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Difficulty: MediumGeneral Internal Medicine

A 72-year-old woman is evaluated on hospital day 3. She was initially admitted for progressively worsening shortness of breath and bilateral lower extremity swelling. Her medical history is significant for chronic obstructive pulmonary disease, type 2 diabetes mellitus, and essential hypertension. On admission, she was afebrile, with a blood pressure of 152/88152/88 mmHg, heart rate of 8888/min, and respiratory rate of 2020/min. Physical examination revealed jugular venous distention, bibasilar crackles, and scattered expiratory wheezing. An indwelling urinary catheter was placed to strictly monitor fluid output, and intravenous furosemide was initiated. Over the last 7272 hours, she has had excellent diuresis resulting in a 4.54.5-kg (9.99.9-lb) weight loss, and her dyspnea has completely resolved. She currently breathes comfortably on room air. A urine culture sent on admission due to a cloudy appearance now grows >100,000>100,000 CFU/mL of *Escherichia coli*. The patient reports no suprapubic pain, flank pain, or dysuria. Her current temperature is 37.0∘37.0^\circ C (98.6∘98.6^\circ F). Which of the following is the most appropriate next step in management?

  1. Remove the indwelling urinary catheter and observeAnswer
  2. B
    Initiate targeted antimicrobial therapy with oral ciprofloxacin
  3. C
    Administer systemic corticosteroids and oral azithromycin
  4. D
    Obtain an arterial blood gas to calculate respiratory compensation
  5. E
    Measure serum thyroid-stimulating hormone and free T4 levels

Answer

The most appropriate next step is to remove the indwelling urinary catheter and observe the patient without administering antimicrobial therapy.
The correct approach is to remove the indwelling urinary catheter and observe. The patient has asymptomatic bacteriuria (ASB), defined as isolation of a specified quantitative count of bacteria in an appropriately collected urine specimen from a patient without signs or symptoms of a urinary tract infection. In patients with indwelling Foley catheters, bacterial colonization is nearly universal within a short period. Current clinical guidelines strongly recommend against screening for or treating ASB, as antimicrobial therapy does not improve outcomes and leads to increased adverse drug effects and antimicrobial resistance. Because the patient has successfully undergone diuresis and is clinically stable, the catheter is no longer indicated for strict output monitoring and should be promptly removed to reduce the risk of a true catheter-associated urinary tract infection (CAUTI).

Step-by-Step Solution

1
Evaluate the patient's initial clinical presentation and response to therapy.
The patient presented with signs of acute decompensated heart failure (JVD, crackles, edema) and responded well to diuresis, rendering the indwelling urinary catheter unnecessary.
Establishing the patient's clinical stability ensures no further intensive fluid monitoring is required.
2
Assess the clinical significance of the positive urine culture.
The patient has >100,000 CFU/mL of E. coli but no fever, dysuria, or flank pain, meeting the criteria for asymptomatic bacteriuria (ASB).
Differentiating between ASB and a true catheter-associated urinary tract infection (CAUTI) determines the need for antimicrobial therapy.
3
Determine the optimal management for asymptomatic bacteriuria in a catheterized patient.
Observation and prompt removal of the unnecessary catheter.
Treating ASB with antibiotics is strongly discouraged as it does not improve outcomes and increases the risk of antimicrobial resistance.

Key Concept

Asymptomatic bacteriuria is common in patients with indwelling urinary catheters and should not be treated with antibiotics; the appropriate management is discontinuing the catheter when it is no longer clinically indicated.
Estimated Time:1m 15s
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General Internal Medicine

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