About Ureteral Obstruction (Blocked Ureter)
Ureteral obstruction can be caused by various factors and is associated with various risk factors.
Causes of ureteral obstruction may include:
- Scar tissue in the ureters
- Ureteral stones
- Enlarged prostate in males
- Endometriosis in females
- Cysts or tumors in the abdomen that press against the ureters
- Swollen ureters (also called ureterocele)
- Duplicated ureter, which is a birth condition where there is a second ureter on a kidney
Risk factors for ureteral obstruction include:
- Having kidney stones or bladder stones
- Having blood clots
- Having enlarged lymph nodes
It's important to note that having risk factors does not always lead to ureteral obstruction, and some people with ureteral obstruction have no known risk factors.
The common early symptoms of ureteral obstruction include:
- Dull pain
- Fatigue and lethargy
- Difficulty urinating
- More frequent urination
- Nausea and vomiting
- Bloody or cloudy urine
As ureteral obstruction progresses or reaches higher severity, the following symptoms may occur:
- Fever
- Renal colic: This is a sudden increase in pressure or stretch of the ureter, which can cause severe pain in the back or side. It may be accompanied by nausea and vomiting.
- Worsening kidney function: Urinary stasis resulting from ureteral obstruction can lead to worsening kidney function.
It's important to note that symptoms can vary depending on the underlying cause of ureteral obstruction. Additionally, early diagnosis is crucial for timely intervention and management.
To diagnose ureteral obstruction, several examinations, tests, and procedures may be performed. These include:
- Blood and urine tests to look for signs of infection and to check kidney health
- Ultrasound (US): Ultrasound is the main imaging study used to diagnose Ureteral Obstruction. It provides essential information about the urinary tract, such as laterality, kidney size, appearance, and degree of obstruction. However, it does not provide functional information about the urinary tract.
- Computed tomography (CT): CT is considered the definitive diagnostic method if there is still diagnostic uncertainty after ultrasound and MRU have been performed. CT can provide detailed images of the urinary tract and help identify the cause and severity of Ureteral Obstruction.
Additional tests may be done to determine the stage or severity of ureteral obstruction. These include:
- Diuretic ultrasonography: This is a type of ultrasound that is performed after administering a diuretic medication to the patient. It helps evaluate the response of the kidneys to increased urine production and can provide information about the severity of obstruction.
- Radioisotope renography: This test uses a small amount of radioactive material to evaluate kidney function and assess any blockage in the urinary tract. It can help determine the severity of ureteral obstruction.
- Excretory urography: Also known as intravenous pyelogram (IVP), this procedure involves injecting a contrast dye into a vein and taking X-ray images as the dye travels through the urinary system. It can help visualize any blockage or abnormalities in the ureters.
It's important to note that these examinations, tests, and procedures should be performed by healthcare professionals who specialize in diagnosing and treating ureteral obstruction. The choice of which tests to perform may vary depending on individual cases and clinical judgment.
The goals of treatment for ureteral obstruction are to relieve the obstruction in the ureter and protect the function of the kidneys. Here are some treatments options and how they work to achieve these goals:
- Therapeutic procedures:
- Stent placement: A stent (tube) is inserted into the ureter to keep it open
- Nephrostomy tube: A tube is inserted into the kidney from outside the body to help drain urine that cannot drain due to the blocked ureter
- Catheter: A tube is inserted through the urethra and into the ureter to allow the bladder to empty
- Surgical procedures may be necessary and include:
- Endoscopic surgery: An endoscope is inserted through the urethra and enables the surgeon to see blocked or damaged area of the ureter. The surgeon can insert instruments to widen the ureter
- Laparoscopic surgery: Small incisions are made through the skin to insert a camera and instruments to unblock the ureter.
- Medication:
- Alpha blockers: For ureteral obstruction caused by an enlarged prostate, medications may be recommended to relax the prostate or cause it to shrink
- Health behavior changes:
- Making certain lifestyle modifications can also contribute to the treatment of ureteral obstruction.
- Drinking plenty of water can help flush out the urinary system and prevent the formation of kidney stones, which can cause obstructions.
- Avoiding excessive consumption of foods high in salt or oxalate (such as spinach, rhubarb, and chocolate) can also help prevent kidney stone formation.
Ureteral obstruction is a condition where there is a blockage in the ureter, which is the tube that carries urine from the kidney to the bladder. Over time, if left untreated, ureteral obstruction can lead to various complications.
The obstructed kidney experiences reduced blood flow and filtration rate, leading to hydronephrosis (accumulation of urine in the kidney), inflammation, and cell death. As time goes on, there is a loss of renal tissue and the development of severe fibrosis (scarring) in the kidney. This process is associated with molecular events such as apoptosis (cell death), oxidative stress, and inflammation, which contribute to progressive fibrosis.
Common complications of ureteral obstruction:
- Acute symptoms: In some cases, acute symptoms may occur such as fever due to urinary infection or renal colic with nausea and vomiting. These symptoms are caused by increased pressure or stretch on the ureter due to urinary blockage.
- Urinary complications: These can include urinary fistula (abnormal connection between organs), obstruction/stenosis (narrowing of the ureter), and urinary leak.
It's important to note that individual cases may vary. If you have concerns about ureteral obstruction or its complications, it's best to consult with a healthcare professional who can provide personalized advice based on your specific situation.