9.3 Acute Genitourinary Emergencies & Severe Urosepsis

9.3 Acute Genitourinary Emergencies & Severe Urosepsis

Clinical Scenario: A 62-year-old male with poorly controlled type 2 diabetes (HbA1c 10.4%) and BPH presents with acute right flank pain, rigors, confusion, and vomiting. Vital signs: BP 78/44 mmHg (MAP 55 mmHg), HR 128 bpm, RR 26 breaths/min, temperature 39.4°C (102.9°F). Exam reveals right costovertebral angle tenderness and mottled skin. Labs show WBC 24,800/mcL with 22% bands, serum creatinine 3.4 mg/dL (baseline 1.1 mg/dL), and lactate 4.8 mmol/L. Non-contrast CT reveals a 7 mm obstructing right ureterovesical junction calculus with severe hydronephrosis and perinephric stranding.

Infected Hydronephrosis & Obstructive Uropathy: Surgical Emergencies

An obstructing calculus accompanied by upper urinary tract infection constitutes an absolute urological surgical emergency. Mechanical obstruction causes intraluminal renal pelvic pressure to exceed glomerular capillary perfusion pressure, creating a pressurized closed infection (pyonephrosis). This high pressure drives bacteria and endotoxins retrogradely across fornices into renal venules and lymphatics (pyelovenous backflow), causing rapid bacteremia, refractory septic shock, and renal parenchymal necrosis.

• Diagnostic Evaluation: Non-contrast helical CT of the abdomen/pelvis is the diagnostic gold standard, identifying calculus location, stone burden, and hydronephrosis. Bedside point-of-care ultrasound (POCUS) rapidly confirms pelvicalyceal dilation in hemodynamically unstable patients unable to travel to radiology.
• Urgent Surgical Management:
  1. Immediate Decompression: Emergent decompression of the collecting system must be performed within hours of resuscitation.
  2. Decompression Modalities:
     • Retrograde Ureteral Stent (Double-J Stent): Placed cystoscopically under fluoroscopic guidance by urology.
     • Percutaneous Nephrostomy (PCN) Tube: Inserted into the renal pelvis by interventional radiology under ultrasound guidance. Choose the fastest feasible drainage route with urology and interventional radiology, considering anatomy, procedural risk and available expertise.
  3. Critical Exam Trap: Primary stone fragmentation (shock wave lithotripsy [ESWL] or ureteroscopy) is strictly contraindicated during acute infection. Energy delivery and high-pressure irrigation disrupt infected urothelium, triggering massive endotoxin release and fatal septic shock. Definitive stone extraction is deferred until sepsis has fully resolved.
  4. Resuscitation: Early balanced crystalloids, norepinephrine for MAP $\ge 65$ mmHg, and immediate broad-spectrum IV antimicrobials.

Severe Complicated Pyelonephritis & Urosepsis Pathogens

Current IDSA guidance describes complicated UTI as infection extending beyond the bladder, including pyelonephritis and febrile or bacteremic UTI. Obstruction, urinary devices and other patient factors influence evaluation and treatment.

• Microbiology:
  • Escherichia coli remains the most common uropathogen.
  • Other common uropathogens: Klebsiella pneumoniae, Proteus mirabilis, Enterobacter cloacae, Pseudomonas aeruginosa, and Enterococcus faecalis/faecium.
  • Proteus mirabilis produces urease, which hydrolyzes urea into ammonia, alkalinizing urine (pH $> 7.5$) and precipitating magnesium ammonium phosphate to form large struvite (staghorn) calculi that harbor persistent bacterial colonies.
• Extended-Spectrum Beta-Lactamase (ESBL) Risk Stratification:
  • ESBL Enterobacterales hydrolyze penicillins, cephalosporins, and aztreonam.
  • Risk factors: Prior ESBL colonization/infection, antibiotic use within 90 days (cephalosporins/quinolones), healthcare exposure, and indwelling urinary devices.
• Empiric Antimicrobial Regimens: Adjust maintenance doses for kidney function and use culture results to narrow therapy.
  • Severe Urosepsis / High ESBL Risk: Carbapenems are first-line (Meropenem 1 g IV q8h or Imipenem-cilastatin 500 mg IV q6h). MERINO studied ceftriaxone-resistant E. coli or Klebsiella bloodstream infection. Piperacillin-tazobactam did not meet noninferiority to meropenem for 30-day mortality.
  • Severe Urosepsis / Low ESBL Risk: Cefepime 2 g IV q8h OR Piperacillin-tazobactam 4.5 g IV q6h.
  • Route Matters: Nitrofurantoin and oral fosfomycin are unsuitable for initial severe pyelonephritis/urosepsis treatment because of inadequate tissue/serum exposure. IV fosfomycin has a separate approved cUTI/acute-pyelonephritis indication and is a selected alternative, not routine empiric shock therapy.

Fournier Gangrene: Perineal Necrotizing Fasciitis

Fournier gangrene is a life-threatening polymicrobial necrotizing fasciitis of the perineal, scrotal, and perianal regions spreading along Colles, Dartos, and Scarpa fascia.

• Synergistic Pathophysiology: Infection may involve mixed aerobic and anaerobic organisms. Aerobes (E. coli, Klebsiella, Enterococcus, Staphylococcus aureus / MRSA, Streptococcus pyogenes) consume oxygen and release heparinases/collagenases, inducing endarteritis obliterans and microvascular thrombosis. The resulting ischemia fuels proliferation of gas-producing anaerobes (Bacteroides fragilis, Peptostreptococcus, Clostridium).
• Risk Factors: Poorly controlled diabetes mellitus, chronic alcoholism, morbid obesity, immunosuppression, perineal trauma, and SGLT-2 inhibitors.
• Clinical Presentation:
  • Early: Severe perineal pain out of proportion to exam, tenderness, low-grade fever.
  • Advanced: Tense scrotal/perineal edema, dusky purpuric discoloration, bullae, foul "dishwater" exudate, and palpable subcutaneous crepitus (gas in soft tissues). Septic shock develops rapidly.
• Management Triad:
  1. Immediate Radical Surgical Debridement: Time to surgery is the primary determinant of mortality. Emergent wide excision of all nonviable tissue in the OR is mandatory and must never be delayed for imaging.
  2. Broad Empiric Antimicrobial Therapy:
     • Broad Gram-Negative/Anaerobic: Piperacillin-tazobactam 4.5 g IV q6h OR Meropenem 1 g IV q8h.
     • MRSA Coverage: Vancomycin 15–20 mg/kg IV q8–12h (target AUC/MIC 400–600) OR Daptomycin 8–10 mg/kg IV daily.
     • Toxin Suppression: Consider clindamycin 900 mg IV q8h for suspected toxin-mediated infection. Documented group A streptococcal necrotizing fasciitis requires penicillin plus clindamycin.
  3. Aggressive Resuscitation: Early fluid resuscitation, vasopressors for MAP $\ge 65$ mmHg, and metabolic stabilization.

Urinary Tract Trauma

After blunt trauma, stable patients with gross hematuria, or microscopic hematuria plus hypotension, need contrast-enhanced CT assessment for renal injury; a concerning mechanism can also justify imaging without hematuria. Add delayed images when collecting-system or ureteral injury is suspected. Gross hematuria with pelvic fracture requires retrograde CT or conventional cystography to assess bladder rupture. Blood at the urethral meatus after pelvic trauma calls for retrograde urethrography before blind urethral catheterization. Obtain urgent urologic consultation and establish safe urinary drainage; repeated traumatic catheter attempts can worsen injury. Hemodynamic instability takes priority with trauma resuscitation and hemorrhage control.

Indicated Pelvic Examination

Pelvic pain, abnormal bleeding or discharge may require a pelvic examination tailored to the question. Explain each component, obtain consent, ensure privacy and offer an appropriate chaperone; respect a request to pause or stop. Inspect external tissues first. A speculum examination visualizes the vagina/cervix and permits indicated sampling; a bimanual examination assesses uterine/adnexal findings and tenderness. Use trauma-informed communication and the least examination needed to answer the clinical question. Interpret findings with pregnancy testing, infection testing or imaging as appropriate. An internal examination is not automatically required simply because a patient has a urinary complaint.

Catheter-Associated UTI (CAUTI) Diagnostic Stewardship

• NHSN Acute-Care SUTI1a Surveillance (2026):
  1. IUC present >2 consecutive calendar days in an inpatient location (insertion = day 1), and present on the event date or removed the day before.
  2. A qualifying symptom: fever >38°C, or suprapubic tenderness/CVA pain or tenderness without another recognized cause. Urgency, frequency and dysuria qualify only when no IUC is in place. Rigors/delirium alone do not satisfy this symptom list.
  3. Culture with ≤2 organism species, at least one a bacterium ≥100,000 CFU/mL; all criterion elements must fit the NHSN infection window. These reporting definitions do not replace clinical assessment of urinary and alternative infection sources.
• Asymptomatic Bacteriuria (ASB) vs CAUTI:
  • The Pyuria Fallacy: Pyuria, cloudy urine and odor are nonspecific and do not distinguish CAUTI from colonization or establish ASB. ASB requires quantitative bacterial growth on culture without attributable UTI symptoms; pyuria alone is not bacteriuria.
  • Diagnostic Stewardship: Do not routinely culture or treat asymptomatic catheterized patients; antibiotics add resistance and C. difficile risk without demonstrated benefit. Standard exceptions requiring screening/treatment include pregnancy and endourologic procedures with mucosal trauma. Obtain targeted cultures when clinically indicated.
• Prevention Bundles:
  • Restrict catheters to strict indications (urinary retention, hourly monitoring in shock, helping heal open sacral/perineal wounds in incontinent patients).
  • Maintain closed, dependent drainage below bladder level.
  • Daily review of catheter necessity and prompt discontinuation via nurse-driven removal protocols.