Document Detail

Influence of age on intrarenal resistive index measurement in normal subjects.
MedLine Citation:
PMID:  12592470     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: We investigated the influence of age on intrarenal arterial resistive index (RI) measurement in 135 normal subjects (71 male, 64 female; age range = 17-68 years, median age = 37 years). METHODS: Each subject underwent color Doppler measurement of the intrarenal RI from three distinct interlobar arteries in the superior, middle, and inferior parts of both kidneys. The mean of six RI values obtained from both kidneys was used for analysis. The correlation of RI with different variables was investigated by linear regression and stepwise multiple linear regression. Variables analyzed were age, systolic blood pressure, diastolic blood pressure, mean blood pressure, pulse pressure, and pulse rate. RESULTS: The results of linear regression showed that age had a significantly positive correlation ( r = 0.276, p = 0.0012) and diastolic blood pressure had a significantly negative correlation ( r = -0.186, p = 0.0311) with the RI. The results of stepwise multiple linear regression showed that the combination of age and diastolic blood pressure could explain approximately 15% of the RI changes ( r(2) = 0.1535). CONCLUSION: Although there is a statistically significant positive correlation between intrarenal RI and age, the correlation is weak. This suggests that the influence of age on RI measurement is small and may be of no clinical importance.
Z Y Lin; L Y Wang; M L Yu; C Y Dai; S C Chen; W L Chuang; M-Y Hsieh; J-F Tsai; W-Y Chang
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Abdominal imaging     Volume:  28     ISSN:  0942-8925     ISO Abbreviation:  Abdom Imaging     Publication Date:    2003 Mar-Apr
Date Detail:
Created Date:  2003-02-19     Completed Date:  2003-06-11     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9303672     Medline TA:  Abdom Imaging     Country:  United States    
Other Details:
Languages:  eng     Pagination:  230-2     Citation Subset:  IM    
Department of Internal Medicine, Kaohsiung Medical University Hospital, No.100 Shih-Chuan 1st Road, Kaohsiung 807, Taiwan, Republic of China.
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MeSH Terms
Age Factors
Blood Pressure
Linear Models
Prospective Studies
Renal Artery / physiology*,  ultrasonography
Ultrasonography, Doppler, Color
Vascular Resistance*

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