title: Intrarenal Doppler: characteristics of aging kidneys.
abstract: The normal range of Doppler findings in native kidneys has not been studied extensively. This study correlates changes in Doppler resistive index (RI) with age in patients without renal risk factors or renal disease. Young and old patients demonstrated the highest RI values (age < 1, mean RI = 0.73; age > 59, RI = 0.68), and patients in the 20-39 year age group showed the lowest values (RI = 0.59). The mean RI for all ages was 0.63. The cause of this variability is unknown. We suggest that age-related changes in Doppler values should be considered in the interpretation of renal Doppler measurements.
authors.affiliation: Section of Radiology, Creighton University Medical Center, Omaha, Nebraska 68131.
authors.forename: J D
authors.initials: JD
authors.lastname: Terry
authors.forename: J A
authors.initials: JA
authors.lastname: Rysavy
authors.forename: M P
authors.initials: MP
authors.lastname: Frick
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D000704:Analysis of Variance; D001783:Blood Flow Velocity; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007668:Kidney / Q000000981:diagnostic imaging* / Q000502:physiology*; D008875:Middle Aged; D012016:Reference Values; D012079:Renal Circulation; D014463:Ultrasonography; D014655:Vascular Resistance