What is it about?
The average resistive index (RI) as a function of the average vessel diameter (D) was studied in the human carotid arterial tree. Data were used from 505 different vessels of 371 healthy humans. When the RI from the carotid arteries was included in the data set the standard trend lines did not give efficient fits. However, when only data from the eye were used, the Neperian logarithmic function gave the best fit [RI = 4 Ln(D) + 44] with a correlation coefficient r = 0.99 and an absolute relative error less than 2.6%.
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Why is it important?
1) The average RI value became available, for the first time, at both the feeding artery and its most distal branches of the whole arterial tree of a human organ (eye). 2) It is a prerequisite for the correct estimation of other hemodynamic factors such as volume flow and wall shear stress. 3) It is useful for the design of computer and experimental hemodynamic models. 4) The logarithmic model could be proved a valuable tool in clinical practice (arterial blockage).
Perspectives
1) The average RI value became available, for the first time, at both the feeding artery and its most distal branches of the whole arterial tree of a human organ (eye). 2) It is a prerequisite for the correct estimation of other hemodynamic factors such as volume flow and wall shear stress. 3) It is useful for the design of computer and experimental hemodynamic models. 4) The logarithmic model could be proved a valuable tool in clinical practice (arterial blockage).
Dr Aristotle G Koutsiaris
University of Thessaly
Read the Original
This page is a summary of: The resistive index as a function of vessel diameter in the human carotid arterial tree, Microvascular Research, September 2013, Elsevier,
DOI: 10.1016/j.mvr.2013.06.005.
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