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[Normothermic ischemia effects in renal microcirculation].

E Lledó Garcia1, I Berenguer Garcia, G Pedemonte

  • 1Servicio de Urología-Unidad de Preseruación Renal Experimental, Hospital General Universitario Gregorio Marañón. ENLLGA@terra.es

Actas Urologicas Espanolas
|November 25, 2005
PubMed
Summary

Hypothermic isolated renal perfusion effectively minimizes ischemia damage. However, ischemic kidneys show increased vascular resistance and creatinine clearance during perfusion, suggesting dynamic changes in renal vasculature.

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Area of Science:

  • Nephrology
  • Surgical Research
  • Organ Preservation

Background:

  • Warm ischemia can negatively impact kidney function post-transplant.
  • Hypothermic isolated perfusion (HP) is used to preserve kidneys.
  • Understanding the effects of ischemia during HP is crucial.

Purpose of the Study:

  • To evaluate the consequences of warm ischemia on kidney function during hypothermic isolated perfusion (HP).
  • To assess the impact of a 45-minute vascular occlusion (warm ischemia) on renal hemodynamics and function.
  • To compare outcomes between kidneys with and without prior warm ischemia.

Main Methods:

  • Isolated kidney perfusion (HP) was performed on multiple kidneys.
  • One group underwent 45 minutes of warm ischemia (vascular occlusion) prior to perfusion.

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  • Creatinine clearance (CrCl) was measured, and HP hydrodynamics were recorded.
  • Histopathological studies were conducted.

    • Main Results:

    • Kidneys subjected to warm ischemia exhibited higher renal vascular resistance and creatinine clearance during HP.
    • Minimal differences were observed in the pathological studies between groups.
    • These findings suggest an increase in efferent-postglomerular arteriole tone post-ischemia.

    Conclusions:

    • Hypothermic isolated perfusion (HP) is adequate in minimizing the histological damage caused by ischemia.
    • Increased vascular tone in the efferent arteriole may explain the observed changes.
    • Microvascular and biochemical alterations during HP are likely dynamic in nature.