Mastering Ascites Management in Cirrhosis: PLAB 2 Guidelines

Ascites is one of the most common and challenging presentations you will encounter in your PLAB 2 OSCE stations. This comprehensive guide will equip you with the essential knowledge and practical skills needed to manage patients with cirrhotic ascites according to current UK guidelines.

Understanding Ascites in Cirrhosis

Ascites represents a major complication of decompensated liver cirrhosis, occurring in approximately 60% of patients within 10 years of diagnosis. In the PLAB 2 context, you must demonstrate both theoretical knowledge and practical clinical skills.

Key Pathophysiology Points

• Portal hypertension (sinusoidal pressure >12 mmHg)

• Hypoalbuminemia reduces oncotic pressure

• Renal sodium retention via RAAS activation

• Reduced effective circulating volume

Initial Assessment and Diagnosis

History Taking - Essential Points

• Onset and progression of abdominal distension

• Associated symptoms: Early satiety, breathlessness, ankle swelling

• Systemic symptoms: Fever, abdominal pain (suggesting SBP)

• Risk factors: Alcohol history, viral hepatitis, NAFLD

• Previous episodes of ascites or variceal bleeding

Physical Examination Findings

• Abdominal distension with flanks that shift when turning

• Fluid thrill (when present)

• Striae and prominent superficial veins

• Signs of chronic liver disease: Spider nevi, palmar erythema, gynaecomastia

• Evidence of portal hypertension: Splenomegaly, hemorrhoids

Diagnostic Investigations

Essential Blood Tests:

• LFTs: AST/ALT ratio >1, low albumin, elevated bilirubin

• FBC: Anemia, thrombocytopenia

• U&E and electrolytes: Hyponatremia, AKI markers

• Coagulation: Prolonged PT/INR

Imaging Requirements:

• Abdominal ultrasound: Confirm ascites, assess liver texture, portal flow

• Doppler studies: Portal vein patency, direction of flow

Paracentesis - The Gold Standard

In PLAB 2, you MUST demonstrate knowledge of diagnostic paracentesis:

Indications:

• New onset ascites

• Worsening ascites in known cirrhosis

• Suspected SBP

• Any deterioration in liver failure

Technique (OSCE Pointers):

• Position patient supine with slight elevation

• Ultrasound guidance preferred (demonstrate this knowledge)

• Lateral abdomen, below umbilicus, avoiding surgical scars

• Full aseptic technique

• Collect 20-30ml for analysis

Essential Fluid Analysis:

• Cell count and differential (PMNs >250/μL = SBP)

• Protein and albumin (SAAG calculation)

• Culture (bedside inoculation preferred)

• Cytology if malignancy suspected

Management Algorithm - PLAB 2 Essential

First-Line Management

Grade 1 Ascites (Mild):

• Sodium restriction: <2g/day (88 mmol/day)

• Fluid restriction: Only if serum Na <125 mmol/L

• Monitor weight: Aim for <0.5kg/week loss

Grade 2-3 Ascites (Moderate to Severe):

Diuretic Regimen:

• Spironolactone: 100mg daily (initiate)

• Furosemide: 40mg daily (add after 3-5 days if needed)

• Ratio: 100:40 (maintain)

• Maximum doses: Spironolactone 400mg, Furosemide 160mg

Monitoring Schedule:

• Weight loss: 0.5-1kg/day initially, then 0.5kg/week

• Electrolytes: Twice weekly during titration

• Renal function: Monitor creatinine and urea

Second-Line Management

Large Volume Paracentesis (LVP):

• Indications: Refractory ascites, respiratory compromise

• Technique: Remove all ascitic fluid safely

• Essential: Albumin replacement (8g per liter removed)

• Post-paracentesis care: Monitor for hypotension, AKI

Refractory Ascites Definition:

• Diuretic-resistant: No response to max tolerated doses

• Diuretic-intolerant: Unable to continue due to complications

Third-Line Options

TIPS (Transjugular Intrahepatic Portosystemic Shunt):

• Reserved for selected patients

• Consider hepatic encephalopathy risk

• Requires careful patient selection

Long-term Albumin Infusions:

• Emerging evidence for regular albumin in refractory ascites

• Consider in specific patient groups

Complications and Their Management

Spontaneous Bacterial Peritonitis (SBP)

Clinical Presentation:

• Fever, abdominal pain, encephalopathy

• May be asymptomatic in 10-30%

• High mortality if untreated

Diagnosis:

• PMN count >250 cells/μL in ascitic fluid

• Culture-positive in 50% of cases

Treatment:

• Third-generation cephalosporin: Ceftriaxone 2g daily

• Duration: 5 days minimum

• Albumin: 1.5g/kg on day 1, 1g/kg on day 3

• Prophylaxis: Consider long-term in selected patients

Hepatorenal Syndrome (HRS)

Diagnostic Criteria:

• Cirrhosis with ascites

• Creatinine >133 μmol/L

• No response to volume expansion

• Absence of shock, nephrotoxins, structural kidney disease

Treatment:

• Terlipressin: 1-2mg IV 6-hourly

• Albumin: 1g/kg on day 1, then 20-40g daily

• Duration: 7-14 days

• Early nephrology consultation essential

Pharmacological Considerations

Diuretic Therapy - Key Points

Spironolactone:

• Aldosterone antagonist

• Risk of hyperkalemia

• Gynecomastia and painful breasts

• Start low, go slow

Furosemide:

• Loop diuretic

• Hypokalemia risk

• Less effective in cirrhosis

• Use in combination only

Drug Interactions in Liver Disease

Avoid:

• NSAIDs: Increase AKI risk

• Aminoglycosides: Nephrotoxic

• ACE inhibitors/ARBs: Hypotension and AKI risk

Caution:

• Benzodiazepines: Encephalopathy risk

• Opioids: Accumulation and encephalopathy

Communication Skills - PLAB 2 Scenarios

Breaking Bad News Scenario

Situation: 45-year-old with newly diagnosed cirrhosis and ascites

Structure:

1. SETUP: Private space, invite family if appropriate

2. PERCEPTION: "What have you been told so far?"

3. INVITATION: "Would you like me to explain your diagnosis?"

4. KNOWLEDGE: Simple language, check understanding

5. EMOTIONS: Address fears and concerns

6. STRATEGY: Treatment plan and follow-up

Key Phrases:

• "I have some concerning results to discuss..."

• "Your liver condition has developed a complication called ascites..."

• "This means your liver is not working as well as it should..."

• "There are effective treatments available..."

Compliance Discussion

Addressing Sodium Restriction:

• "Your recovery depends on reducing salt intake..."

• "Many patients find this challenging initially..."

• "Let's discuss practical ways to do this..."

Prognosis and Follow-up

Prognostic Indicators

• Child-Pugh and MELD scores

• Development of complications (HRS, SBP, variceal bleeding)

• Response to treatment

Follow-up Schedule

• Initial stabilization: Weekly review

• Stable patients: Monthly review

• Diuretic adjustments: 3-5 day intervals

Red Flags for Referral

• Rapidly worsening ascites

• Signs of infection (fever, abdominal pain)

• Renal impairment

• Encephalopathy

• GI bleeding

High-Yield PLAB 2 Tips

1. Always calculate SAAG: >1.1 = Portal hypertension

2. Know albumin replacement: 8g/L for LVP, weight-based for SBP

3. Recognize refractory ascites: After optimal diuretic therapy

4. Remember prophylaxis: Norfloxacin for SBP prevention

5. TIPS considerations: Hepatic encephalopathy risk

Common Pitfalls to Avoid

• Inadequate fluid restriction: Don't restrict fluids unless hyponatremic

• Overtreating with diuretics: Monitor electrolytes and renal function

• Missing SBP: Always consider in any cirrhotic with ascites

• Inadequate albumin replacement: Critical after paracentesis

• Ignoring nutrition: Malnutrition common in cirrhosis

Exam-Focused Summary

Essential Facts to Remember:

• SAAG >1.1 = Portal hypertension-related ascites

• PMN >250 = Diagnostic for SBP

• Albumin 8g per liter removed in LVP

• Spironolactone 100mg : Furosemide 40mg ratio

• Maximum diuretic doses: Spironolactone 400mg, Furosemide 160mg

Key Management Principles:

1. Conservative first: Sodium restriction, diuretics

2. Evidence-based: Albumin replacement protocols

3. Safety-focused: Regular monitoring and complication vigilance

4. Patient-centered: Address compliance and quality of life

Mastering ascites management demonstrates your ability to handle complex medical scenarios with precision and compassion – exactly what the PLAB 2 examiners are looking for. Practice these algorithms until they become second nature, and you'll handle any ascites-related OSCE station with confidence.