A quantitative assessment of renal blood flow autoregulation in experimental diabetes

A. G. De Micheli, H. Forster, R. C. Duncan, M. Epstein

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Several approaches have been utilized to describe renal blood flow (RBF) autoregulation in normal and pathological conditions. When describing the relation between RBF and stepwise decrements in renal perfusion pressure (RPP), these methods have several limitations, including: the necessity for predetermining a pressure 'break-point', and establishing constraints on changes in flow. To circumvent these limitations, we successfully utilized a third order polynomial, the cubical parabola, to characterize the autoregulatory responses in untreated streptozotocin (STZ) diabetic and control rats. The nonlinear relationship occurring between RBF and RPP was estimated from individual observations using the equation RBF=a + b x 10-6 (RPP-c)3. Variables a and c represent RBF and RPP at the inflection point of the curve, respectively; variable b represents the rate of fall of RBF as RPP decreases (shape factor). Variable c was significantly lower in the diabetic group than in the control group whereas variable b was greater in the diabetic group. RBF (a) did not differ between the two groups. In conclusion, we determined that the range of RBF autoregulation in untreated diabetic rats is reset to a lower RPP. Furthermore, the curve below the inflection point declines more rapidly in diabetic rats than in controls. We propose that the equation described herein constitutes a promising and reproducible method for describing RBF autoregulation in vivo.

Original languageEnglish (US)
Pages (from-to)245-251
Number of pages7
JournalNephron
Volume68
Issue number2
StatePublished - Jan 1 1994

Keywords

  • Experimental diabetes
  • Renal blood flow autoregulation
  • Renal hemodynamics

ASJC Scopus subject areas

  • Nephrology

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    De Micheli, A. G., Forster, H., Duncan, R. C., & Epstein, M. (1994). A quantitative assessment of renal blood flow autoregulation in experimental diabetes. Nephron, 68(2), 245-251.