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Anatomic substrate differences between black and white victims of sudden cardiac death: hypertension, coronary artery
1SUNY Health Science Center, Brooklyn 11203.
Insights
Coronary heart disease (CHD) mortality is higher in Black individuals despite similar disease prevalence. Left ventricular hypertrophy (LVH), common in Black individuals due to hypertension, significantly increases cardiac death risk, especially with co-existing coronary disease.
Area of Science:
- Cardiology
- Public Health
- Health Disparities
Background:
- Coronary heart disease (CHD) remains a leading cause of death in the US for both Black and White populations.
- While ischemic syndrome prevalence is similar, Black individuals experience higher cardiac mortality and sudden cardiac death rates.
- Existing explanations for excess Black mortality focus on healthcare access and symptom perception, but anatomical differences are also key.
Purpose of the Study:
- To investigate the differing anatomical substrates of cardiac death between Black and White individuals.
- To examine the role of left ventricular hypertrophy (LVH) as a predictor of cardiac mortality, particularly in the context of coronary artery disease.
- To explore potential reasons for higher cardiac mortality in Black individuals, considering hypertension and LVH prevalence.
Main Methods:
- Comparative analysis of cardiac mortality and anatomical substrates between Black and White populations.
- Review of evidence linking left ventricular hypertrophy (LVH) to cardiac death risk.
- Exploration of the interplay between hypertension, LVH, coronary artery disease, and mortality.
Main Results:
- Obstructive coronary artery disease is generally more severe in White individuals.
- Black individuals exhibit a higher prevalence of hypertensive heart disease and left ventricular hypertrophy (LVH).
- Left ventricular hypertrophy (LVH) is a potent predictor of cardiac death, with risk amplified by co-existing coronary disease.
Conclusions:
- Greater prevalence and severity of hypertension and LVH in Black individuals may explain higher cardiac mortality, even with less severe coronary disease.
- The increased mortality risk associated with LVH might stem from a higher predisposition to malignant arrhythmias and silent ischemic events.
- Further research is needed to fully elucidate the mechanisms underlying increased mortality risk in hypertensive individuals with LVH.
Abstract:
Despite recent declines in mortality from coronary heart disease (CHD), it remains the major cause of death in the United States for blacks and whites. Although the prevalence of the ischemic syndromes in blacks and whites is similar, cardiac mortality and sudden cardiac death rate are higher in blacks. Recent attempts to explain the excess mortality in blacks have focused on barriers to health care and on sociocultural differences in perceptions of and responses to symptoms of CHD. However, the anatomic substrates of ischemia and sudden cardiac death are also different in blacks and whites. Obstructive coronary artery disease tends to be more severe in whites, while blacks have a greater prevalence of hypertensive heart disease. A body of evidence has recently emerged showing that the presence of left ventricular hypertrophy (LVH) is an important, potent predictor for subsequent cardiac death and that the mortality risk of LVH may be particularly high when underlying coronary disease is present. The greater prevalence and severity of hypertension and LVH in blacks may explain the higher cardiac mortality in blacks, even in the presence of less severe coronary disease. The reason why mortality risk is increased in the presence of LVH has not been established. Evidence suggests that it may be due to the increased predisposition to malignant arrhythmias and the increased frequency of potentially lethal silent ischemic events that occur in hypertensive individuals, particularly those with LVH.
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