Intravenous pyelographic visualization after complete ureteral obstruction with hypertonic solute loading

Intravenous pyelography was performed after complete unilateral ureteral obstruction in dogs under conditions of mannitol diuresis and 3% NaCl solute loading. Pyelographic visualization with mannitol diuresis was uniformly poor. Satisfactory intravenous pyelograms were obtained in the 3% NaCl solute loaded group during the first 2 weeks, with nephrogram visualization noted up to 45 days postocclusion. The clinical use of pyelography, boosted by hypertonic solute loading during the early period after complete ureteral obstruction, may yield unexpected good quality studies.