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Difficulty: MediumInfectious Diseases

An 82-year-old woman is evaluated in the hospital on the day of her planned discharge. She was admitted 4 days ago for an acute exacerbation of heart failure, which has now resolved with intravenous diuresis. An indwelling urinary catheter was placed on admission to closely monitor her urine output. Today, the nursing staff reports that her urine appears cloudy and has a strong malodorous scent. The patient feels well, has no new complaints, and is eager to return home. Her temperature is 37.1 C (98.8 F), blood pressure is 126/78 mm Hg, and pulse is 76/min. Physical examination reveals clear lungs, normal heart sounds, and no suprapubic or costovertebral angle tenderness. A urinalysis shows 15-20 white blood cells/hpf and positive nitrites. Urine culture from a sample taken from the catheter port grows >100,000 CFU/mL of Escherichia coli. Which of the following is the most appropriate next step in management?

  1. A
    Initiate oral ciprofloxacin therapy
  2. B
    Initiate intravenous ceftriaxone therapy
  3. Remove the indwelling urinary catheter and observeAnswer
  4. D
    Replace the indwelling urinary catheter and repeat the urine culture
  5. E
    Administer continuous bladder irrigation

Answer

Remove the indwelling urinary catheter and observe the patient without initiating antimicrobial therapy.
This patient has asymptomatic bacteriuria (ASB). Patients with indwelling Foley catheters rapidly become colonized with bacteria, which frequently leads to cloudy or malodorous urine and positive nitrites, leukocyte esterase, and pyuria on urinalysis. However, in the absence of localizing symptoms (e.g., suprapubic pain, costovertebral angle tenderness) or systemic signs (e.g., fever, altered mental status, hemodynamic instability), these findings represent colonization rather than active infection. According to current guidelines, ASB should not be screened for or treated with antibiotics in this demographic. Since the patient's heart failure exacerbation has resolved and diuresis is complete, the catheter is no longer indicated. The most appropriate next step is simply to remove the catheter and observe the patient, allowing for her safe discharge.

Step-by-Step Solution

1
Evaluate the clinical presentation for signs of true urinary tract infection.
The patient has cloudy, malodorous urine and a positive culture, but lacks fever, suprapubic pain, costovertebral angle tenderness, and hemodynamic instability.
Cloudy or malodorous urine is common with indwelling catheters and does not independently define a symptomatic infection.
2
Determine the diagnosis based on current guidelines.
The presentation is consistent with asymptomatic bacteriuria (ASB) in a catheterized patient.
ASB is defined as the presence of bacteria in the urine without accompanying signs or symptoms attributable to a urinary tract infection.
3
Select the appropriate management strategy.
Discontinue the unnecessary urinary catheter and withhold antibiotics.
Antibiotic treatment for ASB is generally contraindicated as it does not improve outcomes and increases the risk of antimicrobial resistance. The catheter is no longer needed since diuresis is complete, so removal is the definitive next step.

Key Concept

Asymptomatic bacteriuria in patients with indwelling catheters should not be treated with antibiotics, even in the presence of pyuria, cloudy urine, or malodorous urine. Management involves removing the catheter if it is no longer indicated.
Estimated Time:1m 15s
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Topics

Infectious Diseases

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