Hydronephrosis is the swelling or enlargement of one or both kidneys caused by impaired drainage of urine. It usually occurs when urine cannot flow normally from the kidney to the bladder because of a blockage, narrowing or backward flow of urine. Kidney stones, urinary tract obstruction, enlarged prostate, congenital abnormalities, ureteral narrowing, pregnancy and certain cancers can cause hydronephrosis. Mild cases may resolve when the underlying problem improves, while prolonged or severe obstruction can damage kidney tissue and reduce kidney function.
Timely evaluation is important because persistent urinary obstruction can increase pressure within the kidney and, in severe or prolonged cases, cause permanent kidney damage or kidney failure. Treatment focuses on identifying and relieving the underlying obstruction, treating associated infection or other causes, and preserving kidney function. Some mild cases may only require monitoring, while significant obstruction may require urinary drainage or a procedure to correct the cause.
Causes
Risk Factors
Nephrectomy : This is the surgical removal of a kidney and may be considered when long-standing hydronephrosis has caused severe, irreversible loss of kidney function, particularly when the affected kidney contributes little or no useful function and is associated with recurrent infection, persistent pain, stones, or other complications.
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Surgery to correct an obstruction: Procedures may be needed for ureteral narrowing, ureteropelvic junction obstruction or other structural abnormalities.
Percutaneous nephrostomy: A drainage tube is inserted through the skin into the kidney when urine needs to be drained directly, including in selected urgent situations.
Treatment of kidney or ureteral stones: Depending on the stone's size and location, treatment may include observation, selected medicines to help stone passage, shock-wave lithotripsy or endoscopic stone removal.
MediRehab (a chain of Rehab centres, part of MediGence) provides comprehensive tele-rehabilitation services designed to support Hydronephrosis patients in Malaysia. Recovery and follow-up depend on the underlying cause, the treatment received and the effect on kidney function.
These Services include:
Medicines do not directly remove every cause of hydronephrosis, so treatment targets the underlying obstruction or condition. Pain-relieving medicines may be used when appropriate, while antibiotics are prescribed when a urinary tract or kidney infection is present. Depending on the cause, medicines may also be used to manage conditions contributing to urinary obstruction, such as symptoms related to an enlarged prostate. When selecting medication, consider kidney function, the underlying cause, and other health conditions.









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