Management of Malignant Ascites in the ICU

Initial Diagnostic and Therapeutic Approach

• The American Association for the Study of Liver Diseases recommends sending ascitic fluid for neutrophil count, total protein, albumin, and calculate serum-ascites albumin gradient (SAAG) to determine if portal hypertension contributes (SAAG ≥1.1 g/dL indicates portal hypertension) 1, 2
• For large volume paracentesis (>5 liters), administer albumin at 8 g per liter of ascites removed to prevent post-paracentesis circulatory dysfunction 3

Role of Diuretics in Malignant Ascites

• If SAAG ≥1.1 g/dL (indicating portal hypertension component), apply cirrhotic ascites management principles: sodium restriction to 90 mmol/day (2 g/day) and spironolactone 100 mg/day, potentially adding furosemide 40 mg/day 1, 2, 4

Sodium and Fluid Management

• Restrict dietary sodium to 90 mmol/day (2 g/day) only if there is a portal hypertension component (SAAG ≥1.1 g/dL) 1, 4
• Fluid restriction is not necessary unless hyponatremia is present (serum sodium <125 mmol/L) 1, 2

Monitoring and Electrolyte Management

• Monitor serum creatinine closely; if creatinine rises significantly or exceeds 150 μmol/L, stop diuretics and consider volume expansion 5
• Check serum potassium regularly, as spironolactone can cause hyperkalemia 3, 5
• For serum sodium <120 mmol/L, stop diuretics immediately and consider volume expansion with colloid 4, 5

Critical Pitfalls to Avoid

• Avoid overzealous diuresis, which can lead to renal failure, hepatic encephalopathy (if cirrhosis present), and electrolyte disorders 3, 4
• Do not use furosemide as monotherapy if diuretics are indicated; it is less effective than spironolactone in portal hypertension-related ascites 4