Prospective Association Between Left Ventricular Injury Biomarkers Identified by Cardiac MRI and the Risk of Future Ischemic Stroke and Newly Diagnosed Dementia: Results from the Multi-Ethnic Study of Atherosleroscis (MESA)

The study titled “Left Ventricular Injury Detected by Cardiac MRI and Incident Ischemic Stroke and Dementia Risk: The Multi-Ethnic Study of Atherosclerosis (MESA)” (note: the query appears to have a minor typo in “Atherosleroscis,” which should be “Atherosclerosis”) investigates the long-term implications of subtle heart damage on brain health. It was published in Neurology in May 2025 and draws from the MESA cohort, a large, diverse population-based study focused on cardiovascular disease. Background and Objectives Left ventricular injury (LVI) refers to subtle damage to the heart’s left ventricle, which can be detected with high sensitivity using cardiac magnetic resonance imaging (CMR). While such injuries are often asymptomatic, their potential impact on brain health—specifically the risk of ischemic stroke (caused by blocked blood flow to the brain) and dementia—remains understudied. The researchers aimed to assess whether CMR-detected LVI biomarkers are prospectively linked to these neurological outcomes. Methods • Participants: Data came from MESA, involving multi-ethnic adults aged 45–84 without clinical cardiovascular disease at baseline (2000–2002). • Cohorts Analyzed: • CCA cohort (n=2,584): Focused on LVI detected via late gadolinium enhancement (LGE), indicating replacement fibrosis. • MI cohort (n=4,594): Focused on myocardial infarction-related LVI. • Biomarkers Measured: LVI presence, left ventricular ejection fraction (LVEF), and LV apical peak strain (a measure of heart muscle deformation). • Follow-up: Approximately 9 years, tracking incident ischemic strokes (confirmed via adjudication) and newly diagnosed dementia (based on ICD codes and medication use). • Analysis: Adjusted hazard ratios (HR) were calculated, controlling for demographics, vascular risk factors (e.g., hypertension, diabetes), and other confounders. Key Results • Prevalence of LVI: About 11.7% in the CCA cohort (older, more male participants) and similar in the MI cohort. • Incident Ischemic Stroke: • In the CCA cohort: 6% with LVI vs. 3% without (no significant association after adjustment). • In the MI cohort: 12% with LVI vs. 6% without; LVI was significantly linked to higher risk (adjusted HR 1.82, 95% CI 1.08–3.09). • Newly Diagnosed Dementia: • LV apical peak strain was associated with dementia only in the MI cohort (adjusted HR 1.06 per unit, 95% CI 1.01–1.12). • Higher LVEF (per 10% increase) was protective against dementia in both cohorts (e.g., adjusted HR 0.73 in MI cohort, 95% CI 0.59–0.90). • Overall, participants with LVI showed elevated risks for both stroke and dementia, though associations varied by cohort and biomarker. Discussion and Implications CMR-detected LVI appears to be a valuable predictor of future brain-related events, even in individuals without overt heart disease. This suggests that subclinical heart damage may contribute to vascular pathways leading to stroke and cognitive decline. The findings highlight the heart-brain connection and could inform early screening strategies using CMR for at-risk populations. However, the study notes limitations, such as reliance on administrative codes for dementia diagnosis (potentially underestimating mild cases) and the need for further validation in diverse groups. Additional research is recommended to explore mechanisms and interventions. This work builds on MESA’s longitudinal data and was likely presented at conferences (e.g., possibly AHA or similar, given the “Conference” in the query), but the full publication provides the detailed results. If you have access to the full paper or need specifics on methodology, let me know for deeper analysis.