Abstract
Background: While traditional risk factors are chronic in nature, it is difficult to predict the risk of stroke with respect to time. Identifying certain acute risk factors, particularly associated with a health service contact, may help to prevent stroke. We performed a systematic review to understand the acute risk factors having health service contact within 90 days before incident strokes. Methods: PubMed, Embase and Scopus were searched for studies within last 10 years (2013- September 2022). Studies selected using PRISMA guidelines underwent quality assessment with Newcastle Ottawa scale. Three reviewers independently reviewed and included case control, case-crossover, self-controlled case series and cohort studies that reported raw data or estimates of association between acute events having healthcare contact within 90 days and stroke. Results: 106 studies across 14 countries were included from 12,628 records. Most studies reported all types of strokes as the outcome, with the most evaluated risk-periods being 30 and 90 days before stroke. Groups of acute risk factors were identified based on the reason for healthcare contact. Surgeries(n=43) and medical conditions(n=37) were the commonest groups identified for contacting health services in the acute period before stroke, followed by medications(n=14) and other reasons(n=12) including vaccinations and pathology tests. Subgroups were identified based on the type of acute risk factor (Figure 1). The most commonly examined acute risk factors included infections, myocardial infarction, cardiac surgeries, use of antipsychotics and influenza vaccines. Detailed meta-analyses summarizing the magnitude of effect under each sub-group will be presented. Conclusion: Potential acute risk factors having healthcare contact within 90 days preceding stroke have been identified. Further research to assess the role of interventions in health services addressing the risk of stroke from these events is warranted.
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