A 38-year-old man presents to the emergency department with acute left flank pain radiating to the groin, associated with nausea and vomiting for the past 6 hours. He has a history of recurrent kidney stones. On examination, he is restless, with costovertebral angle (CVA) tenderness on the left side. Vital signs are stable. Non-contrast CT (NCCT) abdomen shows a 6 mm stone in the left ureter at the level of the pelvic brim with mild hydronephrosis. Serum creatinine is 1.0 mg/dL, and urinalysis shows hematuria. What is the most appropriate initial management?

Explanation

## Management of Uncomplicated Ureteric Stones ### Clinical Context This patient has an uncomplicated ureteric stone (6 mm) with normal renal function, no fever, no signs of obstruction with infection, and stable hemodynamics. The stone is small and located in the lower ureter. ### Key Point: **Spontaneous passage rates for stones <6 mm are 90%, and for 6–10 mm are 50%.** Conservative management is the first-line approach for uncomplicated, non-obstructing stones in patients with normal renal function. ### Conservative Management Protocol 1. **Hydration**: IV fluids (0.9% saline) to maintain urine output >200 mL/hr 2. **Analgesia**: NSAIDs (indomethacin 50 mg TDS) or opioids for acute pain 3. **Antiemetics**: Ondansetron or metoclopramide 4. **Alpha-blockers** (optional): Tamsulosin 0.4 mg daily may improve passage rates by 20–30% [cite:AUA Guideline 2016] 5. **Follow-up imaging**: Repeat NCCT at 4 weeks if stone persists ### High-Yield: **Indications for ACTIVE intervention (ESWL/URS/PCNL):** - Stone >10 mm - Recurrent pain despite adequate analgesia - Fever/infection (obstructive uropathy with UTI) - Solitary kidney with obstruction - Renal insufficiency (creatinine >1.5 mg/dL) - Failure to pass stone after 4 weeks - Pregnancy ### Why Conservative Management Here? - Stone size 6 mm (borderline for spontaneous passage) - Normal renal function (Cr 1.0 mg/dL) - No fever or signs of infection - Stable hemodynamics - First presentation of pain (adequate analgesia not yet optimized) ### Clinical Pearl: **Restlessness and inability to lie still is classic for renal colic** and does NOT indicate need for urgent intervention — it reflects the severity of pain, not the severity of the stone. ### Table: Stone Size vs. Management | Stone Size | Spontaneous Passage Rate | First-Line Management | | --- | --- | --- | | <6 mm | 90% | Conservative | | 6–10 mm | 50% | Conservative (trial) → intervention if fails | | >10 mm | <10% | Active intervention (ESWL/URS/PCNL) | ### Mnemonic: STONE PASSAGE FACTORS **PASSAGE**: Proximal location (lower passage rates), Age <60, Stone size <6 mm, Size of ureter, Age female (better passage), Gender (male worse), Ethnicity (varies) ### Why Not ESWL or URS Immediately? - ESWL: Reserved for stones >10 mm or failure of conservative management; not first-line for small stones - URS: Invasive; reserved for failed conservative management or high-risk patients - PCNL: Reserved for large stones (>20 mm) or complex cases; not indicated for 6 mm ureteric stone