Renal resistive index

1. Renal resistive index has no effect on clinical model discrimination for coronary artery calcification in humans (AUC 0.782 vs. 0.819; DeLong p = 0.129).

   “did not significantly improve discrimination (AUC 0.782 vs. 0.819; DeLong p = 0.129).”

   HumansAdding renal resistive index to the clinical model in patients with preserved renal functionn = 120

   Association of renal resistive index with coronary artery calcification in patients with preserved renal function

   Journal of ultrasound·Oct 15, 2026

1. age increases renal resistive index in dogs (0.663 vs 0.613 mean).

   “In geriatric dogs, these values increased to 0.663 ± 0.064 (95% CI: 0.630 - 0.695) for RRI and 1.305 ± 0.263 (95% CI: 1.170 - 1.440) for RPI.”

   Animalscompared to dogs younger than 11 years

   Study of renal resistive index and renal pulsatility index in non-azotaemic healthy dogs segmented by age group

   Veterinary journal (London, England : 1997)·May 27, 2026

1. Trunk flexibility decreases renal resistive index in humans (β = -0.135, P = 0.027).

   “and RI (β = -0.135, P = 0.027).”

   Humansn = 175

   Association between trunk flexibility and renal flow pulsatility in middle-aged and older adults

   Experimental gerontology·Dec 13, 2022

1. Renal resistive index is associated with CAD-RADS category in humans.

   “RRI also differed across CAD-RADS categories (p < 0.001).”

   HumansPreserved renal function; exploratory, unadjusted analysiscoronary arteryn = 120

   Association of renal resistive index with coronary artery calcification in patients with preserved renal function

   Journal of ultrasound·Oct 15, 2026

More on CAD-RADS category

1. Renal resistive index is associated with coronary artery calcium score in humans (r = 0.474).

   “and correlated with CACS (r = 0.474, p < 0.001).”

   HumansPreserved renal function; exploratory, unadjusted analysiscoronary arteryn = 120

   Association of renal resistive index with coronary artery calcification in patients with preserved renal function

   Journal of ultrasound·Oct 15, 2026

More on Coronary artery calcium score

1. Renal resistive index is associated with coronary artery calcification in humans (Adjusted OR 1.137 per 0.01-unit increase, 95% CI 1.041–1.242).

   “each 0.01-unit increase in RRI was independently associated with higher odds of CACS > 0 (adjusted OR 1.137, 95%CI 1.041-1.242; p=0.005).”

   HumansPreserved renal function; adjusted for age, sex, hypertension, diabetes mellitus, smoking, and dyslipidaemian = 120

   Association of renal resistive index with coronary artery calcification in patients with preserved renal function

   Journal of ultrasound·Oct 15, 2026

More on Coronary artery calcification

1. age is associated with renal resistive index in dogs (ρ = .41, p < .001).

   “revealing a moderate significant correlation between age and both indices (RRI ρ =.41, p < .001; RPI ρ =.40, p < .001).”

   Animalsin non-azotemic healthy dogs

   Study of renal resistive index and renal pulsatility index in non-azotaemic healthy dogs segmented by age group

   Veterinary journal (London, England : 1997)·May 27, 2026