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Related Experiment Videos

Optical coherent reflectometry: a new technique to guide invasive procedures.

T Yamashita1, S Kasaoka, R Son

  • 1Division of Cardiology, Department of Medicine, University of California, Irvine, California 90095, USA.

Catheterization and Cardiovascular Interventions : Official Journal of the Society for Cardiac Angiography & Interventions
|October 9, 2001
PubMed
Summary

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Optical coherent reflectometry (OCR) guidewires can distinguish calcified plaque and artery boundaries, potentially improving chronic total occlusion treatment success rates.

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Research
  • Medical Imaging

Background:

  • Percutaneous transluminal coronary angioplasty (PTCA) for chronic total occlusions (CTO) has limited success.
  • Guidewire navigation failure is a primary cause of PTCA failure in CTO.
  • Novel guidance systems are needed to improve CTO intervention outcomes.

Purpose of the Study:

  • To evaluate a prototype Optical Coherent Reflectometry (OCR) guidewire for navigating chronic total arterial occlusions.
  • To determine if OCR can differentiate between various plaque compositions and tissue layers.
  • To assess the accuracy of OCR in determining guidewire position within occluded arteries.

Main Methods:

  • Developed a 0.014" hypotube guidewire incorporating an OCR fiber optic (1,300 nm wavelength).

Related Experiment Videos

  • Analyzed OCR reflectance slopes to differentiate human arterial plaque types (calcified, white, yellow) in vitro.
  • Compared OCR-based guidewire positioning with intravascular ultrasound (IVUS) in occluded human artery segments.

    • Main Results:

    • OCR demonstrated a significantly steeper reflectance slope for calcified plaques compared to non-calcified ones (P < 0.01).
    • OCR and IVUS showed 82% agreement in determining guidewire position within occluded arteries.
    • OCR achieved 79% sensitivity and 89% specificity in distinguishing plaque from the media/adventitia boundary (P < 0.001).

    Conclusions:

    • Optical Coherent Reflectometry can effectively differentiate calcified from non-calcified arterial plaque.
    • OCR shows promise in distinguishing plaque from deeper arterial wall layers.
    • This OCR guidewire technology may enhance safe navigation during interventions for chronic total occlusions.