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Related Experiment Video

Updated: May 23, 2026

Imaging In-Stent Restenosis: An Inexpensive, Reliable, and Rapid Preclinical Model
09:46

Imaging In-Stent Restenosis: An Inexpensive, Reliable, and Rapid Preclinical Model

Published on: September 14, 2009

Low resolution limits and inaccurate algorithms decrease significantly the value of late loss in current drug-eluting

Johannes B Dahm1, Frank van Buuren

  • 1Department of Cardiology-Angiology, Heart and Vascular Center Neu-Bethlehem, Humboldtallee 6, 37073 Göttingen, Germany.

International Journal of Vascular Medicine
|April 11, 2012
PubMed
Summary

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Quantitative coronary angiography (QCA) and vascular angiography (QVA) are gold standards for restenosis. Late loss calculations are unrealistic due to QCA limitations, necessitating improved methods for drug-eluting stent evaluation.

Area of Science:

  • Cardiovascular imaging
  • Interventional cardiology
  • Medical device evaluation

Background:

  • Quantitative coronary angiography (QCA) and vascular angiography (QVA) are the gold standard for evaluating restenosis.
  • Late loss is a common parameter for assessing device efficacy but has limitations in evaluating restenotic tissue.
  • Current clinical practices result in unrealistic late loss calculations, particularly in the drug-eluting stent (DES) era.

Purpose of the Study:

  • To highlight the limitations of late loss calculations in current QCA/QVA practices.
  • To underscore the need for improved methodologies in evaluating DES efficacy.
  • To propose alternative parameters for more accurate restenosis assessment.

Main Methods:

  • Analysis of the inherent resolution and calibration limits of QCA/QVA.

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Monitoring the Wall Mechanics During Stent Deployment in a Vessel
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Monitoring the Wall Mechanics During Stent Deployment in a Vessel

Published on: May 8, 2012

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Last Updated: May 23, 2026

Imaging In-Stent Restenosis: An Inexpensive, Reliable, and Rapid Preclinical Model
09:46

Imaging In-Stent Restenosis: An Inexpensive, Reliable, and Rapid Preclinical Model

Published on: September 14, 2009

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

  • Evaluation of systematic and random errors in measurements taken at two different time points.
  • Comparison of late loss with other potential metrics for restenosis evaluation.

    • Main Results:

    • Smaller differences in late loss are often within the resolution limits of QCA, especially for DES.
    • Late loss calculations are affected by errors from dual time-point measurements and QCA limitations.
    • The current late loss parameter has limited value in discriminating small differences between various DES.

    Conclusions:

    • Late loss calculations in current clinical practice are unrealistic and limited.
    • Late lumen area loss and defined algorithms like MLD-relocation should be prioritized in future DES studies.
    • Adopting improved methodologies is crucial for meeting stringent regulatory requirements and accurately assessing DES performance.