A 71-year-old man with a history of a cerebrovascular accident and neurogenic bladder mana… — USMLE Step 2 CK

A 71-year-old man with a history of a cerebrovascular accident and neurogenic bladder managed with a chronic indwelling urethral catheter is evaluated during a routine home health visit. He reports feeling well and denies fever, chills, flank pain, suprapubic discomfort, or increased spasticity. His temperature is $37.0^\circ\text{C}$ ( $98.6^\circ\text{F}$ ), blood pressure is $130/80\text{ mmHg}$ , heart rate is $76/\text{min}$ , and respiratory rate is $14/\text{min}$ . Physical examination reveals a soft, non-tender abdomen and no costovertebral angle tenderness. The urine in his collection bag appears cloudy. A urinalysis reveals positive leukocyte esterase and $30$ white blood cells per high-power field. A urine culture obtained 48 hours ago grows $>100,000\text{ CFU/mL}$ of *Pseudomonas aeruginosa*. Which of the following is the most appropriate next step in management?

A
Prescribe a 7-day course of oral ciprofloxacin
B
Admit to the hospital for intravenous piperacillin-tazobactam
Observation without antimicrobial therapyAnswer
D
Administer a single dose of intravenous ceftriaxone
E
Remove the catheter and prescribe oral nitrofurantoin

Answer

Observation without antimicrobial therapy.

The correct approach is observation without antimicrobial therapy. This patient presents with classic asymptomatic bacteriuria in the setting of a chronic indwelling urinary catheter. Virtually all patients with chronic indwelling catheters will develop bacteriuria (positive urine culture) and pyuria (white blood cells in the urine) within a few weeks due to biofilm formation. Because the patient is entirely asymptomatic, hemodynamically stable, and lacks signs of invasive infection, treating the culture result constitutes poor antibiotic stewardship. Eradicating the colonizing bacteria does not improve clinical outcomes and only serves to increase the risk of adverse drug events and the emergence of multidrug-resistant organisms.

Step-by-Step Solution

Assess the patient for signs and symptoms of systemic or localized infection.

The patient is afebrile, hemodynamically stable, and has no localizing symptoms such as suprapubic pain or costovertebral angle tenderness.

Differentiating between a true urinary tract infection and asymptomatic colonization is the critical first step in management.

Interpret the urinalysis and urine culture findings in the context of an indwelling catheter.

The presence of pyuria and >100,000 CFU/mL of Pseudomonas aeruginosa indicates bacteriuria, which is a universal and expected finding in chronically catheterized patients.

Chronic foreign bodies in the urinary tract inevitably become colonized with bacteria, leading to chronic pyuria and positive cultures.

Determine the appropriate intervention based on established antibiotic stewardship guidelines.

No antibiotics are prescribed.

Treatment of asymptomatic bacteriuria is contraindicated except in specific populations (e.g., pregnant women, patients undergoing urologic procedures), as it promotes antimicrobial resistance.

Key Concept

Management of asymptomatic bacteriuria and catheter colonization.

Estimated Time:1m 0s

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