Pseudomonas Aeruginosa Infection in Urinary Tract

Primary Routes of Introduction

• Urinary catheters are the most significant risk factor for Pseudomonas in urine, with bacteria entering via either the intraluminal or extraluminal route 1
• Intraluminal route: Bacteria enter through the catheter lumen when the closed drainage system is compromised or when bacteria ascend from a contaminated collection bag (34-42% of cases) 2
• Extraluminal route: Bacteria migrate along the outside surface of the catheter from the urethral meatus into the bladder 3
• Biofilm formation on catheters protects bacteria from antibiotics and the host immune response, facilitating persistent infection 2

Risk Factors for Pseudomonas in Urine

• Immunocompromised status (cancer patients, etc.) 1
• History of recurrent urinary tract infections 1
• Uncontrolled diabetes 1
• History of infected renal stones 1
• Structural abnormalities of the urinary tract 4

Prevention Strategies

• Only use catheters when absolutely necessary and remove as soon as possible 1
• Maintain a closed drainage system at all times 2
• Keep the collection bag below the level of the bladder 2
• Avoid routine irrigation of catheters, which doesn't reduce infection risk 3
• Do not add antimicrobials or antiseptics to drainage bags (ineffective) 2

Treatment Considerations

• Polymicrobial infections are common in catheter-associated UTIs, with up to 50% involving multiple organisms 1
• Asymptomatic bacteriuria in catheterized patients should not be treated with antibiotics 1