(Alteration of renal hemodynamics The decreased renal perfusion caused by renal vasoconstriction is the principal pathogenesis of ARF Effective filtration pressure. FF& KfV GeRV Oliguria or anuria There are many factors may associated with renal vasoconstriction Renin-Angiotensin System Catecholamine Prostaglandins。etc 2525 GFR Oliguria or anuria (l ) Alteration of renal hemodynamics The decreased renal perfusion caused by renal vasoconstriction is the principal pathogenesis of ARF. Effective filtration pressure, FF & Kf  There are many factors may associated with renal vasoconstriction:. Renin-Angiotensin System Catecholamine Prostaglandins, etc