Obstructing Stone + Signs of Infection
Ureteral stone with fever, pyuria, or sepsis
All Pathways
UrologyEmergency
Obstructing Ureteral Stone with Infection (Infected Hydronephrosis)
Obstructing Ureteral Stone with Infection (Infected Hydronephrosis): Obstructing Stone + Signs of Infection → Confirm Diagnosis → ⚠️ UROLOGICAL EMERGENC...
Pathway Overview
14 steps
Algorithm Steps
14 total
01Start 02Action Confirm Diagnosis
Imaging + labs to confirm infected obstruction
- CT without contrast: Stone location, hydronephrosis
- UA: Pyuria, bacteriuria
- Blood cultures BEFORE antibiotics
- Urine culture if possible
- Labs: CBC, BMP, lactate, procalcitonin
03Warning ⚠️ UROLOGICAL EMERGENCY
Infected obstructed kidney = mortality risk
- Obstructed + infected kidney is life-threatening
- Can rapidly progress to septic shock
- Antibiotics alone will NOT resolve
- MUST decompress urgently
04Action Sepsis Resuscitation
Follow SSC sepsis bundle
- IV fluid resuscitation (30mL/kg crystalloid)
- Lactate measurement
- Blood cultures before antibiotics
- Vasopressors if hypotensive despite fluids
- ICU admission if septic shock
05Decision Patient Hemodynamically Stable?
Determines approach to decompression
06Action Stable: Stent or PCN
Either approach acceptable
- Ureteral stent: Can be done cystoscopically
- PCN: Percutaneous nephrostomy
- No clear superiority of one over other
- Choice based on availability and patient factors
- Stent may be preferred if stone likely passable
07Action Ureteral Stent Placement
Retrograde approach via cystoscopy
- Cystoscopy + retrograde pyelogram
- Guidewire past obstruction
- Place double-J stent
- Confirm position with fluoroscopy
- May not be possible if stone impacted
08Action Post-Decompression Care
Continue treatment, monitor response
- Continue IV antibiotics
- Monitor fever, WBC, clinical status
- Expect improvement within 24-48h
- If no improvement, consider abscess/alternative source
- May need repeat imaging
09Warning ⚠️ Delay Definitive Stone Treatment
Do NOT attempt stone removal during active infection
- Wait until infection cleared
- Complete antibiotic course
- Afebrile for 48-72 hours minimum
- Definitive treatment 2-4 weeks later
- Immediate URS may worsen sepsis
10Outcome Definitive Stone Management
After infection resolved
- Ureteroscopy + laser lithotripsy
- PCNL for large/complex stones
- ESWL for selected cases
- Remove stent/nephrostomy after stone cleared
11Warning ⚠️ Bilateral Obstruction/Solitary Kidney
Highest urgency - anuria/renal failure
- May present with anuria
- Acute kidney injury
- Decompress BOTH sides urgently
- Dialysis may be needed
- Nephrology consultation
12Action Percutaneous Nephrostomy (PCN)
Antegrade drainage via renal puncture
- Ultrasound or fluoroscopic guidance
- Local anesthesia + sedation
- Puncture dilated collecting system
- Place 8-10 Fr nephrostomy tube
- Send urine for culture
- Path rejoins step 08Shared downstream outcome
13Action Unstable: PCN Preferred
Percutaneous nephrostomy faster/safer
- PCN can be done at bedside/IR
- Avoids OR/anesthesia in unstable patient
- Lower risk procedure in septic patient
- Ultrasound-guided placement
- Allows drainage + access for later
- Path rejoins step 12Shared downstream outcome
14Action Empiric IV Antibiotics
Broad-spectrum within 1 hour
- Cover gram-negative organisms primarily
- Options: Pip-tazo, carbapenem, ceftriaxone + aminoglycoside
- Adjust based on local resistance patterns
- Adjust based on culture results
- Continue until afebrile + cultures negative
- Path rejoins step 05Shared downstream outcome
Guideline Source
EAU Guidelines on Urolithiasis 2025 + AUA Surgical Management of Stones 2025
Clinical Safety Information
Clinical Decision Support — Not a Substitute for Clinical Judgment
Individual patient factors may require deviation from these recommendations.
Known Limitations
- Antibiotic selection depends on local resistance patterns
- Choice of stent vs PCN depends on patient factors and availability
- Does not address bilateral obstruction in detail
- Does not address pregnancy-related stones
- Sepsis management details refer to SSC guidelines
Contraindicated Populations
pregnancy_consult_specialist
Applicable Regions
USEUAU
AU: Follow local antibiotic stewardship guidelines
EU: EAU 2025 - infected obstructed kidney is urological emergency
US: AUA 2025 guidelines - decompression before definitive treatment
Version 1Next review: 2028-01-11
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Related Resources
Frequently Asked Questions
What is the Obstructing Ureteral Stone with Infection (Infected Hydronephrosis)?
The Obstructing Ureteral Stone with Infection (Infected Hydronephrosis) is a emergency clinical algorithm for Urology. It provides a structured decision tree to guide clinical decision-making, based on EAU Guidelines on Urolithiasis 2025 + AUA Surgical Management of Stones 2025.
What guideline is the Obstructing Ureteral Stone with Infection (Infected Hydronephrosis) based on?
This algorithm is based on EAU Guidelines on Urolithiasis 2025 + AUA Surgical Management of Stones 2025 (DOI: 10.1016/j.eururo.2024.03.026).
What are the limitations of the Obstructing Ureteral Stone with Infection (Infected Hydronephrosis)?
Known limitations include: Antibiotic selection depends on local resistance patterns; Choice of stent vs PCN depends on patient factors and availability; Does not address bilateral obstruction in detail; Does not address pregnancy-related stones; Sepsis management details refer to SSC guidelines. Individual patient factors may require deviation from these recommendations.
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