1. Articles from kenichi fujii

    1-24 of 32 1 2 »
    1. The frequency and clinical characteristics of in-stent restenosis due to calcified nodule development after coronary stent implantation

      The frequency and clinical characteristics of in-stent restenosis due to calcified nodule development after coronary stent implantation

      The purpose of this study was to evaluated the clinical characteristics of calcified nodule-like in-stent restenosis (ISR) lesions using optical coherence tomography (OCT) in vivo. A total of 124 ISR lesions that were treated with a repeat coronary intervention under OCT guidance were included in this analysis. ISR neointimal morphology was classified as “calcified nodule-like ISR”, that appeared as a high-backscattering protruding mass with an irregular surface covered by signal-rich bands, or “non-calcified nodule-like ISR”. The maximum arc and thickness of calcium behind the stent struts was also measured. Of the 124 ISR lesions, calcified nodule-like ISR was observed in ...

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      Mentions: Kenichi Fujii
    2. Tangential Signal Dropout Mimicking the Appearance of Lipid-rich Plaques and Macrophage Infiltration on Optical Frequency Domain Imaging

      Tangential Signal Dropout Mimicking the Appearance of Lipid-rich Plaques and Macrophage Infiltration on Optical Frequency Domain Imaging

      Aims: This study evaluated the optical frequency domain imaging (OFDI) artifact of tangential signal dropout (TSD), which mimics the appearance of lipid-rich plaque and macrophage (Mø) infiltration. Methods and results: A total of 1,019 histological cross-sections from 23 autopsy hearts were matched with the corresponding OFDI images. Of those, 232 OFDI cross-sections that contained signal-poor regions with diffuse borders were classified as lipid-rich plaques. The angle θ was calculated between the OFDI beam that strikes the edge of the luminal surface of the low-intensity region and that which strikes the surface line of the low-intensity region. On histological evaluation, 182 ...

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      Mentions: Kenichi Fujii
    3. Short‐ and mid‐term influence of drug‐coated stent implantation on structural and functional vascular healing response: An optical coherence tomography and acetylcholine testing study

      Short‐ and mid‐term influence of drug‐coated stent implantation on structural and functional vascular healing response: An optical coherence tomography and acetylcholine testing study

      Objective This study investigated the effect of a drug‐coated stent (DCS) that has a novel microporous abluminal surface without a polymer on 1‐month and 1‐year functional and morphological healing response as assessed using acetylcholine (Ach) testing and optical coherence tomography (OCT). Background DCS is expected to induce favorable morphological and physiological arterial healing after its implantation. Methods A total of 11 patients who underwent vascular response examinations 1‐month and 1‐year after the index PCI with DCS implantation were enrolled. The vascular response was evaluated by the functional response test by acetylcholine infusion, the morphological response ...

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      Mentions: Kenichi Fujii
    4. Effect of neointimal tissue morphology on vascular response to balloon angioplasty in lesions with in-stent restenosis after drug-eluting stent deployment: an optical coherence tomography analysis

      Effect of neointimal tissue morphology on vascular response to balloon angioplasty in lesions with in-stent restenosis after drug-eluting stent deployment: an optical coherence tomography analysis

      This study aimed to evaluate the vascular response to balloon angioplasty for drug-eluting stent (DES) in-stent restenosis (ISR) lesions based on our novel optical coherence tomography (OCT) classification to establish the optimal treatment strategy for ISR lesions after DES implantation. A total of 104 ISR lesions after DES implantation were imaged by OCT and categorized into the following six patterns: type I—homogeneous high-intensity tissue, type II—heterogeneous tissue with signal attenuation, type III—speckled heterogeneous tissue, type IV—mixed tissue containing poorly delineated region with invisible strut, type V—mixed tissue containing sharply delineated low-intensity region, and type VI ...

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      Mentions: Kenichi Fujii
    5. Impact of optical coherence tomography‐derived neointimal tissue morphology on development of very late in‐stent restenosis

      Impact of optical coherence tomography‐derived neointimal tissue morphology on development of very late in‐stent restenosis

      Objectives This study evaluated the progression of very late in‐stent restenosis (VL‐ISR) by analyzing four serial coronary angiography (CAG) images and its correlation with neointimal tissue characterization of the VL‐ISR lesions on optical coherence tomography (OCT). Background Recently, VL‐ISR is occasionally observed beyond a few years after drug‐eluting stents (DESs) implantation. Methods This study analyzed 50 VL‐ISR lesions after DES in which 4 serial CAGs over a period of 2 years, including at baseline procedure, 9 months after baseline procedure, 12 months before VL‐ISR, and at the time of VL‐ISR, were performed ...

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      Mentions: Kenichi Fujii
    6. Expert consensus statement for quantitative measurement and morphological assessment of optical coherence tomography

      Expert consensus statement for quantitative measurement and morphological assessment of optical coherence tomography

      In this document, the methods for the quantitative measurement and morphological assessment of optical coherence tomography (OCT)/optical frequency domain imaging images (OFDI) are briefly summarized. The focus is on the clinical application of OCT/OFDI to guide percutaneous coronary interventions.

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    7. Assessment of strut coverage of everolimus-eluting platinum chromium stent 2 weeks after implantation by optical coherence tomography

      Assessment of strut coverage of everolimus-eluting platinum chromium stent 2 weeks after implantation by optical coherence tomography

      The SYNERGY coronary stent is new-generation drug-eluting stents, which has a thin-strut platinum–chromium platform with everolimus in a biodegradable polymer applied to the abluminal surface. It would be speculated that favorable arterial healing with early strut coverage could be achieved. The present study investigated the degree of strut coverage using optical coherence tomography (OCT) 2 weeks after SYNERGY implantation and clinical factors contributing to strut coverage. A total of 29 patients who underwent staged percutaneous coronary intervention (PCI) to residual lesions 2 weeks after the index PCI with SYNERGY stent implantation were enrolled. At the time of staged PCI ...

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      Mentions: Kenichi Fujii
    8. Microbubble contrast enhancement of neointima after drug-eluting stent implantation: an optical coherence tomography study

      Microbubble contrast enhancement of neointima after drug-eluting stent implantation: an optical coherence tomography study

      Microvessels within neoatherosclerosis are associated with vulnerability and increase from the early to the very late phase after drug-eluting stent implantation. Microbubble contrast agents have been suggested to enhance tissue microvasculature for optical coherence tomography (OCT) imaging. The present study investigated whether OCT signal intensity of neointima within stented segments was enhanced after intracoronary administration of microbubble contrast agents. A total of 40 patients who underwent follow-up coronary angiography after drug-eluting stent implantation were enrolled. At the time of follow-up coronary angiography, OCT images of the stented segments were recorded before and after intracoronary administration of microbubble contrast agents. Mean ...

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      Mentions: Kenichi Fujii
    9. Impact of low tissue backscattering by optical coherence tomography on endothelial function after drug-eluting stent implantation

      Impact of low tissue backscattering by optical coherence tomography on endothelial function after drug-eluting stent implantation

      This study evaluated the impact of optical coherence tomography (OCT)-derived low-backscattered tissue on mid-term coronary endothelial function after drug-eluting stent (DES) implantation. Although OCT enables detailed in vivo evaluation of neointimal tissue characterization after DES implantation, its association with physiological vascular healing response is unclear. Thirty-three stable angina pectoris patients underwent OCT examination and endothelial function testing with intracoronary infusion of incremental doses of acetylcholine 8-month after DES implantation in a single lesion of the left anterior descending artery. Neointimal tissue was classified into two patterns based on the predominant OCT light backscatter: high backscatter and low backscatter. Although ...

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      Mentions: Kenichi Fujii
    10. Histopathological validation of optical coherence tomography findings of the coronary arteries

      Histopathological validation of optical coherence tomography findings of the coronary arteries

      Optical coherence tomography (OCT), a catheter-based imaging modality for the visualization of coronary arteries, is widely used during percutaneous coronary intervention to improve the understanding of the anatomy of coronary artery stenosis and to elucidate the mechanisms of atherosclerosis. In this review, we provide a short description of the histopathological validations of OCT for visualizing atherosclerotic plaques and vascular healing response after drug-eluting stent (DES) implantation. Because OCT measures the intensity of light returning from within a tissue, tissue having a higher heterogeneity of optical index of refraction, such as microcalcification deposition and foam cell accumulation on the luminal surface ...

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      Mentions: Kenichi Fujii
    11. ORGANIZATION OF THROMBUS CONTRIBUTES TO RAPID PROGRESSION OF CORONARY ARTERY DISEASE: A SERIAL CORONARY ANGIOGRAMS AND OPTICAL COHERENCE TOMOGRAPHY STUDY

      ORGANIZATION OF THROMBUS CONTRIBUTES TO RAPID PROGRESSION OF CORONARY ARTERY DISEASE: A SERIAL CORONARY ANGIOGRAMS AND OPTICAL COHERENCE TOMOGRAPHY STUDY

      Background The process of progression of coronary artery disease (CAD) is generally classified as either rapid progression or continuous slight progression in daily clinical practice. However, the precise mechanism of rapid progression in CAD is unknown. Methods This study consists of 62 lesions with clinically significant progression of CAD (>10%/year) in which serial coronary angiogram and optical coherence tomography (OCT) were performed at intervals of approximately 1 year. From the angiographic progression pattern, 20 lesions (32%) were categorized as rapid progression (≥50%) and 42 lesions (68%) as slight progression. Plaque morphology was classified on the basis of OCT findings ...

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      Mentions: Kenichi Fujii
    12. Comparing the vascular response in implantation of self-expanding, bare metal nitinol stents or paclitaxel-eluting nitinol stents in superficial femoral artery lesions: a serial optical frequency domain imaging study

      Comparing the vascular response in implantation of self-expanding, bare metal nitinol stents or paclitaxel-eluting nitinol stents in superficial femoral artery lesions: a serial optical frequency domain imaging study

      Aims: This study sought to investigate differences in vascular response between self-expanding bare metal nitinol stents (BMS) and paclitaxel-eluting nitinol stents (PES), in superficial femoral artery (SFA) disease, using optical frequency domain imaging (OFDI). Methods and results: Six months after stent implantation, follow-up quantitative vascular angiography (QVA) and OFDI assessment were scheduled to evaluate vascular response. Volume index (VI) was defined as volume divided by stent length. The primary endpoint was OFDI-derived late lumen area loss, defined as lumen VI post stent implantation minus lumen VI at follow-up. A total of 28 SFA lesions were analysed, with cases randomised to ...

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    13. Ex Vivo Assessment of Neointimal Characteristics After Drug-eluting Stent Implantation: Optical Coherence Tomography and Histopathology Validation Study

      Ex Vivo Assessment of Neointimal Characteristics After Drug-eluting Stent Implantation: Optical Coherence Tomography and Histopathology Validation Study

      Background Optical coherence tomography (OCT) is one of the tools trying to distinguish neoatherosclerosis from other neointimal tissue but its role has to be still validated. This study evaluated the diagnostic accuracy of OCT for characterization of lipid-atherosclerotic neointima following drug-eluting stent (DES) implantation. Methods Twelve stented coronary arteries from the 7 autopsy hearts were imaged by OCT. These OCT images were compared with histology. By OCT, the morphological appearances of neointima were classified into three patterns: homogeneous pattern, heterogeneous pattern with visible strut, or heterogeneous pattern with invisible strut. Results Of 21 histological cross-sections, 6 were categorized as homogeneous ...

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    14. Impact of final kissing balloon inflation on vessel healing following drug-eluting stent implantation: Insight from the optical coherence tomography sub-study of the J-REVERSE trial

      Impact of final kissing balloon inflation on vessel healing following drug-eluting stent implantation: Insight from the optical coherence tomography sub-study of the J-REVERSE trial

      Background We sought to clarify the impact of final kissing inflation (FKI) after single stenting of bifurcation lesions on vessel healing. Methods From the J-REVERSE registry enrolling 303 bifurcation lesions treated with provisional single stenting using sirolimus- (SES) or everolimus-eluting stent (EES), 65 lesions treated with ( n = 30) and without ( n = 35) FKI underwent 9-month follow-up optical coherence tomography. Average stent eccentricity index (SEI: minimum/maximum stent diameter) and neointimal unevenness score (NUS: maximum/average neointimal thickness of the same cross-section) for the proximal, bifurcation, and distal segments were compared between FKI and non-FKI groups. Results At the proximal segment ...

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    15. Differences in Vessel Healing Between Sirolimus- and Everolimus-Eluting Stent Implantation for Bifurcation Lesions: The J-REVERSE Optical Coherence Tomography Substudy

      Differences in Vessel Healing Between Sirolimus- and Everolimus-Eluting Stent Implantation for Bifurcation Lesions: The J-REVERSE Optical Coherence Tomography Substudy

      Background We aimed to clarify the differences in vessel healing after stenting of bifurcation lesions using sirolimus-eluting stents (SESs) or everolimus-eluting stents (EESs). Methods J apanese R egistry Study in Comparison Between Ever olimus-Eluting Stent and S irolimus- E luting Stent for the Bifurcation Lesion (J-REVERSE) is a prospective multicentre registry of 303 bifurcation lesions that were treated with provisional SES or EES with or without final kissing inflation. The first 115 lesions at selected study sites were predefined for inclusion in the optical coherence tomography (OCT) substudy, and 9-month follow-up OCT was conducted in 64 lesions (SES, n = 18 ...

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    16. Tissue Characterization of In-Stent Neointima Using Optical Coherence Tomography in the Late Phase After Bare-Metal Stent Implantation – An Ex Vivo Validation Study –

      Tissue Characterization of In-Stent Neointima Using Optical Coherence Tomography in the Late Phase After Bare-Metal Stent Implantation – An Ex Vivo Validation Study –

      Background: We performed an ex vivo study to investigate optical coherence tomography (OCT) imaging for differentiating several types of neointimal tissue during the later phases after bare-metal stent (BMS) implantation as compared with histologic results. Methods and Results: OCT imaging was performed in 6 autopsy hearts for 10 BMS with implant duration >4 years. OCT qualitative neointimal tissue characterization was based on tissue structure and classified as homogeneous pattern, heterogeneous pattern with visible struts, or heterogeneous pattern with invisible struts. Corresponding histological analyses of each 2-mm cross-section of the entire BMS were performed. Of 81 cross-sections, histological analysis revealed that ...

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      Mentions: Abbot Kenichi Fujii
    17. Differences in Vessel Healing between Sirolimus- and Everolimus-eluting Stent Implantation for Bifurcation Lesions: The J-REVERSE OCT Sub-study

      Differences in Vessel Healing between Sirolimus- and Everolimus-eluting Stent Implantation for Bifurcation Lesions: The J-REVERSE OCT Sub-study

      Background We aimed to clarify the differences in vessel healing after stenting for bifurcation lesions using sirolimus-eluting stent (SES) or everolimus-eluting stent (EES). Methods J-REVERSE is a prospective multicenter registry of 303 bifurcation lesions that were treated with provisional SES or EES with or without final kissing inflation. The first 115 lesions at selected study sites were predefined for inclusion in the optical coherence tomography (OCT) sub-study and 9-month follow-up OCT was conducted in 64 lesions (SES: n = 18, EES: n = 46). In addition to standard OCT parameters, stent eccentricity index (SEI; minimum divided by the maximum stent diameter), neointimal ...

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    18. Restenosis After Drug-Eluting Stent Implantation in a Patient With Polycythemia Vera Optical Coherence Tomography and Pathological Findings

      Restenosis After Drug-Eluting Stent Implantation in a Patient With Polycythemia Vera Optical Coherence Tomography and Pathological Findings

      An 83-year-old woman was referred to our hospital due to diverticular bleeding of the colon. She had a history of everolimus-eluting stent implantation in the left anterior descending artery (31 months before) and the right coronary artery (20 and 31 months before) because of stable angina. She was prescribed aspirin 100 mg/day and clopidogrel 75 mg/day, followed by single antiplatelet therapy by aspirin during the last 8 months. Aspirin was discontinued for the endoscopic therapy at her admission. Complete blood count showed hemoglobin of 17.5 g/dl and hematocrit of 55.2%, from which polycythemia vera (PV ...

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      Mentions: Abbot Kenichi Fujii
    19. Accuracy of OCT, Grayscale IVUS, and Their Combination for the Diagnosis of Coronary TCFA An Ex Vivo Validation Study

      Accuracy of OCT, Grayscale IVUS, and Their Combination for the Diagnosis of Coronary TCFA An Ex Vivo Validation Study

      Objectives This study sought to assess the accuracy of optical coherence tomography (OCT), gray-scale intravascular ultrasound (IVUS), and their combination for detecting thin-cap fibroatheromas (TCFA). Background The extent to which the imaging characteristics of OCT and IVUS correlate with histologically defined TCFA is unknown. Methods IVUS and OCT examinations identified focal plaques in 165 coronary arteries from 60 autopsy hearts. A total of 685 pairs of images of OCT and IVUS were compared with histology. By OCT, a TCFA was defined as a signal-poor region with diffuse borders and cap thickness <65 μm. By IVUS, a TCFA was defined by ...

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    20. Different Findings in a Calcified Nodule Between Histology and Intravascular Imaging Such as Intravascular Ultrasound, Optical Coherence Tomography, and Coronary Angioscopy

      Different Findings in a Calcified Nodule Between Histology and Intravascular Imaging Such as Intravascular Ultrasound, Optical Coherence Tomography, and Coronary Angioscopy

      An 89-year-old woman who suffered a stroke and congestive heart failure was admitted to our hospital. She died of heart failure and autopsy was performed. Coronary arteries were removed from the heart and used for ex vivo imaging of intravascular ultrasound ([IVUS]; Atlantis, Boston Scientific Corporation, Natick, Massachusetts), optical coherence tomography (LightLab imaging Inc., Westford, Massachusetts), and coronary angioscopy (FiberTech, Tokyo, Japan) within 6 h after death before fixation with 10% buffered formalin. IVUS illustrated a convex lesion with superficial hyperechoic signal accompanied by acoustic shadowing at the left anterior descending artery (Figure 1 , arrows). Optical coherence tomography demonstrated an ...

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    21. Can Optical Coherence Tomography Findings Be Used as Surrogates for Vessel Healing After Drug-Eluting Stent Implantation?

      Can Optical Coherence Tomography Findings Be Used as Surrogates for Vessel Healing After Drug-Eluting Stent Implantation?

      Drug-eluting stents (DES) inhibit neointimal proliferation and reduce the rates of subsequent target lesion revascularization as compared with bare-metal stents in randomized clinical trials.1,2 However, too much inhibition of neointimal hyperplasia might cause delayed vascular healing with incomplete endothelialization, which has been associated with an increase risk of stent thrombosis.3,4 Therefore, accurate assessment of the neointimal coverage in DES may be critical in prognosticating their safety. Optical coherence tomography (OCT) uses near-infrared light and generate crosssectional images by measuring the echo time delay and intensity of light that is reflected or back-scattered from the tissue. The ...

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      Mentions: Kenichi Fujii
    22. Natural history of low-intensity neointimal tissue after an everolimus-eluting stent implantation: a serial observation with optical coherence tomography

      Natural history of low-intensity neointimal tissue after an everolimus-eluting stent implantation: a serial observation with optical coherence tomography

      Although previous optical coherence tomography (OCT) studies reported that restenosis tissue after implantation of a drug-eluting stent (DES) was composed of a variety of cells, the clinical significance of morphologic characteristics for in-stent neointimal tissue as assessed by OCT has not been clarified. We experienced a patient with stable angina who underwent percutaneous coronary intervention with a 2.5 × 18-mm DES implantation 6 months before the OCT examination. OCT imaging showed a mild intimal hyperplasia (39 % neointimal hyperplasia) with eccentric, heterogeneous tissue, predominantly of low signal intensity. Seventeen months after the initial procedure, OCT revealed a significant increase in percent ...

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    23. Intracoronary Imaging for Detecting Vulnerable Plaque

      Intracoronary Imaging for Detecting Vulnerable Plaque

      It is now generally recognized that acute coronary syndromes most commonly result from disruption of thin-cap fibroatheroma (TCFA), which is characterized by a large necrotic core with an overlying thin-fibrous cap measuring <65μm. Recent advances in intracoronary imaging modalities have significantly improved the ability to detect TCFA in vivo. Intravascular ultrasound (IVUS) is perhaps the most promising modality that has been used more than 15 years to evaluate atherosclerotic plaque. IVUS has revealed a lot of the clinical evidence regarding vulnerable plaque detection in live humans. Recently, by analyzing the IVUS acoustic signal before demodulation and scan conversion, IVUS ...

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    1-24 of 32 1 2 »
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    1. (30 articles) Kenichi Fujii
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    Frequency and Predictor of Coronary Thin-Cap Fibroatheroma in Patients With Acute Myocardial Infarction and Stable Angina Pectoris: A 3-Vessel Optical Coherence Tomography Study OCT Assessment of Thin-Cap Fibroatheroma Distribution in Native Coronary Arteries Endothelium-dependent coronary vasomotor response and neointimal coverage of zotarolimus-eluting stents 3 months after implantation Multiple complex coronary atherosclerosis in diabetic patients with acute myocardial infarction: a three-vessel optical coherence tomography study Intracoronary Imaging for Detecting Vulnerable Plaque Different Findings in a Calcified Nodule Between Histology and Intravascular Imaging Such as Intravascular Ultrasound, Optical Coherence Tomography, and Coronary Angioscopy Clinical Usefulness of a Novel Optical Coherence Tomography Procedure, “Low Molecular Weight Dextran Infusion Followed by Catheter PUSH (D-PUSH)” Optical Coherence Tomography to Guide Percutaneous Coronary Intervention of the Left Main Coronary Artery: the LEMON study Impact of optical coherence tomography findings on clinical outcomes in ST-segment elevation myocardial infarction patients: a MATRIX (Minimizing Adverse Hemorrhagic Events by Trans-radial Access Site and angioX) OCT sub-study OCTA Multilayer and Multisector Peripapillary Microvascular Modeling for Diagnosing and Staging of Glaucoma Optical coherence tomography angiography for identifying choroidal neovascular membranes: a masked study in clinical practice Preclinical ocular features in patients with Behçet’s disease detected by optical coherence tomography angiography