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Zorluk: OrtaPreoperative and Postoperative Care

A 64-year-old woman is evaluated on postoperative day 6 following an elective right total knee arthroplasty. Her past medical history is significant for moderate chronic obstructive pulmonary disease and diet-controlled type 2 diabetes mellitus. Since the surgery, she has been receiving continuous intravenous piperacillin-tazobactam for surgical site prophylaxis due to a suspected intraoperative contamination event that was later deemed low-risk. Over the last 24 hours, she has developed a new temperature of 38.6°C (101.5°F) and reports five episodes of profuse, watery diarrhea associated with mild lower abdominal cramping. Vital signs include a blood pressure of 118/76 mmHg, a heart rate of 98/min, and a respiratory rate of 16/min. Oxygen saturation is 95% on room air. Physical examination reveals mild diffuse abdominal tenderness without rebound or guarding. Chest auscultation reveals distant breath sounds but no crackles or wheezes. The surgical incision is clean, dry, and intact, and both calves are soft and non-tender. Which of the following is the most appropriate next step in management?

  1. Discontinue piperacillin-tazobactam and send a stool sample for Clostridioides difficile testingCevap
  2. B
    Continue piperacillin-tazobactam and administer oral loperamide
  3. C
    Escalate antimicrobial therapy to intravenous meropenem and obtain blood cultures
  4. D
    Order a lower extremity venous duplex ultrasonography
  5. E
    Administer intravenous furosemide and nebulized albuterol

Cevap

Discontinue piperacillin-tazobactam and send a stool sample for Clostridioides difficile testing
The patient's presentation of a new-onset fever, profuse watery diarrhea, and abdominal cramping on postoperative day 6 is highly suspicious for a Clostridioides difficile infection (CDI). This complication is directly linked to her prolonged, inappropriate exposure to prophylactic broad-spectrum antibiotics (piperacillin-tazobactam). The normal colonic flora has been eradicated, allowing C. difficile to proliferate and release toxins. When CDI is suspected, the most critical initial step in management is to immediately discontinue the inciting antimicrobial agent, if clinically feasible, and to send a stool sample for C. difficile toxin assay or nucleic acid amplification testing. Initiating targeted therapy (such as oral vancomycin or fidaxomicin) is the subsequent step once the diagnosis is confirmed, but stopping the offending agent is paramount.

Adım Adım Çözüm

1
Analyze the postoperative timeline and new clinical symptoms.
The patient has developed a new fever on postoperative day 6, accompanied by profuse watery diarrhea and abdominal cramping.
Establishing the timeline and focal symptoms directs the differential diagnosis away from early postoperative complications (like atelectasis) toward later complications like deep vein thrombosis, surgical site infections, or drug-related adverse events.
2
Evaluate the patient's medication history and risk factors.
The patient has been receiving an inappropriately prolonged course of intravenous piperacillin-tazobactam since her surgery.
Prolonged use of broad-spectrum antibiotics is the most significant risk factor for the disruption of normal colonic flora, leading to Clostridioides difficile overgrowth.
3
Determine the optimal immediate intervention.
The most appropriate next step is to stop the offending antimicrobial agent and confirm the diagnosis with a stool toxin assay or nucleic acid amplification test.
In non-fulminant cases of suspected C. difficile infection, halting the inciting antibiotic is the most critical initial management step before initiating targeted therapy like oral vancomycin.

Anahtar Kavram

The identification and initial management of postoperative Clostridioides difficile infection driven by poor antibiotic stewardship.
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Preoperative and Postoperative Care

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