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Renal hemodynamics and renoprotection.

Giacomina Loriga1, Gianpaolo Vidili, Piero Ruggenenti

  • 1Internal Medicine Department, University of Sassari, Sassari, Italy. giacominal@tiscali.it

Nephron. Clinical Practice
|November 1, 2008
PubMed
Summary
This summary is machine-generated.

Renin-angiotensin system (RAS) blockade with Benazepril and Valsartan impacts kidney hemodynamics. Increased renin activity correlated with rising intrarenal resistances, suggesting renin as a target for renoprotection.

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Area of Science:

  • Nephrology
  • Cardiovascular Research
  • Pharmacology

Background:

  • Angiotensin II (AII) significantly contributes to kidney damage by elevating intraglomerular pressure and promoting fibrosis.
  • Renin-angiotensin system (RAS) inhibition offers long-term renoprotection by mitigating AII's hemodynamic effects and reducing proteinuria.

Purpose of the Study:

  • To investigate intrarenal hemodynamic alterations during RAS blockade using Benazepril alone and in combination with Valsartan.
  • To explore correlations between hemodynamic indices, RAS components, and the antiproteinuric response in chronic proteinuric patients.

Main Methods:

  • Doppler ultrasonography was employed in 15 chronic proteinuric patients.
  • Hemodynamic indices, including resistive index (RI) and pulsatility index (PI), were monitored.
  • Plasma renin activity was assessed alongside antiproteinuric effects.

Main Results:

  • Benazepril monotherapy reduced proteinuria, RI, and PI, with proteinuria reduction correlating with decreased RI.
  • Combined therapy initially decreased RI and PI, but these indices progressively increased over three months.
  • Increased RI correlated with elevated plasma renin activity, indicating renin's role in restoring intrarenal resistances.

Conclusions:

  • Hemodynamic changes induced by RAS inhibitors partially explain their antiproteinuric effect.
  • Elevated renin levels may contribute to renal vasoconstriction, exacerbating kidney damage.
  • Targeting renin presents a promising strategy for renoprotection in proteinuric kidney disease.