How Increased Kidney Pressure Leads to More Bacteria in the Bloodstream

What is it about?

The study investigates the reabsorption of irrigation fluid and bacteria into the venous system during ureterorenoscopy (URS) at varying intrarenal pressures (IRPs). Using porcine models both in vivo and ex vivo, researchers measured fluid and bacterial reabsorption at incrementally raised IRPs. In vivo experiments involved six female pigs under anesthesia, demonstrating that pyelovenous backflow of bacteria like E. coli increases exponentially with IRP, leading to bacteraemia. The study shows bacteraemia can occur at IRPs between 30 and 120 mmHg, with an average IRP of 77 mmHg. The introduction highlights the risk of urosepsis due to high IRPs during URS, while the discussion points to the need for clear guidelines on safe irrigation pressures to prevent complications linked to pyelovenous backflow.

Featured Image

Why is it important?

This research is important as it provides crucial insights into the risks associated with ureterorenoscopy (URS), particularly the potential for pyelovenous backflow of irrigation fluids and bacteria into the renal vascular system under raised intrarenal pressures (IRPs). Understanding these risks is essential for improving patient safety during such procedures and for developing guidelines that minimize the risk of complications such as urosepsis. The study's findings contribute to the body of knowledge regarding the safe limits of irrigation pressures and IRPs, which could lead to improved clinical practices and outcomes in endoscopic kidney surgeries. Key Takeaways: 1. Risk of Bacteraemia: The study demonstrates that bacteraemia, specifically with E. coli, can occur at IRPs as low as 30 mmHg and increases significantly with higher pressures, highlighting the need for careful monitoring and control of IRPs during URS to prevent infection-related complications. 2. Exponential Increase in Backflow: The research reveals that pyelovenous backflow and the associated risk of bacteraemia increase exponentially after 60 mmHg IRP, suggesting a critical threshold that should be considered when setting safe operating pressures during URS. 3. Implications for Clinical Practice: The findings underscore the importance of establishing and adhering to safe IRP limits during endoscopic procedures to reduce the risk of severe complications like urosepsis, which is a leading cause of mortality following URS.