Changes in intrarenal blood flow during sepsis

Area of Science:

• Nephrology
• Physiology
• Sepsis Research

Background:

• Sepsis is a life-threatening condition characterized by dysregulated host response to infection.
• Intrarenal hemodynamics play a critical role in maintaining kidney function, especially during systemic illness.
• Understanding blood flow changes in the kidney during sepsis is crucial for managing septic complications.

Purpose of the Study:

• To investigate the effects of sepsis on intrarenal hemodynamics in a canine model.
• To quantify changes in renal blood flow distribution between the outer and inner cortex during sepsis.
• To explore the relationship between altered renal hemodynamics and kidney function in septic states.

Main Methods:

• Utilized radioactive microspheres (85Sr or 141Ce) to measure renal blood flow in nine dogs.
• Injected microspheres before and after the induction of sepsis to assess hemodynamic changes.
• Analyzed microsphere trapping in different renal cortical regions (outer and inner cortex).

Main Results:

• Total renal microsphere trapping increased significantly (30.6%) post-sepsis induction.
• Glomerular filtration rate remained unchanged.
• Microsphere trapping increased in the outer cortex (36.9%) and inner cortex (20.3%), indicating increased renal blood flow.
• Fractional distribution shifted towards the outer cortex (70.0% to 73.4%).

Conclusions:

• Sepsis induces renal vasodilatation and increased overall renal blood flow.
• A significant shift in intrarenal blood flow favoring the outer cortex occurs during sepsis.
• Altered blood flow patterns, potentially involving shunting or dilated vessels, may contribute to decreased renal function in sepsis.