We acknowledge the efforts made by the authors of this article in researching this important topic and would like to make the following comments: Thomas incorrectly used a criteria of a 50% increase or decrease in peak systolic velocities with the duplex scan (). Haynes data suggested that an 85% or more could indicate such, while there was no data to support any percentage less than this (). The duplex results in Haynes’s study for the peak systolic velocities of the 5 arteries that showed marked decreases at end rotation were: 10.1cm/s, 22.3cm/s, 21.6cm/s, 20.2cm/s, 22.9cm/s, which indicates that when peak systolic velocities are in the low 20s or lower, velocimetry will likely indicate a positive finding (). It is a better way of defining the criteria for positive duplex results. This i…
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