Transcutaneous flow measurements in in-situ bypasses: an assessment of duplex scanning.
Measurement of laminar flow using an ultrasound scanner was shown to have a high degree of correlation with quantified timed flows (r = 0.98, p less than or equal to .001). Sixty-one in-situ bypasses had flow assessed both proximally and distally. Mean fistula flow (proximal-distal flows) for time periods 1-8 weeks, 3 to 8, and 9+ months were 108, 85, and 16mls respectively. Distal bypass flow remained constant despite a significant decrease in fistula flow between the later time periods (p less than or equal to .001) (unpaired t-test). There was no evidence from the study that proximal flow through fistulas of varying resistances adversely affected the distal bypass flow.
D001164:Arteriovenous Fistula / Q000175:diagnosis; D001166:Arteriovenous Shunt, Surgical; D001783:Blood Flow Velocity; D003925:Diabetic Angiopathies / Q000601:surgery; D005263:Femoral Artery / Q000503:physiopathology; D006801:Humans; D007866:Leg / Q000098:blood supply*; D011150:Popliteal Artery / Q000503:physiopathology; D012501:Saphenous Vein / Q000601:surgery*; D013997:Time Factors; D014463:Ultrasonography; D014655:Vascular Resistance