Indications for rapid sequence urography after washout (reinjection) in the diagnosis of renovascular hypertension.

38 hypertensive patients suspected of renovascular hypertension were examined with rapid sequence urography, washout, aortography or selective renal arteriography. When discordant results were found between rapid sequence urography and washout, we used a particularly helpful procedure which we define reinjection or rapid sequence urography after washout: washout is followed by the injection of a second 50-cm3 dose of contrast agent and five more roentgenograms at 1-min intervals. In our series, reinjection allowed correct diagnosis in 66% of the cases with discordant results and confirmed diagnosis in 83% of the cases of renovascular hypertension.