Excretion Urography: II. The Relation between Hypaque Excretion and the Intravenous Urogram

Abstract

Visualization of the collecting system during intravenous pyelography was assessed by eye and the scores obtained were correlated with the plasma concentration and dose of Hypaque 45, the glomerular filtration rate [GFR] and the patient''s state of hydration. Patients with impaired renal function were excluded. The mean scores rose with the dose to at least 0.75 ml/lb. In the patients studied, variations in GFR had no effect on the X-ray scores, but were important in subjects with impaired renal function. The scores were higher in patients with low initial rates of urine flow (dehydrated) than in those with high rates of flow (not dehydrated). Overnight dehydration had little effect. No benefit was shown from administering the contrast medium by drip infusion as compared with venous injection.