A 48-year-old woman with Child-Pugh Class B cirrhosis due to hepatitis C presents with ascites refractory to dietary sodium restriction and furosemide 80 mg daily. What is the drug of choice for management of refractory ascites?

Explanation

## Refractory Ascites in Cirrhosis **Key Point:** Spironolactone combined with furosemide is the first-line pharmacological treatment for refractory ascites. The combination addresses both sodium retention (aldosterone antagonism) and volume overload (loop diuresis) synergistically. ### Definition of Refractory Ascites Ascites that cannot be mobilized or recurs rapidly despite: - Maximum tolerated diuretic therapy (spironolactone ≥400 mg/day + furosemide ≥160 mg/day) - Strict sodium restriction (<88 mmol/day) - Bed rest ### Pathophysiology in Cirrhosis 1. Portal hypertension → splanchnic vasodilation 2. Activation of RAAS and sympathetic nervous system 3. **Secondary hyperaldosteronism** → renal sodium retention 4. Renal vasoconstriction → oliguria 5. Ascites formation and expansion of extracellular fluid ### Why Combination Therapy? | Agent | Mechanism | Advantage | Limitation | |-------|-----------|-----------|----------| | **Spironolactone** | Aldosterone antagonist (distal tubule) | Addresses primary pathology (hyperaldosteronism); K^+^-sparing | Slow onset (3–5 days); hyperkalemia risk | | **Furosemide** | Loop diuretic | Rapid sodium excretion; synergistic with spironolactone | Hypokalemia; worsens renal function if excessive | | **Combination** | Complementary mechanisms | Balanced K^+^ homeostasis; better efficacy | Requires monitoring | **High-Yield:** The ratio of spironolactone:furosemide is typically 100:40 mg (e.g., 200:80 mg) to maintain serum K^+^ balance. Do NOT use spironolactone monotherapy — it is too slow and inadequate for symptomatic ascites. ### Dosing Protocol 1. Start: Spironolactone 100 mg/day + Furosemide 40 mg/day 2. Increase every 3–7 days (if tolerated) up to 400:160 mg/day 3. Target: Weight loss 0.5–1 kg/day (ascites) or 1–1.5 kg/day (ascites + edema) 4. Monitor: Serum creatinine, K^+^, Na^+^ twice weekly during titration **Clinical Pearl:** In refractory ascites unresponsive to maximal diuretics, the next step is *transjugular intrahepatic portosystemic shunt (TIPS)* or *large-volume paracentesis with albumin infusion*, NOT escalation of diuretics (risk of hepatorenal syndrome). **Mnemonic:** **SPIRONOLACTONE + FUROSEMIDE = Synergistic Potassium-balanced Ascites Relief** — the gold standard combination.