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Zorluk: OrtaInfectious Diseases

A 74-year-old woman is evaluated on postoperative day 3 following a left total knee arthroplasty. Her temperature is 38.1°C (100.6°F), blood pressure is 128/76 mm Hg, pulse is 82/min, and respirations are 14/min. The patient is ambulating with physical therapy and reports that her surgical pain is well controlled. An indwelling urinary catheter, placed during the surgery, was removed yesterday. She denies dysuria, urinary urgency, frequency, and flank pain. Physical examination shows a clean surgical incision without erythema, induration, or purulent drainage. The lungs are clear to auscultation. The calves are soft, non-tender, and symmetric. A urinalysis reveals 25 white blood cells/hpf and is positive for leukocyte esterase and nitrites. Which of the following is the most appropriate next step in management?

  1. Reassurance and observationCevap
  2. B
    Initiation of oral nitrofurantoin
  3. C
    Initiation of oral ciprofloxacin
  4. D
    Urine culture and initiation of intravenous ceftriaxone
  5. E
    Lower extremity venous duplex ultrasonography

Cevap

Reassurance and observation is the correct management for this patient with asymptomatic bacteriuria and a normal postoperative fever.
The correct answer recommends reassurance and observation. The patient has asymptomatic bacteriuria (ASB), characterized by the presence of bacteria in the urine (suggested by positive nitrites) and pyuria (leukocyte esterase and white blood cells) without localizing signs or symptoms of a urinary tract infection, such as dysuria, frequency, urgency, or flank pain. Furthermore, her mild temperature elevation is a normal physiologic inflammatory response typical in the early postoperative period, often lasting up to 3 to 5 days. ASB is an expected finding following the removal of an indwelling urinary catheter. According to current infectious disease guidelines, ASB should not be screened for or treated with antibiotics except in specific populations, such as pregnant patients and those undergoing endoscopic urologic procedures associated with mucosal trauma. Providing antibiotic treatment for ASB in patients undergoing non-urologic surgery, including orthopedic joint replacement, does not reduce the rate of surgical site infection. Instead, it unnecessarily exposes the patient to adverse drug events, increases the risk of Clostridioides difficile infection, and drives antimicrobial resistance. Therefore, the most appropriate next step in management is observation.

Adım Adım Çözüm

1
Evaluate the patient's clinical presentation and timeline.
The patient has a low-grade fever on postoperative day 3, without localized infectious symptoms or signs of deep vein thrombosis.
Mild fever in the early postoperative period (days 1-3) is frequently a normal physiologic inflammatory response rather than an infectious complication.
2
Interpret the urinalysis findings in the context of the patient's symptoms.
The patient has pyuria and bacteriuria but completely lacks urinary symptoms (no dysuria, urgency, or frequency).
The presence of bacteria and white blood cells in the urine without accompanying genitourinary symptoms confirms the diagnosis of asymptomatic bacteriuria, which is highly expected following recent catheter removal.
3
Determine the appropriate management for asymptomatic bacteriuria in this setting.
Antibiotic therapy is appropriately withheld, and the patient is observed.
Screening for or treating asymptomatic bacteriuria is not indicated in most patients (including post-arthroplasty) because it does not improve clinical outcomes and only increases the risk of antimicrobial resistance and adverse drug events.

Anahtar Kavram

Asymptomatic bacteriuria diagnosis and antibiotic stewardship
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Infectious Diseases

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