Assessment of culprit and remote coronary narrowings using optical coherence tomography with long-term outcomes
ABSTRACT Much currently known information about vulnerable plaque stems from postmortem studies that identified several characteristics making them prone to rupture, including the presence of a thin fibrous cap and a large lipid core. This study used optical coherence tomography (OCT) to assess culprit and remote coronary narrowings and investigate whether intracoronary OCT in living patients was able to visualize morphologic features associated with vulnerable plaque in postmortem studies. Twenty-three patients successfully underwent OCT before percutaneous coronary intervention. The culprit lesion and mild to moderate coronary narrowings remote from the target stenosis were investigated. Using OCT, the culprit lesion was found to be fibrous in 39.1%, fibrocalcific in 34.4%, and lipid rich in 26.1% of cases. Two patients met criteria for thin-cap fibroatheroma (TCFA; defined as the presence of a signal-rich fibrous cap covering a signal-poor lipid/necrotic core with cap thickness <0.2 mm). Most plaques at remote segments were proximal to the culprit lesion (73.9%) and predominantly fibrous and lipid rich. OCT identified 7 TCFA lesions in 6 patients with a mean cap thickness of 0.19 +/- 0.05 mm, extending for 103 degrees +/- 49 degrees of the total vessel circumference. At 24 months of clinical follow-up, the only event occurred in a patient with in-stent restenosis who underwent repeated percutaneous revascularization. There were no clinically apparent plaque rupture-related events in the 6 patients found to have remote TCFA. This study showed that OCT can be safely applied to image beyond the culprit lesion and can detect in vivo morphologic features associated with plaque vulnerability using retrospective pathologic examination. In conclusion, detection of TCFA, particularly in stable patients, is desirable and may principally allow for early intervention and prevention of adverse events.
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- "A special entity of vulnerable plaques is the 'thin-cap fibroatheroma' (TCFA). The outstanding capacity of OCT to measure fibrous cap thickness makes it well-suited for the in vivo detection of TCFA . In one report, OCT allowed the diagnosis of TCFA with a sensitivity of 90%, and a specificity of 79%, as compared with histopathology . "
ABSTRACT: Optical coherence tomography is an exciting light-based imaging modality with a much higher axial resolution as compared with intravascular ultrasound. The diagnostic value of optical coherence tomography resides in its ability to provide information on the stent interaction with the vessel wall at the level of individual struts. Chief clinical implications include evaluating strut neointimal coverage and strut malapposition following coronary stenting. This Editorial covers the basics of optical coherence tomography, its established and potential clinical implications, probable caveats and downsides, in addition to a future perspective, all in view of the late-breaking peer-reviewed literature.International journal of cardiology 02/2012; 159(2):79-81. DOI:10.1016/j.ijcard.2012.01.070 · 6.18 Impact Factor
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- "It appears very likely that combined information on physiological, anatomical, chemical, and mechanical parameters    is needed for a reliable assessment of the proneness of a specific lesion to rupture. Some of these parameters may be accessible through intravascular imaging methods         . In addition, plaque type and morphology prior to intervention influence the long-term procedure outcome significantly . "
ABSTRACT: Optical Coherence Tomography (OCT) is rapidly becoming the method of choice for assessing arterial wall pathology in vivo. Atherosclerotic plaques can be diagnosed with high accuracy, including measurement of the thickness of fibrous caps, permitting an assessment of the risk of rupture. While the OCT image presents morphological information in highly resolved detail, it relies on interpretation of the images by trained readers for the identification of vessel wall components and tissue type. We developed a framework to aid the recognition of these atherosclerotic plaque constituents, based on the optical attenuation coefficient of the tissue. Based on a single-scattering model and using the point spread functions of individually characterized imaging catheters, several parameters need to be set in the analysis that may influence the results. Here, we present a simulation study used to optimize these parameters.Proceedings of SPIE - The International Society for Optical Engineering 01/2009; DOI:10.1117/12.807344 · 0.20 Impact Factor