Long-Term Follow-up in VUR: Ultrasound, Blood Pressure, Urine, and Discharge from Follow-up

Reflux itself causes no pain or symptoms; its harm comes through scarring (reflux nephropathy) caused by infection reaching the kidney, and through congenital kidney developmental abnormality (dysplasia). Once reflux resolves, the risk of infection drops substantially, but any existing scarring remains; follow-up exists to monitor the long-term effect of this scarring on blood pressure, urine protein, and kidney function.

A yearly kidney-bladder ultrasound shows whether the kidneys are growing appropriately for age, cortical thickness, any new dilation, and residual urine after voiding. A widening difference in growth between the two kidneys is an indirect sign of scarring and is assessed with DMSA.

• Ultrasound: once a year; can be spaced to 1–2 years in a scar-free child whose reflux has resolved.
• Blood pressure: at every visit, based on age-height percentile.
• Urinalysis: once a year; protein/creatinine ratio in a child with scarring.
• Blood creatinine: once a year in scarred or bilateral disease; not routinely needed if there is no scarring.
• Height-weight and febrile infection history: at every visit.

DMSA (renal scan) is not a test performed every year. There are three typical reasons to repeat it: checking for a new scar about 4–6 months after a febrile urinary tract infection; a decline in kidney growth on ultrasound or a widening difference between the two kidneys; and wanting to know the kidneys' split function before a treatment decision (surgery or injection).

Adolescence is a natural point at which follow-up is reviewed. Growth is nearing completion, and tunnel lengthening has finished; low-grade reflux that is still present will no longer resolve spontaneously, but if there is no infection it is mostly harmless and does not require routine intervention. During this period, the kidney's condition is documented once more with ultrasound, blood pressure, urine, and, if there is scarring, DMSA.

Not every child needs lifelong follow-up. Our approach, and that of guidelines, is that pediatric urology follow-up can be ended once all of the following conditions are met; after that, a yearly blood pressure check by a family physician and the habit of obtaining a culture with any febrile infection are enough.

• Reflux has resolved spontaneously or with treatment (or is low-grade and infection-free for years).
• No scarring on DMSA, or only a small, unilateral scar that does not affect split function.
• Both kidneys are growing appropriately for age and symmetrically on ultrasound.
• Blood pressure is normal, no protein in the urine.
• No febrile urinary tract infection in the last 1–2 years; BBD, if present, has resolved.
• The family, and the child if old enough, know under what circumstances to come back: febrile UTI, high blood pressure, or a pregnancy plan.

Young women with a history of reflux or scarring have an increased risk of urinary tract infection, pyelonephritis, and high blood pressure (preeclampsia) during pregnancy. This risk is related less to the reflux itself than to the extent of scarring and kidney function; in a woman with no scarring and normal kidney function, the risk is close to that of the general population. Routine correction of persistent low-grade reflux before pregnancy is not supported by evidence; the decision is individual.