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Monday, March 31, 2008

VESCICO-URETERIC REFLUX

Urine normally flows in one direction—down from the kidneys, through tubes called ureters, to the bladder. Vesicoureteric reflux is the abnormal flow of urine from the bladder back into the ureters.

Vesicoureteric reflux is most commonly diagnosed in infancy and childhood after the patient has a urinary tract infection (UTI). About one-third of children with UTI are found to have Vesicoureteric reflux. Vesicoureteric reflux can lead to infection because urine that remains in the child's urinary tract provides a place for bacteria to grow. But sometimes the infection itself is the cause of Vesicoureteric reflux.

There are two types of Vesicoureteric reflux. Primary Vesicoureteric reflux occurs when a child is born with an impaired valve where the ureter joins the bladder. This happens if the ureter did not grow long enough during the child's development in the womb. The valve does not close properly, so urine backs up (refluxes) from the bladder to the ureters, and eventually to the kidneys. This type of Vesicoureteric reflux can get better or disappear as the child gets older. The ureter gets longer as the child grows, and the function of the valve improves.

Secondary Vesicoureteric reflux occurs when there is a blockage anywhere in the urinary system. The blockage may be caused by an infection in the bladder that leads to swelling of the ureter. This also causes a reflux of urine to the kidneys.

Infection is the most common symptom of Vesicoureteric reflux. As the child gets older, other symptoms, such as bedwetting, high blood pressure, protein in the urine, and kidney failure, may appear.

Common tests to show the presence of urinary tract infection include urine tests and cultures.

Because no single test can tell everything about the urinary tract that might be important to know, more than one of the following imaging tests may be needed:

  • Kidney and bladder ultrasound: A test that uses sound waves to examine the kidney and bladder. This test shows shadows of the kidney and bladder that may point out certain abnormalities. The test cannot reveal all important urinary abnormalities or measure how well a kidney works.

  • Voiding cystourethrogram (VCUG): A test that examines the urethra and bladder while the bladder fills and empties. A liquid that can be seen on x rays is placed in the bladder through a catheter. Pictures are taken when the bladder is filled and when the child urinates. This test can reveal abnormalities of the inside of the urethra and bladder. The test can also determine whether the flow of urine is normal when the bladder empties.

  • Intravenous pyelogram: A test that examines the whole urinary tract. A liquid that can be seen on x rays is injected into a vein. The substance travels into the kidneys and bladder, revealing possible obstructions.

  • Nuclear scans: A number of tests using radioactive materials that are usually injected into a vein to show how well the kidneys work, their shape, and whether urine empties from the kidneys normally. Each kind of nuclear scan gives different information about the kidneys and bladder. Nuclear scans expose a child to about the same amount of radiation as a conventional x ray. At times, it can be even less.

The goal for treatment of Vesicoureteric reflux is to prevent any kidney damage from occurring. Infections should be treated at once with antibiotics to prevent the infection from moving into the kidneys. Antibiotic therapy usually corrects reflux caused by infection. Sometimes surgery is needed to correct primary Vesicoureteric reflux.

Urine normally flows in one direction—down from the kidneys, through tubes called ureters, to the bladder. Vesicoureteric reflux is the abnormal flow of urine from the bladder back into the ureters.

Vesicoureteric reflux is most commonly diagnosed in infancy and childhood after the patient has a urinary tract infection (UTI). About one-third of children with UTI are found to have Vesicoureteric reflux. Vesicoureteric reflux can lead to infection because urine that remains in the child's urinary tract provides a place for bacteria to grow. But sometimes the infection itself is the cause of Vesicoureteric reflux.

There are two types of Vesicoureteric reflux. Primary Vesicoureteric reflux occurs when a child is born with an impaired valve where the ureter joins the bladder. This happens if the ureter did not grow long enough during the child's development in the womb. The valve does not close properly, so urine backs up (refluxes) from the bladder to the ureters, and eventually to the kidneys. This type of Vesicoureteric reflux can get better or disappear as the child gets older. The ureter gets longer as the child grows, and the function of the valve improves.

Secondary Vesicoureteric reflux occurs when there is a blockage anywhere in the urinary system. The blockage may be caused by an infection in the bladder that leads to swelling of the ureter. This also causes a reflux of urine to the kidneys.

Infection is the most common symptom of Vesicoureteric reflux. As the child gets older, other symptoms, such as bedwetting, high blood pressure, protein in the urine, and kidney failure, may appear.

Common tests to show the presence of urinary tract infection include urine tests and cultures.

Because no single test can tell everything about the urinary tract that might be important to know, more than one of the following imaging tests may be needed:

  • Kidney and bladder ultrasound: A test that uses sound waves to examine the kidney and bladder. This test shows shadows of the kidney and bladder that may point out certain abnormalities. The test cannot reveal all important urinary abnormalities or measure how well a kidney works.

  • Voiding cystourethrogram (VCUG): A test that examines the urethra and bladder while the bladder fills and empties. A liquid that can be seen on x rays is placed in the bladder through a catheter. Pictures are taken when the bladder is filled and when the child urinates. This test can reveal abnormalities of the inside of the urethra and bladder. The test can also determine whether the flow of urine is normal when the bladder empties.

  • Intravenous pyelogram: A test that examines the whole urinary tract. A liquid that can be seen on x rays is injected into a vein. The substance travels into the kidneys and bladder, revealing possible obstructions.

  • Nuclear scans: A number of tests using radioactive materials that are usually injected into a vein to show how well the kidneys work, their shape, and whether urine empties from the kidneys normally. Each kind of nuclear scan gives different information about the kidneys and bladder. Nuclear scans expose a child to about the same amount of radiation as a conventional x ray. At times, it can be even less.

The goal for treatment of Vesicoureteric reflux is to prevent any kidney damage from occurring. Infections should be treated at once with antibiotics to prevent the infection from moving into the kidneys. Antibiotic therapy usually corrects reflux caused by infection. Sometimes surgery is needed to correct primary Vesicoureteric reflux.

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