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Zorluk: KolayInfectious Diseases

A 68-year-old woman is evaluated in the preoperative clinic prior to an elective right total knee arthroplasty. Her past medical history is notable for osteoarthritis and well-controlled hypertension. The patient reports feeling well and specifically denies any dysuria, urinary frequency, suprapubic pain, or fever. Her vital signs are within normal limits. As part of her preoperative workup, a urinalysis is obtained which demonstrates 15 white blood cells per high-power field and is positive for leukocyte esterase and nitrites. A subsequent urine culture grows >10510^5 colony-forming units/mL of *Escherichia coli*. Susceptibility testing shows the organism is sensitive to nitrofurantoin, trimethoprim-sulfamethoxazole, ciprofloxacin, and ceftriaxone. Which of the following is the most appropriate next step in the management of this patient?

  1. A
    Prescribe a 5-day course of oral nitrofurantoin
  2. B
    Postpone the surgery until a repeat urine culture is sterile
  3. Proceed with the scheduled surgery without specific treatment for the bacteriuriaCevap
  4. D
    Prescribe a 3-day course of oral ciprofloxacin
  5. E
    Administer intravenous ceftriaxone for urinary tract infection prophylaxis prior to surgery

Cevap

Proceed with the scheduled surgery without specific treatment for the bacteriuria
The correct approach is to proceed with the scheduled surgery without specific treatment for the bacteriuria. This patient has asymptomatic bacteriuria (ASB), which is defined as the isolation of a specified quantitative count of bacteria in an appropriately collected urine specimen from a person without signs or symptoms of a urinary tract infection. According to current guidelines, screening for and treating ASB is NOT indicated for patients undergoing non-urologic surgeries, including orthopedic procedures like total knee arthroplasty. Treatment in this scenario does not reduce the risk of surgical site infections or symptomatic urinary tract infections. Instead, unnecessary antibiotic use contributes to antimicrobial resistance, increases the risk of *Clostridioides difficile* infection, and exposes the patient to potential drug toxicities. The only widely accepted indications for screening and treating ASB are pregnancy and prior to urologic procedures where mucosal bleeding is anticipated.

Adım Adım Çözüm

1
Evaluate the patient's symptoms and laboratory findings to establish a clinical diagnosis.
The patient has positive urine culture and urinalysis findings but absolutely no urinary or systemic symptoms.
Differentiating asymptomatic bacteriuria from a true urinary tract infection is based entirely on the presence or absence of clinical symptoms.
2
Determine the indications for treating asymptomatic bacteriuria.
The patient is not pregnant and is undergoing an orthopedic procedure (total knee arthroplasty), not a urologic procedure.
Asymptomatic bacteriuria is only treated in specific populations (pregnant women) or prior to urologic procedures with anticipated mucosal bleeding.
3
Select the appropriate management strategy based on the diagnosis and patient context.
No antibiotic therapy is indicated for the bacteriuria; the surgery can proceed as planned.
Treating asymptomatic bacteriuria in this setting does not improve outcomes and contributes to antibiotic resistance.

Anahtar Kavram

Asymptomatic bacteriuria should not be screened for or treated in the general population, including prior to non-urologic surgeries such as orthopedic joint replacements.
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