Comparison of in Vivo Arteriovenous Fistula Volume Flow Measurements Using a Transonic Transit-Time Ultrasound Flow Device and Doppler Ultrasound

2014 
IntroductionDoppler ultrasound (US) is extensively validated for classification of vascular disease based on velocity calculations. Although widely used to evaluate dialysis access arteriovenous fistulas (AVF), accurate volume flow measurements have proved more elusive, with significant variability resulting in large thresholds for differentiation of normally functioning from failing fistulae. We sought to compare in vivo measurements of AVF blood flow volume measured by the Transonic transit-time ultrasound flow device with those of Doppler US.MethodsBilateral femoral AVFs (n = 6) were created in swine (n = 3). Comparative volume flow measurements were made at baseline, 15, 30, 60, and 120 minutes after the creation of AVFs with the Transonic device and with Doppler US using an estimated time averaged velocity and the diameter of the vessel to calculate volume flow using the formula: Q = v A = v (πr2), where Q = volume flow, v = time and spatial averaged mean velocity, A = cross-sectional area, and r = r...
    • Correction
    • Source
    • Cite
    • Save
    • Machine Reading By IdeaReader
    23
    References
    0
    Citations
    NaN
    KQI
    []