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Racial Differences in Mental Stress-Induced Transient Endothelial Dysfunction and Its Association With Cardiovascular

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Summary

Black individuals with coronary heart disease (CHD) experience more transient endothelial dysfunction (TED) after mental stress. This dysfunction significantly contributes to their increased risk of adverse cardiovascular events.

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Area of Science:

  • Cardiovascular Medicine
  • Vascular Biology
  • Health Disparities

Background:

  • Coronary heart disease (CHD) affects diverse populations, with varying impacts on cardiovascular outcomes.
  • Endothelial dysfunction, a precursor to cardiovascular events, may be exacerbated by mental stress.
  • Understanding racial differences in stress-induced endothelial dysfunction is crucial for targeted interventions.

Purpose of the Study:

  • To investigate racial disparities in transient endothelial dysfunction (TED) following mental stress among patients with CHD.
  • To assess the impact of TED on cardiovascular outcomes in Black versus non-Black individuals with CHD.

Main Methods:

  • A cohort of 812 stable CHD patients (Black and non-Black) underwent flow-mediated vasodilation (FMD) assessment before and after mental stress.
  • TED was defined as a post-stress FMD lower than pre-stress FMD.
  • Associations between TED, race, and a composite endpoint of cardiovascular death or myocardial infarction were analyzed.

Main Results:

  • Black participants exhibited lower prestress FMD and higher incidence of TED (76% vs. 67%) compared to non-Black participants.
  • Black patients had a 41.9% higher risk of cardiovascular death or myocardial infarction.
  • TED following mental stress accounted for 69% of the excess cardiovascular risk observed in Black patients.

Conclusions:

  • Black individuals with CHD are more prone to developing mental stress-induced endothelial dysfunction.
  • Transient endothelial dysfunction significantly mediates the elevated risk of adverse cardiovascular events in Black patients.
  • These findings highlight the need for culturally sensitive approaches to managing cardiovascular risk in diverse populations.