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Ethnic differences in forearm vasodilator capacity

A L Hinderliter1, A R Sager, A Sherwood

  • 1Department of Medicine, University of North Carolina, Chapel Hill, USA.

The American Journal of Cardiology
|July 15, 1996
PubMed
Summary
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African-Americans exhibit higher minimum forearm vascular resistance and a trend toward greater left ventricular relative wall thickness compared to whites, suggesting early vascular remodeling. This ethnic difference in vascular structure is linked to ventricular geometry variations.

Area of Science:

  • Cardiovascular Physiology
  • Vascular Biology
  • Clinical Medicine

Background:

  • Previous research indicates ethnic variations in left ventricular structure among both normotensive and hypertensive individuals.
  • Ethnic differences in ventricular geometry may be linked to underlying vascular structure variations.

Purpose of the Study:

  • To investigate if ethnic differences in ventricular geometry are associated with differences in forearm vascular structure.
  • To compare minimum forearm vascular resistance and left ventricular geometry between healthy young African-Americans and whites.

Main Methods:

  • Measured minimum forearm vascular resistance using plethysmography after forearm ischemia.
  • Assessed left ventricular mass and relative wall thickness via 2-dimensional-directed M-mode echocardiography.

Related Experiment Videos

  • Utilized ambulatory blood pressure monitoring to determine average daytime blood pressure.

    • Main Results:

    • African-Americans demonstrated significantly higher minimum forearm vascular resistance (2.39 +/- 0.75 mm Hg) compared to whites (2.03 +/- 0.55 mm Hg, p <0.05).
    • A trend towards greater left ventricular relative wall thickness was observed in African-Americans (0.38 +/- 0.07) versus whites (0.35 +/- 0.06, p=0.09).
    • Both groups were similar in age, gender, body mass index, family history of hypertension, and average daytime blood pressure.

    Conclusions:

    • Early vascular remodeling appears present in African-Americans even without established hypertension.
    • Ethnic variations in vascular structure are associated with differences in left ventricular geometry.
    • Findings suggest a link between vascular and ventricular remodeling in young, healthy African-Americans.