS, and an increased risk of CMBs.
  • Further research is necessary to elucidate the specific mechanisms underlying the association between IS and CMBs.
  • The findings contribute to understanding the complex relationship between cerebrovascular diseases.