title: Intrarenal haemodynamics in uranyl nitrate-induced acute renal failure.
abstract: Intrarenal haemodynamics were investigated in the dog at various intervals after the iv. injection of 10 mg/kg uranyl nitrate (UN). Renal blood flow (RBF), as determined by measuring the renal venous effluent and by radioactive microspheres, decreased by about 23% at 6 hr after UN administration, as compared to normal controls, then rose and reached controls at 24 to 48 hr; subsequently, RBF increased and surpassed controls by about 36% at 96 hr. Thus, the early phase (6 hr) and the late phase (96 hr) of uranyl nitrate-induced acute renal failure (UNARF) were characterized by an increase and by a decrease, respectively, in overall renal vascular resistance. Glomerular filtration rate (GFR) diminished to about 37% of controls at 6 hr, with no change in urinary output (V). In the following hours, however, GFR and V fell quickly and reached practically zero at 12 to 24 hr. Approximate calculations revealed a predominantly preglomerular vasoconstriction in the early phase and post-glomerular vasodilatation in the late phase. Radioactive microspheres showed a nearly proportionate decrease in perfusion of all cortical layers in the early phase (6 hr); in the late phase (96 hr), however, blood flow to the outermost layer remained unaltered, while perfusion of the inner cortical and juxtamedullary layers increased significantly.
mesh_terms: D058186:Acute Kidney Injury / Q000139:chemically induced* / Q000503:physiopathology; D000818:Animals; D004285:Dogs; D005260:Female; D005919:Glomerular Filtration Rate; D006439:Hemodynamics / Q000187:drug effects*; D007668:Kidney / Q000098:blood supply*; D008297:Male; D012039:Regional Blood Flow; D012077:Renal Artery / Q000503:physiopathology; D012082:Renal Veins / Q000503:physiopathology; D014501:Uranium / Q000009:adverse effects*; D014502:Uranyl Nitrate / Q000009:adverse effects*; D014563:Urodynamics; D014655:Vascular Resistance
chemical_list: D014502:Uranyl Nitrate; D014501:Uranium