1. Articles from Hiroyuki Kyono

    1-16 of 16
    1. Quantified frequency-domain optical coherence tomography analysis for the thin-high signals on restenotic tissue after paclitaxel-coated balloon angioplasty

      Quantified frequency-domain optical coherence tomography analysis for the thin-high signals on restenotic tissue after paclitaxel-coated balloon angioplasty

      Thin-high signals (THS), detectable by optical coherence tomography (OCT), represent the paclitaxel coverage of in-stent restenotic tissue. This study was conducted to assess the relationship between THS and angiographic outcomes by means of quantified post-procedural frequency-domain OCT (FD-OCT) analysis. From January 2014 to July 2016, 41 patients underwent FD-OCT-guided percutaneous coronary intervention using paclitaxel-coated balloon (PCB) to prevent in-stent restenosis. Of these, we retrospectively enrolled 32 patients (38 lesions) who underwent a 6- to 9-month follow-up angiogram. THS were assessed quantitatively, as THS length and lumen perimeter length were measured using semi-automated software; %THS was calculated by the following formula ...

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    2. The clinical characteristics and prognosis of lesions with in-stent eccentric tissue proliferation and strong signal attenuation detected by optical coherence tomography

      The clinical characteristics and prognosis of lesions with in-stent eccentric tissue proliferation and strong signal attenuation detected by optical coherence tomography

      There are still some patients who require repeat revascularization despite of drug-eluting stent (DES) implantation. The present study aimed to investigate the relationship between optical coherence tomography (OCT) findings and recurring target lesion revascularization (TLR) after percutaneous coronary intervention (PCI) for in-stent restenosis (ISR). We reviewed 50 patients (54 coronary lesions) who underwent PCI for ISR, which included 25 DES-ISR lesions. The PCI strategy depended on the interventionalist’s discretion, and DES implantation was performed for 38 (70 %) lesions. Tissue characteristics were assessed qualitatively and quantitatively using the frame showing maximal lumen narrowing (minimal lumen area). In qualitative analysis, OCT ...

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    3. Incidence and distribution of thin-high signals detected by coronary optical coherence tomography in patients treated with paclitaxel-coated balloon angioplasty for in-stent restenosis

      Incidence and distribution of thin-high signals detected by coronary optical coherence tomography in patients treated with paclitaxel-coated balloon angioplasty for in-stent restenosis

      Paclitaxel-coated balloon (PCB) angioplasty is one of the common treatments for patients with in-stent restenosis because its safety and efficacy has already been reported [1–3]. Meanwhile, optical coherence tomography (OCT) has great spatial resolution, which allows the observation of subtle changes in the coronary artery [4,5]. In a previous report, thin-high signals after PCB angioplasty were observed using OCT [6]. However, the incidence and distribution of thin-high signals have yet to be investigated.

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    4. Quantitative Optical Coherence Tomography Analysis for Late In-Stent Restenotic Lesions

      Quantitative Optical Coherence Tomography Analysis for Late In-Stent Restenotic Lesions

      Coronary optical coherence tomography (OCT) has the potential to identify in-stent neoatherosclerosis, which is a possible risk factor for late acute coronary events after drug-eluting stent implantation. The purpose of this study was to investigate differences between mid-term and late in-stent restenosis after stent implantation by quantitative and semiautomated tissue property analysis using OCT. In total, 1063 OCT image frames of 16 lesions in 15 patients were analyzed. This included 346 frames of 6 lesions in late in-stent restenosis, which was defined as restenosis that was not detected at 6 to 12 months but ≥ 12 months after follow-up coronary angiography ...

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    5. Predominant microvessel proliferation in coronary stent restenotic tissue in patients with diabetes: Insights from optical coherence tomography image analysis

      Predominant microvessel proliferation in coronary stent restenotic tissue in patients with diabetes: Insights from optical coherence tomography image analysis

      Background Coronary optical coherence tomography (OCT) enables virtual depiction of histological findings of in-stent restenotic tissue. The aim of this study was to investigate the microvessel proliferation within in-stent restenotic tissue and the influence of diabetes mellitus (DM). Methods We examined 54 in-stent restenotic coronary artery lesions (stenotic area > 50%) from 50 consecutive patients including 28 with DM (56%) and 9 insulin-treated DM patients (18%); who underwent coronary time-domain OCT imaging with automatic pull back (1 mm/s, 20 frames/s). Microvessels were defined as low-signal cavities with a diameter of 50–150 microns and a trajectory parallel to the ...

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    6. Consensus Standards for Acquisition, Measurement, and Reporting of Intravascular Optical Coherence Tomography Studies: A Report From the International Working Group for Intravascular Optical Coherence Tomography Standardization and Validation

      Consensus Standards for Acquisition, Measurement, and Reporting of Intravascular Optical Coherence Tomography Studies: A Report From the International Working Group for Intravascular Optical Coherence Tomography Standardization and Validation

      Objectives: The purpose of this document is to make the output of the International Working Group for Intravascular Optical Coherence Tomography (IWG-IVOCT) Standardization and Validation available to medical and scientific communities, through a peer-reviewed publication, in the interest of improving the diagnosis and treatment of patients with atherosclerosis, including coronary artery disease.Background: Intravascular optical coherence tomography (IVOCT) is a catheter-based modality that acquires images at a resolution of 10 μm, enabling visualization of blood vessel wall microstructure in vivo at an unprecedented level of detail. IVOCT devices are now commercially available worldwide, there is an active user base, and ...

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    7. The impact of an eccentric intravascular ImageWire during coronary optical coherence tomography imaging

      The impact of an eccentric intravascular ImageWire during coronary optical coherence tomography imaging
      Optical Coherence Tomography (OCT) provides high-resolution imaging which enables characterisation of atherosclerosis and vascular response to injury, but to ensure optimal analysis, one must realise potential sources of image distortion. We designed a series of analysesl, using coronary stents as a model, to investigate the influence of wire position on OCT-derived vascular images.
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    8. Assessment of coronary stent by optical coherence tomography, methodology and definitions

      Assessment of coronary stent by optical coherence tomography, methodology and definitions

      Optical coherence tomography has emerged as a powerful tool for stent assessment, and in a short time, has become the modality of choice for studying stent and vascular interactions in vivo. In this review, we discuss qualitative and quantitative parameters used for stent assessment by OCT. Various qualitative/quantitative variables of stent assessment are discussed in the perspective of the clinical and research values of each of them.

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    9. Semiautomatic segmentation and quantification of calcified plaques in intracoronary optical coherence tomography images

      Semiautomatic segmentation and quantification of calcified plaques in intracoronary optical coherence tomography images
      Coronary calcified plaque (CP) is both an important marker of atherosclerosis and major determinant of the success of coronary stenting. Intracoronary optical coherence tomography (OCT) with high spatial resolution can provide detailed volumetric characterization of CP. We present a semiautomatic method for segmentation and quantification of CP in OCT images. Following segmentation of the lumen, guide wire, and arterial wall, the CP was localized by edge detection and traced using a combined intensity and gradient-based level-set model. From the segmentation regions, quantification of the depth, area, angle fill fraction, and thickness of the CP was demonstrated. Validation by comparing the ...
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    10. Angiographic, IVUS and OCT evaluation of the long-term impact of coronary disease severity at the site of overlapping drug-eluting and bare metal stents: a substudy of the ODESSA trial

      Angiographic, IVUS and OCT evaluation of the long-term impact of coronary disease severity at the site of overlapping drug-eluting and bare metal stents: a substudy of the ODESSA trial
      Background A potentially adverse vascular response to overlapping drug eluting stents (DES) has been suggested in current research. Objective To evaluate the impact of baseline disease severity at the site of stent overlap. Methods and results This is a substudy of ODESSA, a prospective, randomised controlled trial designed to evaluate healing of overlapping stents. 71/77 patients with a total of 86 overlapping stents were studied: 25 sirolimus, 24 paclitaxel, 26 zotarolimus-eluting stents; and 11 bare metal stents (BMS). Patients were categorised into high-grade stenosis (HGS, ≥70% diameter stenosis) and low-grade stenosis (LGS, <70%) at the site of stent overlap ...
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    11. Strut Coverage and Vessel Wall Response to a New-Generation Paclitaxel-Eluting Stent With an Ultrathin Biodegradable Abluminal Polymer: Optical Coherence Tomography Drug-Eluting Stent Investigation (OCTDESI)

      Strut Coverage and Vessel Wall Response to a New-Generation Paclitaxel-Eluting Stent With an Ultrathin Biodegradable Abluminal Polymer: Optical Coherence Tomography Drug-Eluting Stent Investigation (OCTDESI)
      Background—Polymer-coated drug-eluting stents are effective in preventing restenosis but have been associated with delayed healing and incomplete strut coverage. It is unknown whether paclitaxel-eluting stents (PES) with minimal biodegradable abluminal coating enhances strut coverage while preventing neointimal hyperplasia. Using optical coherence tomography (OCT) as a primary imaging modality, we assessed the proportion of uncovered struts at 6-month follow-up in PES coated with durable versus ultrathin (<1 µ m) biodegradable abluminal polymers. Methods and Results—In this pilot trial, 60 patients with de novo lesions (25 mm) in native coronary vessels were randomly assigned to receive either TAXUS Liberté PES ...
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    12. Optical coherence tomography (OCT) strut-level analysis of drug-eluting stents (DES) in human coronary bifurcations

      Optical coherence tomography (OCT) strut-level analysis of drug-eluting stents (DES) in human coronary bifurcations
      Aims: We sought to evaluate the vascular response of stent struts deployed in bifurcation segments using optical coherence tomography (OCT). Conclusions: This study demonstrates a variable patter of strut coverage in the bifurcation among stent technologies, with a high percentage of PES floating struts remaining uncovered at 6-month follow-up.
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    13. Assessment of Heterogeneity of Strut-Level Neointima Hyperplasia After Stent Implantation by Optical Coherence Tomography

      Background: Optical coherence tomography (OCT) permits a highly accurate NIH assessment at each strut level within a cross-section. The aim of this study is to evaluate heterogeneity of NIH among different stents. Methods: Patients enrolled in ODESSA were assessed. ODESSA was a prospective randomized trial designed to evaluate strut coverage of overlapped (OLP) vs. non-OLP stent segments for the treatment of de-novo, native coronary artery stenosis with four different stent types: Sirolimus-eluting stent (SES); Paclitaxel-eluting stent (PES); Zotarolimus-eluting stent (ZES); and Liberte BMS (BMS). Distance between strut and lumen was measured in every 5 frames (0.3mm) along the stented ...
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    14. Unhealed Plaque Ruptures After Stenting in Acute Myocardial Infarction Assessed by Intracoronary Optical Coherence Tomography: Incidence, Predictors, and Clinical Implication

      Backgrounds: Non healing after stenting a ruptured thin capped fibroatheroma in acute myocardial infarction (AMI) has been suggested to be a possible cause of late stent thrombosis. Optical coherence tomography (OCT) provides detailed information of ruptured plaques and stent strut coverage. We used OCT to assess the incidence, predictors, and implications of residual plaque rupture after stenting in AMI. Methods: The HORIZONS-AMI trial was a prospective, multicenter, dual arm factorial trial in which pts with AMI were randomized to different antithrombotic regimens and paclitaxel-eluting TAXUS stents vs. bare metal EXPRESS stents (3:1). Clinical follow-up was performed at 12 months ...
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    1-16 of 16
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    Optical coherence tomography (OCT) strut-level analysis of drug-eluting stents (DES) in human coronary bifurcations Strut Coverage and Vessel Wall Response to a New-Generation Paclitaxel-Eluting Stent With an Ultrathin Biodegradable Abluminal Polymer: Optical Coherence Tomography Drug-Eluting Stent Investigation (OCTDESI) Angiographic, IVUS and OCT evaluation of the long-term impact of coronary disease severity at the site of overlapping drug-eluting and bare metal stents: a substudy of the ODESSA trial Semiautomatic segmentation and quantification of calcified plaques in intracoronary optical coherence tomography images Assessment of coronary stent by optical coherence tomography, methodology and definitions In vitro validation of new Fourier-domain optical coherence tomography The impact of an eccentric intravascular ImageWire during coronary optical coherence tomography imaging Consensus Standards for Acquisition, Measurement, and Reporting of Intravascular Optical Coherence Tomography Studies: A Report From the International Working Group for Intravascular Optical Coherence Tomography Standardization and Validation AI-Assisted In Situ Detection of Human Glioma Infiltration Using a Novel Computational Method for Optical Coherence Tomography Motorized capsule for shadow-free OCT imaging and synchronous beam control Notal Vision Diagnostic Clinic reports completion of 6 million ForeseeHome AMD home-monitoring tests Monitoring retinal responses to acute intraocular pressure elevation in rats with visible light optical coherence tomography