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Intrarenal Doppler: characteristics of aging kidneys
J D Terry1, J A Rysavy, M P Frick
1Section of Radiology, Creighton University Medical Center, Omaha, Nebraska 68131.
Summary
Renal Doppler resistive index (RI) varies with age, with the highest values in very young and older adults. These age-related changes in Doppler findings should be considered during kidney assessments.
Area of Science:
- Nephrology
- Radiology
- Vascular Ultrasound
Background:
- Normal Doppler findings in native kidneys lack extensive study.
- Renal Doppler resistive index (RI) is a key indicator of kidney vascular health.
- Understanding normal variations is crucial for accurate diagnosis.
Purpose of the Study:
- To correlate Doppler resistive index (RI) variations with age in healthy individuals.
- To establish age-specific normal ranges for renal Doppler measurements.
- To investigate the impact of aging on renal vascular resistance.
Main Methods:
- Retrospective analysis of Doppler ultrasound data.
- Inclusion of patients without renal risk factors or known renal disease.
- Correlation of renal resistive index (RI) values with patient age groups.
Main Results:
- Youngest (<1 year) and oldest (>59 years) age groups showed highest mean RI (0.73 and 0.68, respectively).
- The 20-39 year age group exhibited the lowest mean RI (0.59).
- Overall mean RI across all ages was 0.63, with significant age-related variability.
Conclusions:
- Renal Doppler resistive index (RI) demonstrates significant age-related variability.
- Age-specific reference ranges for renal Doppler are necessary for accurate interpretation.
- Consideration of age-related changes is recommended for clinical assessment of renal vascular status.