[Postobstructive polyuria in unilateral hydronephrosis. A case with 58 l/day]. / Postobstruktive Polyurie bei unilateraler Harnstauung. Fallbeispiel mit 58 l/Tag.

Increased urinary outputs are common after release of bilateral ureteral or subvesical obstruction. However, polyuria is rare following unilateral obstruction. We report a case of excessive postobstructive diuresis of more than 58,000 ml per day (204 l in 10 days) after release of a left ureteral obstruction in a 56-year-old female, being the highest amounts reported in the literature. Polyuria was derived from the obstructed as well as from the normal contralateral kidney. The involved pathomechanism is complex and not completely understood. Treatment includes careful monitoring of the patient and replacement of fluid and electrolytes. In our case complete recovery of kidney function was observed after several days.

A case of renovascular hypertension with marked polyuria after percutaneous transluminal renal angioplasty.

A 43-year-old female patient with hypertension was diagnosed as having one-kidney renovascular hypertension with dysfunction of the contralateral kidney, and percutaneous transluminal renal angioplasty was carried out. Marked polyuria was observed during the 2- to 72-hour postoperative period. During the 12- to 18-hour period of polyuria, the urine volume was 8.9 liters/6 h, which was 62% of the glomerular filtration, and was accompanied by high fractional excretion of sodium and of potassium and a high urine beta 2-microglobulin level. The mechanism of polyuria in this case is discussed.