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Related Concept Videos

Velocity and Acceleration in Steady and Unsteady Flow01:11

Velocity and Acceleration in Steady and Unsteady Flow

In fluid mechanics, velocity and acceleration are key concepts for analyzing particle motion in both steady and unsteady flow. Consider a fluid particle moving along a pathline, where its velocity depends on its position and time. The particle's acceleration is obtained by differentiating the velocity with respect to time.
The acceleration can be generalized to any point in the flow, and expressed as components along three perpendicular directions, representing changes in velocity over time.

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Related Experiment Video

Updated: May 12, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
11:00

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section

Published on: July 19, 2016

Stent effects on duplex velocity estimates.

Christopher S Kuppler1, Jason W Christie, William B Newton

  • 1Department of Vascular and Endovascular Surgery, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, USA.

The Journal of Surgical Research
|April 23, 2013
PubMed
Summary
This summary is machine-generated.

Doppler velocity criteria for in-stent restenosis are reliable. Balloon-expandable and self-expanding endoluminal stents minimally affect peak systolic velocity in renal and carotid arteries.

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Continuous Venous-Arterial Doppler Ultrasound During a Preload Challenge

Published on: January 20, 2023

Related Experiment Videos

Last Updated: May 12, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
11:00

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section

Published on: July 19, 2016

Monitoring the Wall Mechanics During Stent Deployment in a Vessel
08:28

Monitoring the Wall Mechanics During Stent Deployment in a Vessel

Published on: May 8, 2012

Continuous Venous-Arterial Doppler Ultrasound During a Preload Challenge
09:32

Continuous Venous-Arterial Doppler Ultrasound During a Preload Challenge

Published on: January 20, 2023

Area of Science:

  • Vascular imaging and hemodynamics
  • Medical device evaluation

Background:

  • Doppler-derived velocity criteria for in-stent restenosis are debated.
  • Percutaneous angioplasty and endoluminal stenting efficacy requires validation.

Purpose of the Study:

  • To evaluate Doppler-derived velocities in an in vitro model after stent placement.
  • To compare balloon-expandable stents (BES) and self-expanding endoluminal stents (SES).

Main Methods:

  • An in vitro vascular circuit model simulated renal and carotid artery flow.
  • Peak systolic velocity (PSV) and end diastolic velocity (EDV) were measured.
  • BES and SES were deployed, and velocities were re-assessed.

Main Results:

  • PSV increased slightly with SES (6.4%), which was statistically significant (P < 0.05).
  • No significant differences in EDV were observed across unstented, BES, and SES conditions.
  • Overall, PSV changes were less than 7% with SES presence.

Conclusions:

  • Doppler velocity estimates for renal and carotid arteries are not materially affected by BES or SES.
  • Current Doppler criteria for assessing in-stent restenosis remain largely valid.