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Difficulty: EasyInfection Control and Hospital-Acquired Conditions

A 75-year-old woman is evaluated in the pre-admission clinic prior to a scheduled elective total hip arthroplasty. She has a medical history of osteoarthritis and well-controlled essential hypertension. The patient reports no acute symptoms, specifically denying dysuria, urinary frequency, urinary urgency, or suprapubic pain. She has no fever, chills, or flank pain. Vital signs are within normal limits. A routine preoperative urinalysis reveals positive leukocyte esterase, positive nitrites, and 25 white blood cells per high-power field, with numerous bacteria present. Which of the following is the most appropriate next step in management regarding these laboratory findings?

  1. Proceed with the scheduled surgery without prescribing antibioticsAnswer
  2. B
    Administer a short course of oral ciprofloxacin
  3. C
    Delay the surgical procedure until a urine culture yields negative results
  4. D
    Obtain a straight catheterized urine specimen for confirmatory testing
  5. E
    Initiate intravenous ceftriaxone immediately

Answer

Proceed with the scheduled surgery without prescribing antibiotics
The correct answer is to proceed with the scheduled surgery without prescribing antibiotics. This patient's urinalysis indicates asymptomatic bacteriuria (ASB), defined as the presence of bacteria in the urine without accompanying signs or symptoms of a urinary tract infection. A core tenet of hospital infection control and antimicrobial stewardship is that ASB should not be screened for or treated in the vast majority of patients, including those undergoing non-urologic surgery (such as an orthopedic joint replacement). Treating ASB does not reduce the risk of surgical site infections and inappropriately exposes the patient to adverse medication effects, drives antimicrobial resistance, and increases the risk of hospital-acquired Clostridioides difficile infection. Screening and treatment for ASB are generally reserved only for pregnant women and patients undergoing urologic procedures with expected mucosal bleeding.

Step-by-Step Solution

1
Assess the patient's clinical presentation.
The patient is entirely asymptomatic with no systemic or localized signs of a urinary tract infection.
To determine if the abnormal urinalysis represents a true symptomatic infection versus asymptomatic colonization.
2
Correlate clinical symptoms with laboratory findings.
The patient has pyuria and bacteriuria on urinalysis but no clinical symptoms, establishing a diagnosis of asymptomatic bacteriuria.
To establish the correct diagnosis before initiating any unnecessary or potentially harmful intervention.
3
Apply evidence-based infection control and stewardship guidelines for asymptomatic bacteriuria.
Determine that the patient does not meet the criteria for treatment, as she is not pregnant and is not undergoing a urologic procedure involving mucosal bleeding.
To avoid inappropriate antibiotic administration, thereby preventing antimicrobial resistance and potential hospital-acquired conditions.

Key Concept

Diagnosis and management of asymptomatic bacteriuria to promote antimicrobial stewardship.
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Topics

Infection Control and Hospital-Acquired Conditions

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