Match each clinical presentation of a gastrointestinal or hepatic condition with the most … — USMLE Step 2 CK

Match each clinical presentation of a gastrointestinal or hepatic condition with the most appropriate next step in antimicrobial management, demonstrating evidence-based principles of antibiotic stewardship.

A $65$ -year-old man with Child-Pugh class C cirrhosis is admitted to the intensive care unit with an acute esophageal variceal hemorrhage. He is hemodynamically stabilized following urgent endoscopic band ligation. He does not have ascites, and initial blood cultures show no growth at $24$ hours.Complete a $7$ -day course of intravenous ceftriaxone or an oral fluoroquinolone.
A $50$ -year-old man with a $6$ cm amebic liver abscess, confirmed by positive Entamoeba histolytica serology, completes a $10$ -day course of oral metronidazole. His fever and right upper quadrant pain have completely resolved, but a follow-up ultrasound reveals the abscess cavity is unchanged in size.Initiate a course of oral paromomycin or intraluminal diloxanide furoate.
A $72$ -year-old woman with acute cholangitis secondary to choledocholithiasis undergoes emergent endoscopic retrograde cholangiopancreatography (ERCP) with successful stone extraction and biliary sphincterotomy. She received intravenous piperacillin-tazobactam prior to the procedure. She is now afebrile, and her bilirubin levels are rapidly trending downward.Discontinue intravenous antibiotics within $24$ to $72$ hours following the successful intervention.
A $45$ -year-old man with severe acute gallstone pancreatitis develops $>30\%$ pancreatic glandular necrosis on a contrast-enhanced computed tomography scan obtained on hospital day $5$ . He remains hemodynamically stable and afebrile, with a leukocyte count of $12,000/\mu L$ .Provide supportive care without initiating empirical antimicrobial therapy.

Cevap

The correct pairings align each clinical scenario with precise antimicrobial stewardship guidelines: variceal bleeding requires mandatory

7

-day prophylaxis; resolved amebic abscesses require luminal cyst eradication; post-ERCP cholangitis requires rapid antibiotic cessation; and sterile pancreatic necrosis requires the withholding of empirical antibiotics.

Each clinical scenario tests a high-yield principle of antimicrobial stewardship within gastroenterology. Variceal bleeding universally requires short-term prophylaxis. Amebic abscesses require a luminal agent for cyst eradication, not prolonged tissue antibiotics. Post-ERCP cholangitis requires prompt antibiotic cessation after source control. Sterile pancreatic necrosis strictly requires avoiding prophylactic antibiotics.

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Analyze the variceal bleeding scenario (Cirrhosis without ascites).

Matches with completing a

7

-day course of intravenous ceftriaxone or an oral fluoroquinolone.

Gastrointestinal bleeding in cirrhosis causes bacterial translocation. Short-term prophylactic antibiotics are universally indicated to prevent infections and improve survival, even if ascites is absent and cultures are currently negative.

Analyze the amebic liver abscess scenario (Clinically resolved, radiographically unchanged).

Matches with initiating a course of oral paromomycin or intraluminal diloxanide furoate.

Metronidazole treats the invasive tissue infection, but it poorly penetrates the bowel lumen where Entamoeba cysts reside. Paromomycin is required to eradicate the carrier state. The static abscess size is expected and does not justify further tissue-directed antibiotics.

Analyze the acute cholangitis scenario (Successful ERCP source control).

Matches with discontinuing intravenous antibiotics within

24

72

hours.

The primary treatment for cholangitis is biliary decompression. Once the obstruction is cleared and the patient demonstrates clinical improvement, continuing broad-spectrum antibiotics (like piperacillin-tazobactam) for a traditional

7

- to

14

-day course is inappropriate and violates stewardship principles.

Analyze the severe acute pancreatitis scenario (Sterile necrosis).

Matches with providing supportive care without initiating empirical antimicrobial therapy.

The patient is afebrile and stable, indicating sterile necrosis. Routine antibiotic prophylaxis (e.g., with carbapenems) to prevent infection of the necrotic tissue is strongly recommended against by current guidelines.

Anahtar Kavram

Evidence-based antimicrobial stewardship in gastroenterology and hepatology emphasizes source control over prolonged antibiotic durations, targeted eradication of specific pathogen life cycles, and the avoidance of empirical prophylaxis in sterile inflammatory conditions.

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