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Updated: Oct 30, 2025

Multilevel Microdissection and Functional-Structural Profiling of Human Renal Arterial Branches
Published on: September 5, 2025
Renal Resistive Index: Not Only for Kidney Clinics
Enrico Giustiniano1, Luca Pugliese1, Lorenzo Calabrò1
1Department of Anesthesia and Intensive Care - IRCCS, Humanitas Clinical and Research Hospital, Milan, Italy.
Abstract:
Renal Resistive Index (RRI) is a measurement of the resistance of the renal blood flow. A value higher than 0.70 is a marker of increased resistance and is correlated with kidney injury and its severity. Additionally, it may be associated with the mortality rate in the post-surgery population. In COVID-19 subjects, we found that high RRI has been associated with high levels of serum C-reactive protein, a marker of systemic inflammatory reaction syndrome. Finally, we propose RRI not only as a marker of kidney injury, but also as a tool to evaluate the course of critical illness.
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