Urosepsis – Pathology and Treatment
What is Urosepsis?
Urosepsis is sepsis originating from the urinary tract.
Usually it starts as a urinary tract infection (UTI) that spreads to the kidneys and then into the bloodstream, producing a systemic inflammatory response.
Common organisms:
- E. coli (most common)
- Klebsiella
- Proteus
- Pseudomonas
- Enterococcus
Pathology (Pathophysiology)
1. Initial urinary infection
Bacteria enter through the urethra and infect:
- bladder → cystitis
- kidney → pyelonephritis
Risk factors:
- urinary obstruction (stones, enlarged prostate)
- catheterization
- diabetes
- elderly patients
- immunocompromised state
2. Bacterial spread
Bacteria and toxins enter the bloodstream → bacteremia.
This activates:
- macrophages
- neutrophils
- cytokines (TNF-α, IL-1, IL-6)
3. Systemic inflammatory response
Inflammatory mediators cause:
- vasodilation
- capillary leak
- hypotension
- tissue hypoperfusion
This may progress to:
- septic shock
- multi-organ dysfunction
Organs affected:
- kidneys → acute kidney injury
- lungs → ARDS
- brain → confusion
- heart → circulatory collapse
Clinical Features
Symptoms of UTI
- dysuria
- frequency
- urgency
- flank pain
- fever
Features of sepsis
- fever or hypothermia
- tachycardia
- tachypnea
- hypotension
- confusion
- reduced urine output
Severe cases:
- septic shock
- organ failure
Investigations
Laboratory tests
- CBC → leukocytosis
- CRP / Procalcitonin ↑
- Serum lactate ↑
- Renal function tests
Cultures
- urine culture
- blood culture
Imaging
- Ultrasound KUB
- CT abdomen/pelvis if obstruction suspected
Treatment
1. Immediate resuscitation
IV Fluids
- Crystalloids (normal saline or Ringer’s lactate)
- Restore blood pressure and perfusion
2. Antibiotics (start early)
Broad-spectrum IV antibiotics should be started urgently.
Examples:
- Ceftriaxone
- Piperacillin–tazobactam
- Meropenem (severe resistant infection)
Then adjust according to culture sensitivity.
Early antibiotics significantly improve survival.
3. Source control
Important step.
Treat the cause:
- remove infected catheter
- relieve urinary obstruction
- drain abscess
- manage stones
4. Vasopressors
If hypotension persists after fluids:
- norepinephrine is first-line
Used in septic shock.
5. Supportive management
- Oxygen therapy
- Mechanical ventilation if needed
- Dialysis if renal failure occurs
- ICU monitoring in severe cases
Complications
- Septic shock
- Acute kidney injury
- DIC
- Multi-organ failure
- Death
Prognosis
Outcome depends on:
- early diagnosis
- rapid antibiotic therapy
- control of infection source
- patient age/comorbidities
Early treatment has good survival rates. Delayed treatment increases mortality significantly.