A 48-year-old woman with alcohol-induced cirrhosis (Child-Pugh Class C) is admitted with abdominal distension, fever (38.5°C), and abdominal pain. Diagnostic paracentesis shows ascitic fluid protein 1.2 g/dL, WBC 350/μL (85% neutrophils), and culture is pending. Serum creatinine is 1.8 mg/dL (baseline 0.9 mg/dL). What is the most appropriate immediate management?

Explanation

## Management of Spontaneous Bacterial Peritonitis (SBP) with Renal Dysfunction ### Clinical Diagnosis: SBP **Key Point:** The diagnostic criteria for SBP are met: - Ascitic fluid neutrophil count **≥250 cells/μL** (this patient: 297.5 neutrophils/μL = 350 × 0.85) - Clinical signs: fever, abdominal pain, elevated WBC - No secondary peritonitis (no perforation, no imaging evidence of peritoneal source) ### Complication: Hepatorenal Syndrome (HRS) This patient has **Type 1 HRS** (rapid renal failure): - Serum creatinine doubled in <2 weeks (0.9 → 1.8 mg/dL) - Oliguria likely (not stated but implied by acute rise) - Occurs in 25–30% of SBP cases; mortality ~50% without treatment ### Evidence-Based Management | Component | Intervention | Rationale | |---|---|---| | **Antibiotic** | Ceftriaxone 1 g IV daily × 7 days | Third-generation cephalosporin; covers Gram-negative organisms; achieves good ascitic penetration | | **Albumin** | 1.5 g/kg day 1, then 1 g/kg day 3 | Expands effective circulating volume; reduces HRS incidence from 30% → 10%; improves survival | | **Vasopressor** | Consider terlipressin (if available) | Splanchnic vasoconstriction; further improves renal perfusion in HRS | | **Monitoring** | Recheck paracentesis only if clinical deterioration | Not routine; culture guides therapy if resistant organism | | **Diuretics** | Hold (contraindicated in HRS) | Worsen renal perfusion; resume only after renal recovery | **High-Yield:** Albumin infusion in SBP reduces HRS incidence and mortality — this is a **Class 1A recommendation** in AASLD guidelines. ### Why This Is Correct 1. **Immediate antibiotic coverage:** Ceftriaxone covers 90% of SBP pathogens (E. coli, Klebsiella, Streptococcus pneumoniae) 2. **Albumin expansion:** Restores effective circulating volume and prevents/reverses HRS 3. **No diuretics:** Spironolactone and furosemide are contraindicated in HRS (worsen renal failure) 4. **No dialysis:** HRS is functional renal failure; dialysis does not improve outcomes and delays vasopressor/albumin therapy 5. **Routine repeat paracentesis:** Not indicated unless clinical deterioration; initial diagnosis is secure **Clinical Pearl:** SBP + HRS is a medical emergency with ~50% mortality. Albumin + antibiotics + vasopressors (terlipressin if available) form the triple therapy that improves survival. ### Why Other Options Are Incorrect **Option 1 (Repeat paracentesis + culture-guided therapy):** Delays empiric antibiotics. SBP is a clinical diagnosis; empiric therapy must start immediately (do not wait for culture). Repeat paracentesis is only if clinical deterioration or atypical presentation. **Option 2 (Diuretics + transplant referral):** Spironolactone and furosemide worsen HRS by reducing renal perfusion. Transplant referral is appropriate but not the immediate next step; stabilize the patient first with antibiotics and albumin. **Option 3 (Haemodialysis + defer antibiotics):** Dialysis does not treat HRS and delays definitive therapy. Antibiotics must be started immediately; waiting for culture results increases mortality. Dialysis may be needed later if renal failure persists, but it is not the first-line intervention.