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Difficulty: MediumGastroenterology and Hepatology

An inpatient ward physician is paged regarding a 5454-year-old individual with a history of alcohol-related cirrhosis who has developed a new-onset fever. The patient was admitted the previous day for therapeutic drainage of large-volume ascites. Assessment reveals a temperature of 38.4∘C38.4^\circ\text{C} (101.1∘F101.1^\circ\text{F}). The abdomen is visibly distended, demonstrating shifting dullness and diffuse tenderness upon palpation, though no rebound guarding is present. A timely diagnostic paracentesis yields ascitic fluid with an absolute neutrophil count of 520/mm3520/\text{mm}^3. Ascitic fluid and blood cultures are pending. Which of the following is the most appropriate next step in management?

  1. Commence intravenous cefotaximeAnswer
  2. B
    Commence intravenous piperacillin-tazobactam
  3. C
    Commence intravenous vancomycin
  4. D
    Commence intravenous metronidazole
  5. E
    Withhold antimicrobials pending culture results

Answer

The correct answer is to commence intravenous cefotaxime.
The correct answer is to commence intravenous cefotaxime. This patient's presentation of fever, abdominal tenderness, and an ascitic fluid absolute neutrophil count (ANC) greater than 250/mm3250/\text{mm}^3 is diagnostic for spontaneous bacterial peritonitis (SBP). Immediate empiric antibiotic therapy is critical, as delaying treatment significantly increases mortality. The organisms most commonly responsible for SBP are enteric Gram-negative rods, primarily *Escherichia coli* and *Klebsiella pneumoniae*. A third-generation cephalosporin, such as intravenous cefotaxime or ceftriaxone, is the standard of care because it provides excellent, targeted coverage against these typical pathogens while penetrating effectively into the ascitic fluid.

Step-by-Step Solution

1
Interpret the clinical presentation and ascitic fluid analysis.
The patient has new-onset fever, abdominal pain, and an ascitic fluid absolute neutrophil count (ANC) of 520/mm3520/\text{mm}^3.
An ANC ≥250/mm3\geq 250/\text{mm}^3 in a patient with cirrhosis and ascites confirms the diagnosis of spontaneous bacterial peritonitis (SBP).
2
Determine the most appropriate immediate intervention.
Empiric intravenous antibiotics must be initiated immediately without waiting for culture finalization.
Delaying pharmacological therapy for SBP is associated with a significantly increased risk of rapid clinical deterioration and death.
3
Select the optimal empiric antimicrobial agent based on stewardship guidelines.
Intravenous cefotaxime or ceftriaxone is selected.
Third-generation cephalosporins provide excellent targeted coverage against the most common enteric Gram-negative pathogens causing SBP (*Escherichia coli*, *Klebsiella pneumoniae*) while maintaining good ascitic fluid penetration and avoiding unnecessarily broad coverage.

Key Concept

Spontaneous bacterial peritonitis is diagnosed by an ascitic fluid absolute neutrophil count ≥250/mm3\geq 250/\text{mm}^3 and requires immediate empiric treatment with an intravenous third-generation cephalosporin.
Estimated Time:1m 0s
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Topics

Gastroenterology and Hepatology

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