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Hemodialysis I: Introduction01:25

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Hemodialysis (HD) is a medical treatment that artificially removes waste products, excess fluids, and toxins from the blood when the kidneys are no longer able to perform these functions effectively. In this process, blood is filtered through a semipermeable membrane, allowing for the selective removal of waste while preserving necessary components like blood cells and proteins. Hemodialysis is typically performed in patients with end-stage renal disease (ESRD) or severe kidney...
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Flow Complexity Estimation in Dysfunctional Arteriovenous Dialysis Fistulas using Vector Flow Imaging.

Tin-Quoc Nguyen1, Marie Sand Traberg2, Jacob Bjerring Olesen3

  • 1Department of Diagnostic Radiology, Rigshospitalet, Copenhagen, Denmark; Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.

Ultrasound in Medicine & Biology
|June 30, 2020
PubMed
Summary
This summary is machine-generated.

Vector concentration offers a non-invasive method to assess arteriovenous dialysis fistula (AVF) stenosis severity. This flow complexity measure correlates well with digital subtraction angiography, outperforming peak velocity in dysfunctional AVFs.

Keywords:
Arteriovenous dialysis fistulaDigital subtraction angiographyFlow complexityPatient studyPhantom studySpectral Doppler ultrasoundStenosis assessmentVector flow imaging

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Area of Science:

  • Vascular Ultrasound
  • Hemodynamics
  • Medical Imaging

Background:

  • Non-invasive monitoring of arteriovenous dialysis fistulas (AVFs) is crucial for patient care.
  • Assessing stenosis severity in AVFs is essential for timely intervention.
  • Current methods may have limitations in accurately evaluating complex flow patterns.

Purpose of the Study:

  • To determine if vector concentration can accurately assess stenosis severity in dysfunctional AVFs.
  • To compare the efficacy of vector concentration with traditional Doppler peak velocity measurements.
  • To evaluate the impact of aliasing on vector concentration in severe stenoses.

Main Methods:

  • Vector concentration was measured in stenotic phantoms and 12 patients with dysfunctional AVFs.
  • Spectral Doppler peak velocity was also recorded in patients.
  • Digital subtraction angiography (DSA) was performed on 5 patients for gold-standard comparison.

Main Results:

  • Vector concentration showed an inverse relationship with stenosis severity in phantoms, less affected by aliasing.
  • In patients, vector concentration strongly correlated with stenosis severity (r = -0.73 to -0.69) and mid-stenotic diameter (r = 0.70 to 0.87).
  • Peak velocities did not show significant correlation with stenosis severity (p > 0.05).

Conclusions:

  • Vector concentration is a promising non-invasive tool for assessing AVF stenosis severity.
  • It is less susceptible to aliasing artifacts compared to peak velocity in severe stenoses.
  • Vector concentration provides a reliable alternative for evaluating dysfunctional AVFs, correlating well with DSA findings.