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Difficulty: HardInfection Control and Hospital-Acquired Conditions

A 76-year-old man is recovering on the surgical ward on postoperative day 3 following an uncomplicated elective repair of an abdominal aortic aneurysm. He has a history of benign prostatic hyperplasia with chronic urinary retention, which was managed with a long-term indwelling Foley catheter prior to admission. The patient is currently ambulating in the hallways and tolerating a regular diet. He reports no suprapubic pain, flank pain, or dysuria, and his mental status remains at his baseline. Vital signs are temperature 37.1°C (98.8°F), blood pressure 130/80 mmHg, pulse 78/min, and respirations 14/min. A urinalysis and urine culture were obtained earlier that morning as part of a standardized postoperative protocol. The urinalysis reveals 25 WBCs/hpf, positive leukocyte esterase, and negative nitrites. The urine culture is now reported to be growing >105>10^5 CFU/mL of Extended-Spectrum Beta-Lactamase (ESBL)-producing *Escherichia coli*. Based on the principles of infection control and antimicrobial stewardship, which of the following is the most appropriate next step in management?

  1. Discontinue the Foley catheter if no longer clinically indicated and observe without prescribing antibioticsAnswer
  2. B
    Initiate empiric intravenous meropenem and implement Contact Precautions
  3. C
    Exchange the Foley catheter for a new one and send a repeat specimen for culture
  4. D
    Initiate oral ciprofloxacin and maintain current catheter management
  5. E
    Order a computed tomography scan of the abdomen and pelvis to evaluate for occult pyelonephritis

Answer

Discontinue the Foley catheter if no longer clinically indicated and observe without prescribing antibiotics
The correct course of action is to discontinue the catheter and observe without antibiotics because this patient has asymptomatic bacteriuria (ASB). In patients with chronic indwelling urinary catheters, bacterial colonization is ubiquitous, occurring in nearly all patients after 30 days of catheterization. The presence of pyuria (WBCs in urine) and a positive culture with high colony counts are expected findings and cannot distinguish between colonization and a true catheter-associated urinary tract infection (CAUTI). The diagnosis of CAUTI requires the presence of clinical symptoms (e.g., fever, rigors, new-onset altered mental status, or flank pain) without another identifiable source. Treating ASB with antibiotics provides no clinical benefit, does not prevent future UTIs, and directly contributes to antimicrobial resistance and adverse events such as C. difficile infection. The cornerstone of infection control and CAUTI prevention is assessing the necessity of the catheter daily and removing it as soon as it is no longer indicated.

Step-by-Step Solution

1
Evaluate the patient's clinical presentation against the laboratory findings.
The patient is afebrile, hemodynamically stable, and lacks any localizing urinary symptoms or signs of systemic infection, despite a positive urine culture with pyuria.
To differentiate between asymptomatic bacteriuria (ASB) and a catheter-associated urinary tract infection (CAUTI).
2
Determine the indication for antibiotic therapy based on infection control and stewardship guidelines.
Antibiotics are not indicated because treating ASB provides no clinical benefit and increases the risk of antimicrobial resistance.
Antimicrobial stewardship protocols mandate avoiding treatment for colonizing flora in the absence of invasive infection.
3
Identify the primary preventive intervention for catheter-associated complications.
The indwelling Foley catheter should be discontinued if it is no longer medically necessary.
Prompt removal of unneeded catheters is the single most critical bundle component for preventing true hospital-acquired CAUTIs.

Key Concept

Asymptomatic bacteriuria is nearly universal in patients with long-term indwelling catheters and should not be treated with antibiotics. The primary infection control intervention is the prompt removal of the catheter when it is no longer strictly indicated.
Estimated Time:1m 30s
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Topics

Infection Control and Hospital-Acquired Conditions

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