ESWL, or extracorporeal shock wave lithotripsy, is a procedure that uses externally generated shock waves to break a kidney or urinary stone into smaller fragments. These fragments can then pass through the urinary tract.

An ESWL stent usually refers to a temporary ureteral stent, often called a double-J or DJ stent, placed inside the ureter before or after stone treatment.

The stent is not the device that breaks the stone. Instead, it helps maintain urine drainage and may provide a pathway for stone fragments to pass in selected situations.

Not every person undergoing ESWL needs a stent.

At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides individualized kidney evaluation and can assess kidney function and coordinate appropriate specialist care for patients with urinary stones.

Why Is a Stent Sometimes Used With ESWL?

A ureteral stent may be considered when the treating team expects that maintaining urine flow will be beneficial.

Potential reasons include:

• A stone is relatively large

• There is concern about obstruction from stone fragments

• The urinary tract is already narrowed or obstructed

• Kidney drainage needs temporary support

• A previous procedure has caused ureteral swelling

• Multiple stone fragments are expected after treatment

• The patient's anatomy or clinical condition makes drainage particularly important

A ureteral stent is a thin flexible tube that extends from the kidney to the bladder and allows urine to bypass or move through a potentially narrowed area.

Does Everyone Need a Stent Before ESWL?

No.

The decision depends on the stone and the patient's urinary tract.

ESWL itself can often be performed without a stent in appropriately selected patients. The treating urologist considers factors such as:

• Stone size

• Stone location

• Number of stones

• Degree of obstruction

• Kidney anatomy

• Urinary infection

• Previous procedures

• Expected stone-fragment burden

• Kidney function

A stent should therefore not be placed simply because a patient is undergoing ESWL.

What Happens During ESWL?

During shock wave lithotripsy, the stone is located using appropriate imaging and targeted shock waves are directed toward it.

The shock waves fragment the stone into smaller pieces that may subsequently pass through the urinary tract.

Depending on the patient's circumstances, ESWL may be performed with pain control or anesthesia.

The exact procedure varies according to the stone location, equipment, patient factors and treatment plan.

What Does the Stent Do During Stone Treatment?

A ureteral stent can help keep the ureter open and support urine flow from the kidney to the bladder.

After stone fragmentation, it may also provide a route through which smaller fragments can move.

However, a stent does not guarantee complete stone clearance.

Residual fragments may remain after ESWL and can sometimes require observation, additional treatment or another stone-removal procedure.

The need for further treatment depends on follow-up imaging and the patient's symptoms.

Stent Before ESWL vs Stent After ESWL

An ESWL stent may be placed at different stages depending on the clinical situation.

Stent Before ESWL

A stent may be inserted before shock wave treatment when the doctor believes temporary drainage or ureteral support is useful.

This may be considered in selected patients with obstruction or other factors that could complicate stone passage.

Stent After ESWL

A stent may sometimes be left after ESWL when there is concern about fragment passage, ureteral swelling or obstruction.

The decision is individualized rather than automatic.

Can a Stent Prevent Urinary Blockage After ESWL?

A stent can help maintain a pathway for urine drainage, but it does not eliminate every risk of obstruction.

A large amount of fragmented stone material can still create problems.

Patients should therefore report symptoms such as:

• Severe or increasing pain

• Very little urine

• Difficulty passing urine

• Fever or chills

• Persistent vomiting

• Significant worsening of symptoms

Prompt assessment may be needed if obstruction or infection is suspected.

What Is Stent-Related Discomfort?

Ureteral stents can cause temporary urinary symptoms.

Some people experience:

• Frequent urination

• Urgent need to urinate

• Burning while urinating

• Bladder discomfort

• Flank discomfort

• Blood in the urine

• Pain that changes with activity or urination

NIDDK-supported research has found that ureteral stents can cause pain and urinary symptoms, although the severity varies between individuals.

These symptoms do not necessarily mean that the stent is damaged or incorrectly positioned, but significant or worsening symptoms should be discussed with the treating doctor.

How Long Does an ESWL Stent Stay In?

There is no single duration that applies to every patient.

The stent may remain for a relatively short period while:

• Stone fragments pass

• Ureteral swelling settles

• Urine drainage is maintained

• The urinary tract recovers after treatment

The exact removal date depends on the stone, procedure and clinical situation.

Patients should keep track of the planned stent-removal or exchange date.

A ureteral stent should not be left in place indefinitely without medical follow-up. Long-term stents may require periodic replacement.

How Is an ESWL Stent Removed?

When the stent is no longer required, the urologist removes it according to the type of stent and the patient's treatment plan.

Some temporary stents have a retrieval string, while others are removed using a cystoscopic procedure.

The treating urologist will explain which method is appropriate.

Patients should never attempt to remove an internal ureteral stent themselves unless specifically instructed by the treating specialist for a particular stent design.

Is Blood in Urine Normal With an ESWL Stent?

A small amount of blood in the urine can occur after stone treatment or while a ureteral stent is present.

However, heavy bleeding, blood clots, worsening pain, inability to urinate or other significant symptoms require medical assessment.

The significance of hematuria depends on the patient's procedure, medications and overall health.

Can You Work With an ESWL Stent?

Many people can continue some normal activities with a temporary stent, but activity tolerance varies.

Some patients experience urinary urgency, discomfort or flank pain that makes strenuous activity difficult.

Your treating specialist may recommend temporary activity restrictions depending on:

• Stone size

• ESWL findings

• Stent position

• Symptoms

• Other medical conditions

Follow the specific post-procedure instructions provided by your treating team.

Can You Drink Water With an ESWL Stent?

Fluid intake should follow the instructions provided by the treating doctor.

Adequate hydration may be appropriate for many patients after stone treatment, but drinking excessive quantities of water does not guarantee faster stone clearance.

Patients with kidney disease, heart failure, fluid restrictions or other medical conditions may have different fluid requirements.

Do not force large amounts of water if doing so causes pain, vomiting or worsening symptoms.

ESWL Stent and Infection: What Should You Know?

A urinary stent can be associated with urinary symptoms, and infection can occur in patients with urinary stones or instrumentation.

Seek prompt medical attention if you develop:

• Fever

• Chills

• Severe flank pain

• Vomiting

• Feeling significantly unwell

• Reduced urine output

A stone that blocks urine flow together with infection can become a serious medical problem and requires urgent assessment.

Antibiotics should be used only when prescribed or otherwise appropriately recommended by a healthcare professional.

Can ESWL Be Done If There Is an Infection?

An active urinary infection needs appropriate medical assessment before elective stone fragmentation.

If infection is combined with significant obstruction, the priority may be to establish urine drainage rather than immediately performing definitive stone treatment.

Depending on the situation, drainage can involve a ureteral stent or nephrostomy.

The definitive stone procedure can then be planned after the infection has been appropriately managed.

What Happens After ESWL and Stent Placement?

Follow-up depends on the stone and treatment outcome.

The treating team may assess:

• Pain

• Urine output

• Urinary symptoms

• Fever or infection

• Stone-fragment passage

• Kidney function when appropriate

• Residual stone burden

Follow-up imaging may be recommended to determine whether the stone has cleared.

If substantial residual stone remains, another procedure may be considered.

What If the Stone Does Not Break Completely?

ESWL does not guarantee complete fragmentation of every stone.

Treatment success can be influenced by:

• Stone size

• Stone location

• Stone composition

• Stone density

• Kidney anatomy

• Body habitus

• Skin-to-stone distance

• Urinary drainage

If significant stone material remains, options may include another ESWL session, ureteroscopy with laser treatment, RIRS or another procedure depending on the circumstances.

NIDDK notes that larger or obstructing stones may require active stone removal, including ESWL, ureteroscopy or PCNL.

Is a Stent Better Than ESWL Without a Stent?

There is no universal answer.

A stent is useful when there is a clinical reason to support drainage or facilitate fragment passage, but stents can also cause discomfort and urinary symptoms.

Therefore, the decision should be individualized rather than treating stent placement as a routine requirement for every ESWL patient.

The treating urologist will balance expected benefits against stent-related symptoms and procedural considerations.

When Should You Contact a Doctor After ESWL?

Contact your treating team promptly if you develop:

• Increasing or severe pain

• Fever or chills

• Persistent vomiting

• Very little or no urine

• Difficulty urinating

• Heavy blood in urine

• Large blood clots

• Severe weakness

• Rapid worsening of symptoms

These symptoms may indicate obstruction, infection, bleeding or another complication requiring assessment.

Kidney Function Assessment Around Stone Treatment

Patients with significant urinary stones may need kidney-function evaluation, particularly when obstruction or other kidney disease is suspected.

Depending on the situation, testing may include:

• Serum creatinine

• eGFR

• Electrolytes

• Urinalysis

• Urine culture

• Ultrasound

• CT or other appropriate imaging

Kidney function can influence treatment planning and medication choices.

Preventing Another Kidney Stone

Breaking or removing a stone does not necessarily prevent another stone from developing.

After treatment, prevention may involve:

• Maintaining appropriate fluid intake

• Reducing excessive dietary sodium

• Following an individualized dietary plan

• Reviewing stone composition

• Considering metabolic evaluation in recurrent stone formers

• Treating relevant metabolic abnormalities

• Taking prescribed preventive medicines when indicated

The prevention strategy should be based on the type of stone and individual risk factors.

ESWL and Stent Evaluation at Prabhakar Bhurke Clinic

At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides individualized evaluation for patients with kidney stones and associated kidney-function concerns.

Depending on the clinical situation, care may include:

• Review of kidney stone imaging

• Assessment of kidney function

• Evaluation of urinary obstruction

• Review of urine tests and infection risk

• Assessment of fluid and electrolyte status

• Medical management of kidney-related complications

• Follow-up after stone treatment

• Coordination with appropriate urological specialists when ESWL, ureteroscopy, stenting or another stone procedure is required

The need for an ESWL stent depends on the patient's stone characteristics, urinary drainage and overall clinical condition.

Frequently Asked Questions

Is a stent always required for ESWL?

No. Some patients can undergo ESWL without a ureteral stent. Stenting is considered selectively according to stone characteristics, obstruction risk and the patient's anatomy and clinical condition.

Why is a stent placed after ESWL?

A stent may be placed to support urine drainage or help facilitate passage of stone fragments in selected patients.

Is ESWL painful with a stent?

ESWL and stent placement can cause discomfort, but pain control is provided according to the procedure and patient's needs. A stent itself may cause urinary urgency, frequency or flank discomfort.

How long does an ESWL stent remain in the body?

The duration varies. It may be removed after the urinary tract has recovered and stone fragments have passed, according to the treating specialist's plan.

Can a kidney stone pass with a stent?

A stent keeps the ureter open and supports urine drainage. Stone fragments may pass around or alongside it, but the stent does not guarantee complete stone clearance.

Can I remove an ESWL stent myself?

Do not attempt to remove an internal ureteral stent yourself unless your treating specialist has specifically instructed you to do so for the particular type of stent used.

What happens if an ESWL stent is left for too long?

A ureteral stent left beyond its planned duration can develop complications such as encrustation, infection or blockage. Follow the scheduled removal or exchange plan provided by your urologist.

Is fever after ESWL with a stent normal?

Fever should not simply be assumed to be a normal stent symptom. Fever or chills after stone treatment can indicate infection and requires prompt medical assessment.

Conclusion

An ESWL stent is a temporary ureteral tube that may be used in selected kidney stone patients undergoing shock wave lithotripsy. It can help maintain urine drainage and may assist the passage of stone fragments, but not every patient undergoing ESWL requires a stent.

The decision depends on stone size and location, obstruction, urinary anatomy, infection status, expected fragment burden and the patient's overall health.

After ESWL, some patients may experience urinary urgency, frequency, flank discomfort or mild blood in the urine because of the procedure or stent. Severe pain, fever, chills, very little urine, difficulty urinating or rapidly worsening symptoms require prompt medical evaluation.

For individualized assessment of kidney stones, kidney function and post-procedure care, consult Dr. Sandip Prabhakar Bhurke at Prabhakar Bhurke Clinic.

Medical Disclaimer

This article is intended for general educational and informational purposes only and should not replace medical diagnosis, treatment or individualized advice. ESWL and ureteral stent decisions depend on stone size, location, urinary anatomy, obstruction, infection, kidney function and other patient-specific factors. A stent is not required for every ESWL procedure. Do not attempt to insert, remove or adjust a ureteral stent yourself, and do not start antibiotics or change prescribed medicines without professional guidance. Fever, chills, severe or worsening pain, very little or no urine, difficulty urinating, heavy bleeding, blood clots or sudden deterioration after ESWL require prompt medical assessment. Consult Dr. Sandip Prabhakar Bhurke, an appropriate urological specialist, or another qualified healthcare professional for personalized care.