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Alternative Names Return to topObstructive uropathy - unilateral - acute; Ureteral obstruction
Definition Return to top
Acute unilateral is a sudden blockage in one of the tubes (ureters) that drain urine from the kidneys.
Causes Return to top
Unilateral obstructive uropathy is most often caused by a kidney stone, although injury or other conditions could cause the disorder.
When urine flow is blocked, it backs up into the kidney. This leads to kidney swelling, also called hydronephrosis.
You have a greater risk for unilateral obstructive uropathy if you have ureteral stones and tumors, kidney stones, and tumors in nearby body structures such as the uterus and cervix.
Acute unilateral obstructive uropathy occurs in 1 in 1,000 people.
Symptoms Return to top
Exams and Tests Return to top
The health care provider will perform a physical exam. Pressing with the fingers on (palpation of) the belly area may reveal a swollen or tender kidney. Blood pressure may be high.
The following tests may be done:
Kidney swelling or blockage of the ureter may be seen on these tests:
Treatment Return to top
The goal of treatment is to relieve or reduce the blockage.
Antibiotics may be given if there is a urinary tract infection.
Stents or drains placed in the ureter or nearby area may provide short-term relief of symptoms. Surgery to repair the underlying cause of the obstruction will usually cure the problem.
Kidney surgery, including removal of the kidney (nephrectomy) may be needed if kidney function is poor or if there is a bad infection.
Outlook (Prognosis) Return to top
The outcome varies. The disorder may result in permanent damage to the kidney. However, kidney failure usually does not result because the second kidney continues to function.
Possible Complications Return to top
When to Contact a Medical Professional Return to top
Call your health care provider if you develop flank pain or other symptoms of acute unilateral obstructive.
Call your health care provider if symptoms worsen during or after treatment, or if new symptoms develop.
Prevention Return to top
If you are prone to kidney stones, drink plenty of water (6 to 8 glasses per day) to reduce the chance of their formation.
Research suggests that a diet low in sodium and oxalate and high in citrate significantly reduces risk of calcium-based kidney stone formation. Consult with a nutritionist for more information on such diets.
Seek medical attention if kidney stones persist or come back to identify the cause and to prevent new stones from forming.
References Return to top
Peters CA. Perinatal urology. In: Wein AJ, ed. Campbell-Walsh Urology. 9th ed. Philadelphia, Pa: Sauders Elsevier; 2007: chap 109.
Pais VM, Strandhoy JW, Assimos DG. Pathophysiology of urinary tract obstruction. In: Wein AJ, ed. Campbell-Walsh Urology. 9th ed. Philadelphia, Pa: Sauders Elsevier; 2007: chap 37.
Hsu THS, Streem SB, Nakada SY. Management of upper urinary tract obstruction. In: Wein AJ, ed. Campbell-Walsh Urology. 9th ed. Philadelphia, Pa: Sauders Elsevier; 2007: chap 38.
Frokiaer J, Zeidel ML. Urinary tract obstruction. In: Brenner BM, ed. Brenner and Rector's The Kidney. 8th ed. Philadelphia, Pa ; Saunders Elsevier; 2007: chap 35.Update Date: 2/9/2009 Updated by: Linda Vorvick, MD, Family Physician, Seattle Site Coordinator, Lecturer, Pathophysiology, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine; Louis S. Liou, MD, PhD, Assistant Professor of Urology, Department of Surgery, Boston University School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.