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Difficulty: EasyGastroenterology and Hepatology

A 62-year-old woman with a history of cirrhosis secondary to metabolic dysfunction-associated steatohepatitis presents to the hospital complaining of generalized abdominal pain and lethargy for the past two days. Her temperature is 38.1∘C38.1^\circ\text{C} (100.6∘F100.6^\circ\text{F}), blood pressure is 102/60 mm Hg102/60 \text{ mm Hg}, and pulse is 92/min92/\text{min}. Physical examination shows a noticeably distended abdomen that is diffusely tender to palpation, accompanied by a positive fluid wave test. A diagnostic paracentesis is promptly performed. The ascitic fluid analysis demonstrates an absolute neutrophil count of 450/mm3450 / \text{mm}^3. Which of the following is the most appropriate next step in the pharmacologic management of this patient?

  1. A
    Intravenous piperacillin-tazobactam and vancomycin
  2. B
    Oral ciprofloxacin
  3. Intravenous ceftriaxoneAnswer
  4. D
    Intravenous metronidazole
  5. E
    Oral rifaximin

Answer

Intravenous ceftriaxone
This patient's clinical presentation of fever and generalized abdominal pain, combined with an ascitic fluid absolute neutrophil count (ANC) greater than 250/mm3250 / \text{mm}^3, is definitively diagnostic for spontaneous bacterial peritonitis (SBP). The most common causative organisms for this condition are enteric Gram-negative rods (such as Escherichia coli and Klebsiella) and streptococcal species. The first-line targeted empirical treatment for community-acquired SBP is a third-generation cephalosporin, such as intravenous ceftriaxone or cefotaxime, which effectively covers these typical pathogens.

Step-by-Step Solution

1
Interpret the ascitic fluid absolute neutrophil count (ANC).
The ANC is 450/mm3450 / \text{mm}^3, which is greater than the diagnostic threshold of 250/mm3250 / \text{mm}^3.
An elevated ANC in ascitic fluid establishes the diagnosis of spontaneous bacterial peritonitis (SBP).
2
Select the most appropriate initial empiric antibiotic therapy.
Identify that a third-generation cephalosporin is required.
Third-generation cephalosporins effectively cover the most common pathogens responsible for community-acquired SBP, adhering to proper antibiotic stewardship by avoiding unnecessarily broad-spectrum agents.

Key Concept

The diagnosis of spontaneous bacterial peritonitis (SBP) is confirmed with an ascitic fluid absolute neutrophil count (ANC) ≥250/mm3\geq 250 / \text{mm}^3, and the standard first-line treatment is a third-generation cephalosporin such as intravenous ceftriaxone.
Estimated Time:1m 0s
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Topics

Gastroenterology and Hepatology

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