Since 2011, there has been increasing application of ultrasound assessment to help guide the choice of AVF creation site with minimum vessel diameters of 2 mm.
The higher variation coefficient for minimum diastolic velocity and the minimal variation in vessel diameter despite the fact that a clear-cut protocol was followed probably occurred because of the lack of variation in the vessels along their routes and the fact that velocity depends on various factors (measurement site, sample volume reaching the whole vessel diameter, and animal behavior).
A higher variation coefficient was observed for minimum diastolic velocity, and minimal variation were seen in vessel diameter and resistance index (Table 3).
Pasklinsky and colleagues used a definition of dilatation to more than three times the native vessel diameter, with the minimum size being 2 cm.
Data are proportion and number of participants for sex, diabetes, clinical presentation, and pattern of in-stent restenosis; data are pooled mean or median for age, length on in-stent restenosis, minimum lumen diameter (MLD), and reference vessel diameter (RVD).
The average, standard deviation, and variation coefficient for the minimum diastolic velocity, systolic peak velocity, vessel diameter, pulsatility index and resistance index of both the right and left common carotid arteries and their respective genders are shown in Table 2.
No statistical differences were found between genders or carotid artery sides for minimum diastolic velocity (p = 0.838 and 0.193, respectively), systolic peak velocity (p = 0.256 and 0.885, respectively), vessel diameter (p = 0.216 and 0.590, respectively), pulsatility index (p = 0.671 and 0.356, respectively), or resistance index (p = 0.595 and 0.356, respectively).
Due to the diameter variation of the vessels, the vesselness measure R x) is only high at a certain scale related to the vessel diameter.
Dr. Brewer said, "You can get enormous changes in vessel wall pathology and little change in the lumen, the vessel diameter".
