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Renal perfusion and function in healthy African Americans.

D A Price1, N D Fisher, S Y Osei

  • 1Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02215, USA. daprice@partners.org

Kidney International
|March 7, 2001
PubMed
Summary

Healthy African Americans exhibit reduced renal plasma flow and altered renin-angiotensin system responses, suggesting intrarenal activation that may increase nephropathy risk. These findings highlight key differences in renal function compared to Caucasians.

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Area of Science:

  • Nephrology
  • Renal Physiology
  • Cardiovascular Research

Background:

  • African Americans have an elevated risk of nephropathy.
  • Limited understanding exists regarding renal perfusion and function in healthy African Americans.

Purpose of the Study:

  • To compare renal perfusion and function between healthy African Americans and Caucasians.
  • To investigate the role of the renin-angiotensin system in renal hemodynamics in these populations.

Main Methods:

  • Compared renal plasma flow (RPF) and glomerular filtration rate (GFR) in 32 healthy African Americans and 82 age-matched healthy Caucasians.
  • Assessed renal hemodynamic responses to angiotensin II (Ang II) and captopril in a subset of 28 subjects (10 African American, 18 Caucasian).
  • Standardized dietary sodium and potassium intake for all participants.

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Main Results:

  • African Americans showed significantly lower RPF (568 mL/min/1.73 m²) compared to Caucasians (620 mL/min/1.73 m²), despite similar GFR.
  • African Americans exhibited a greater vasodilator response to captopril and a blunted vasoconstrictor response to Ang II.
  • Angiotensin-converting enzyme (ACE) inhibition with captopril enhanced Ang II responsiveness in African Americans.

Conclusions:

  • Reduced RPF and altered renal vascular responses to Ang II and captopril suggest activated intrarenal renin system in healthy African Americans.
  • Identical plasma renin activity (PRA) between groups indicates localized intrarenal activation, not systemic.
  • These differences in renal control mechanisms may contribute to the predisposition to nephropathy in African Americans.