Renal Resistive Index: Revisited

Area of Science:

• Nephrology
• Radiology
• Internal Medicine

Background:

• Chronic kidney disease (CKD) poses a significant global health challenge, with diabetes being a leading cause.
• Renal biopsy, while definitive, is invasive; non-invasive methods for assessing renal health are crucial.
• Duplex Doppler sonography offers a non-invasive approach to evaluate intrarenal hemodynamics via the renal resistive index (RRI).

Purpose of the Study:

• To assess intrarenal hemodynamic abnormalities using RRI in diabetic and non-diabetic CKD patients.
• To correlate RRI with established markers of renal dysfunction, including estimated glomerular filtration rate (eGFR) and biochemical parameters.
• To determine the utility of RRI in differentiating etiopathogenesis in early-stage CKD.

Main Methods:

• Duplex Doppler sonography was employed to measure the renal resistive index (RRI).
• RRI values were analyzed in patients with diabetic and non-diabetic chronic kidney disease.
• Statistical correlation was performed between RRI, eGFR, and serum creatinine levels.

Main Results:

• A significant correlation was observed between RRI, eGFR, and serum creatinine, supporting RRI's role as a complementary Doppler parameter.
• Distinct differences in RRI values were noted between diabetic and non-diabetic groups, even in early CKD stages.
• The study found that RRI increases sequentially, reflecting a decline in renal function.

Conclusions:

• Sonographic parameters, specifically RRI, can enhance the comprehensive evaluation of CKD in both diabetic and non-diabetic individuals.
• A sequential increase in RRI is a more reliable indicator of progressive renal function decline than a single absolute value.
• RRI shows promise in aiding the early identification of etiopathogenesis in chronic kidney disease.