A 72-year-old man from Mumbai with a 3-year history of BPH managed on tamsulosin presents with acute inability to void. He has not urinated for 12 hours despite a strong urge. Abdominal examination reveals a tender, distended suprapubic mass. Catheterization yields 650 mL of clear urine. Post-void residual is not assessed as the patient is in acute retention. Serum creatinine is 1.8 mg/dL (baseline 1.0 mg/dL). Which of the following is the most appropriate next step in management?

Explanation

## Clinical Scenario: Acute Urinary Retention in BPH This patient has acute retention (inability to void for >12 hours with residual >600 mL) complicated by: - **Elevated creatinine** (1.8 from baseline 1.0) → possible obstructive uropathy, - **Suprapubic tenderness** → bladder overdistension, - **Large residual volume** → severe obstruction. ## Management Algorithm for Acute Retention ```mermaid flowchart TD A[Acute urinary retention]:::outcome --> B[Immediate catheterization]:::action B --> C[Assess renal function & imaging]:::action C --> D{Renal function impaired?}:::decision D -->|Yes| E[Prolonged catheterization 2-4 weeks]:::action D -->|No| F[Trial of void after 3-5 days]:::action E --> G[Reassess renal function]:::action G --> H{Improved?}:::decision H -->|Yes| F H -->|No| I[Definitive surgery TURP/open]:::action F --> J{Successful void?}:::decision J -->|Yes| K[Medical management + follow-up]:::action J -->|No| I ``` ## Why This Approach? **Key Point:** Acute retention with elevated creatinine indicates obstructive uropathy with possible upper urinary tract compromise. The immediate priority is: 1. **Relieve obstruction** (catheter already placed), 2. **Assess renal function** (already elevated), 3. **Allow renal recovery** before attempting trial of void. **High-Yield:** Attempting immediate removal or trial of void in a patient with rising creatinine is premature and risks recurrent retention and further renal deterioration. **Clinical Pearl:** The creatinine rise from 1.0 to 1.8 mg/dL suggests obstructive uropathy. Prolonged catheterization (2–4 weeks) allows: - Bladder decompression, - Renal function recovery, - Assessment of detrusor function before trial of void. ## Next Steps 1. **Renal function tests** (serum creatinine, BUN) — baseline for monitoring recovery, 2. **Imaging** (renal ultrasound or CT) — rule out hydronephrosis, assess upper tracts, 3. **Prolonged catheterization** (2–4 weeks) if renal function is impaired, 4. **Trial of void** after renal function stabilizes/improves, 5. **Definitive surgery** (TURP) if trial of void fails or if recurrent retention occurs. **Warning:** Removing the catheter immediately risks recurrent retention and further renal damage. Proceeding directly to TURP without assessing renal recovery is premature.