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Difficulty: MediumGastroenterology and Hepatology

A clinical quality committee is reviewing antimicrobial prescribing practices within the gastroenterology and hepatology department. Match the following patient scenarios with the most appropriate, guideline-concordant initial pharmacological management to promote effective care and antimicrobial stewardship.

  • A stable 45-year-old with CT-confirmed uncomplicated acute diverticulitis and no systemic toxicityObservation, symptom management, and no immediate antibiotics
  • A cirrhotic patient presenting with ascites, fever, and ascitic fluid showing 350350 polymorphonuclear cells/mm3mm^3Intravenous cefotaxime
  • A hospitalized patient developing profuse watery diarrhea and a positive stool toxin assay for Clostridioides difficileOral fidaxomicin
  • A patient with advanced cirrhosis being discharged after successfully recovering from an episode of spontaneous bacterial peritonitisOral trimethoprim-sulfamethoxazole

Answer

Uncomplicated diverticulitis is managed with observation; active spontaneous bacterial peritonitis requires intravenous cefotaxime; initial Clostridioides difficile infection is treated with oral fidaxomicin; and secondary spontaneous bacterial peritonitis prophylaxis uses oral trimethoprim-sulfamethoxazole.
Each management strategy directly aligns with current evidence-based guidelines optimizing patient outcomes while minimizing unnecessary broad-spectrum antimicrobial exposure. Matching the clinical severity and specific pathogen risks to the narrowest effective intervention is the cornerstone of gastrointestinal infectious disease management.

Step-by-Step Solution

1
Analyze the diverticulitis scenario.
Identify that the patient is stable with uncomplicated disease, warranting observation without antibiotics.
Routine antibiotics in uncomplicated cases do not improve outcomes and worsen antimicrobial resistance.
2
Evaluate the ascitic fluid findings in the febrile cirrhotic patient.
Confirm spontaneous bacterial peritonitis due to a PMN count greater than 250/mm3250/mm^3, requiring immediate intravenous third-generation cephalosporins.
Untreated spontaneous bacterial peritonitis has a high mortality rate and requires immediate broad-spectrum empirical coverage.
3
Assess the diarrheal presentation and stool assay.
Identify an active Clostridioides difficile infection requiring targeted oral therapy.
Oral fidaxomicin (or oral vancomycin) is the standard of care for initial episodes.
4
Determine the outpatient needs for a patient who just recovered from spontaneous bacterial peritonitis.
Initiate lifelong secondary prophylactic oral antibiotics.
The recurrence rate of spontaneous bacterial peritonitis is extremely high without ongoing daily prophylaxis.

Key Concept

Antimicrobial stewardship and appropriate targeted therapy for gastrointestinal and hepatologic infections
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Topics

Gastroenterology and Hepatology

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