Renal autoregulatory efficiency during angiotensin-converting enzyme inhibition in dogs on a low sodium diet

László Rosivall, Phil Youngblood, L. Gabriel Navar

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Autoregulatory efficiency of renal blood flow (RBF) and glomerular filtration rate (GFR) was evaluated in 12 anesthetized dogs that had been maintained on low-sodium diet during control conditions and following infusion of an angiotensin-converting enzyme inhibitor (captopril). Converting enzyme inhibition (CEI) decreased systemic blood pressure by 15.5 ± 3.5%, increased RBF by 36.3 ± 6.5%, and increased GFR by 25.9 ± 10.7%. In response to reductions in renal arterial pressure, RBF was efficiently autoregulated and did not change significantly until the 89- to 75-mm Hg range during the control period and the 74- to 54-mm Hg range during CEI. Overall GFR autoregulatory efficiency was generally well maintained during CEI; however, evaluation of the coupled autoregulatory efficiency of RBF and GFR indicated that during angiotensin blockade, there was a greater incidence of a dissociation between RBF and GFR autoregulatory efficiency. Six of the 12 dogs showed reduced GFR autoregulatory efficiency at renal arterial pressures where RBF was still well maintained. Thus, while the data indicate that blockade of the renin-angiotensin system does not abolish the basic capability of the kidney to autoregulate either RBF or GFR efficiently, more subtle influences on the coupling of RBF and GFR autoregulatory efficiency were observed at the lower level of the autoregulatory range.

Original languageEnglish
Pages (from-to)18-28
Number of pages11
JournalKidney and Blood Pressure Research
Volume9
Issue number1-2
DOIs
Publication statusPublished - Jan 1 1986

Keywords

  • Angiotensin-converting enzyme inhibition
  • Autoregulation
  • Glomerular filtration rate
  • Low-sodium diet
  • Renal blood flow

ASJC Scopus subject areas

  • Nephrology
  • Cardiology and Cardiovascular Medicine

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