A 38-year-old man from Delhi presents with acute colicky flank pain radiating to the groin. Non-contrast CT confirms a 6 mm left ureteric stone. Regarding the management and natural history of ureteric stones, all of the following statements are correct EXCEPT:

Explanation

## Management of Ureteric Stones: Evidence-Based Approach **Key Point:** While alpha-1 blockers (tamsulosin) have shown benefit in DISTAL ureteric stones, their efficacy in PROXIMAL ureteric stones is NOT significant. The statement overgeneralizes the benefit. ### Stone Size and Spontaneous Passage Rates | Stone Size | Passage Rate | Timeline | |---|---|---| | **<5 mm** | >90% | Within 4 weeks | | **5–10 mm** | 50% | Within 4–6 weeks | | **>10 mm** | <10% | Rarely passes spontaneously | **High-Yield:** The patient's 6 mm stone falls in the intermediate category and has approximately 50% chance of spontaneous passage with conservative management. ### Pain Management in Acute Renal Colic **Clinical Pearl:** NSAIDs (indomethacin 50 mg PR, diclofenac 75 mg IM) are first-line because they: - Reduce ureteric inflammation and edema - Decrease prostaglandin-mediated ureteric contractions - Provide superior analgesia compared to opioids alone - Avoid respiratory depression and constipation Opioids (morphine, pethidine) are reserved for NSAID-refractory pain or contraindications to NSAIDs. ### Alpha-1 Blockers: Location-Dependent Efficacy **Warning:** This is a common NEET PG trap. Tamsulosin efficacy depends on stone LOCATION: ```mermaid flowchart TD A[Ureteric Stone]:::outcome --> B{Location?}:::decision B -->|Distal ureteric| C[Tamsulosin effective]:::action B -->|Proximal/mid-ureteric| D[Tamsulosin NOT effective]:::action C --> E[Increases passage rate by 60-70%]:::outcome D --> F[No significant benefit]:::outcome ``` **Mnemonic:** **DISTAL = DRUGS WORK** — Alpha-blockers reduce distal ureteric smooth muscle tone and increase passage rates in distal stones (lower third). Proximal stones are above the level of maximal alpha-1 receptor density and do not benefit significantly. The patient's stone location is not specified, but the statement claims benefit in proximal stones, which is incorrect. ### Indications for Urgent Intervention **Urgent intervention (ureteric stent, percutaneous nephrostomy, or ureteroscopy) is indicated for:** 1. **Fever + obstruction** (infected obstructed system = urosepsis; medical emergency) 2. **Solitary kidney** with obstruction (prevent renal function loss) 3. **Bilateral ureteric obstruction** (acute renal failure risk) 4. **Uncontrolled pain** despite analgesics 5. **Renal insufficiency** (baseline Cr >2 mg/dL) 6. **Pregnancy** with obstructing stone This statement is correct and represents standard practice in Indian urology guidelines.