Racial differences in left ventricular structure in healthy young adults

Area of Science:

• Cardiology
• Cardiovascular Physiology
• Racial Health Disparities

Background:

• Cardiac structure and function can vary across racial groups.
• Understanding these differences is crucial for cardiovascular health assessment.
• Previous research suggests potential disparities in cardiovascular parameters between Black and White individuals.

Purpose of the Study:

• To evaluate racial differences in cardiac structure and function in healthy young adults.
• To compare left ventricular (LV) mass index, relative wall thickness, and hemodynamics between Black and White subjects.
• To investigate if these differences persist in the absence of sustained hypertension.

Main Methods:

• Utilized M-mode echocardiography to estimate LV mass index, relative wall thickness, fractional shortening, cardiac index, and systemic vascular resistance index.
• Employed pulsed Doppler to characterize LV filling.
• Conducted ambulatory blood pressure monitoring over a typical day.

Main Results:

• No significant differences in average daytime or resting blood pressure between Black and White subjects.
• Black subjects showed significantly greater relative wall thickness (p<0.01).
• Black subjects had higher resting systemic vascular resistance index (p<0.05) and lower resting cardiac index (p<0.05) compared to White subjects.

Conclusions:

• Racial differences in left ventricular structure and systemic hemodynamics are present in healthy young adults without hypertension.
• Greater relative wall thickness in Black subjects was observed, but without significant differences in LV systolic function or diastolic filling.
• These findings highlight subtle cardiovascular variations between racial groups that warrant further investigation.