Should a 71-year-old man with benign prostatic hyperplasia, a chronic Foley catheter, recent Proteus catheter-associated urinary tract infection treated with levofloxacin and currently on ceftriaxone, who now has scrotal pain and a contaminated urine culture, receive an urgent scrotal/testicular Doppler ultrasound and urgent urology follow-up for catheter exchange with repeat urinalysis and culture, and have ceftriaxone discontinued after a seven‑day course rather than extended?

Management of Scrotal Pain in a Catheterized Patient with Recent CAUTI

Yes, obtain an urgent scrotal ultrasound with Doppler immediately to evaluate for epididymitis, orchitis, or abscess, arrange urgent urology follow-up for catheter exchange with repeat culture from the new catheter, and discontinue ceftriaxone after completing the 7-day course given the contaminated culture and clinical improvement.

Rationale for Scrotal Imaging

New scrotal pain in this clinical context is concerning for epididymitis, which occurs in up to 90% of cases from pathogen migration from the urethra or bladder 1. Given his chronic Foley catheter and recent Proteus CAUTI, he is at high risk for ascending infection. The 2024 EAU guidelines explicitly recommend urgent evaluation when scrotal symptoms develop, as the diagnostic algorithm for acute scrotal pain prioritizes ruling out torsion first, then evaluating for infectious causes 1.

Key clinical pitfall: Do not delay imaging based on the contaminated culture result. The contaminated specimen does not exclude active infection—it simply means you need a proper specimen after catheter exchange. Scrotal pain represents a new anatomical site of potential infection that requires immediate assessment.

Catheter Management Strategy

Catheter exchange is mandatory for two critical reasons 1:

• Management of the underlying complicating factor is strongly recommended for all complicated UTIs 1. The chronic Foley itself is the primary complicating factor and source of recurrent infection
• Proper specimen collection requires catheter replacement in CAUTI cases. Cultures obtained from chronically indwelling catheters are unreliable due to biofilm colonization 2, 3

The contaminated culture you obtained reflects the polymicrobial biofilm on the existing catheter surface rather than true invasive infection. Proteus species are notorious for forming crystalline biofilms on catheters, leading to encrustation and serving as a nidus for recurrent infection 3.

Antibiotic Duration Decision

Discontinue ceftriaxone after 7 days based on the following evidence 1:

• Treatment duration of 7 days is appropriate for hemodynamically stable patients who have been afebrile for at least 48 hours 1
• The guideline specifically states 7-14 days for complicated UTI in men (14 days when prostatitis cannot be excluded) 1
• Your patient has clinically improved with resolution of urinary symptoms, indicating treatment response
• The contaminated culture provides no actionable data to guide extended therapy

However, reassess after catheter exchange: If the new culture from the fresh catheter grows a pathogen and he has epididymitis confirmed on ultrasound, you will need to restart appropriate antibiotics based on susceptibilities. Epididymitis typically requires treatment targeting Enterobacterales (the likely pathogens given his history) 1.

Specific Management Algorithm

Immediate actions (today):

1. Order STAT scrotal ultrasound with Doppler
2. Contact urology for urgent catheter exchange
3. Collect urine culture from the newly placed catheter using aseptic technique
4. Complete the 7-day ceftriaxone course but do not extend it

If ultrasound confirms epididymitis:

• Initiate empiric therapy covering Enterobacterales while awaiting new culture results 1
• Consider parenteral therapy if severe infection 1
• The 2024 EAU algorithm recommends single antibiotic or combination therapy active against Enterobacterales for epididymitis when gonorrhea is unlikely (which applies here given his age and chronic catheter) 1

If ultrasound shows abscess:

• Requires drainage in addition to antibiotics 1
• Urgent urology intervention needed

If new culture grows organism:

• Tailor antibiotics to susceptibilities
• Treat for 7-14 days depending on clinical response and whether prostatitis is suspected 1

Critical Risk Factors in This Patient

This 71-year-old has multiple high-risk features for complicated outcomes 1, 4:

• Chronic catheterization (the single most important risk factor for CAUTI) 1
• BPH with urinary retention (underlying urological abnormality requiring management) 1, 5, 4
• Recent Proteus CAUTI (Proteus forms crystalline biofilms and causes catheter encrustation) 3
• Male sex with UTI (automatically classified as complicated UTI) 1

The mortality associated with CAUTI-related bacteremia is approximately 10% 1, making aggressive evaluation and source control essential.

Avoiding Common Pitfalls

Do not:

• Treat based on the contaminated culture—it's clinically meaningless
• Delay imaging because he's "stable"—epididymitis can progress to abscess or Fournier's gangrene
• Continue antibiotics indefinitely without a clear indication
• Ignore the underlying BPH—this needs definitive urological management to prevent recurrence 1, 5

Do:

• Act urgently on new anatomical site symptoms (scrotal pain)
• Replace the catheter before obtaining diagnostic specimens
• Coordinate closely with urology for both acute management and long-term catheter alternatives 6