1. Articles from Osamu Katoh

    1-14 of 14
    1. Recanalization system using radiofrequency energy

      Recanalization system using radiofrequency energy

      A method and systems for treating chronic total occlusions, particularly those that are difficult to treat, is disclosed. In this approach, recanalizing the CTO is achieved using a combined antegrade and retrograde approach. The proximal end of the occlusion is penetrated using an antegrade wire, using a traditional approach. Using collateral vessels, the distal end of the occlusion is crossed in a retrograde fashion. By appropriately maneuvering each member and applying radiofrequency energy between the proximal and distal ends of the occlusion, a continuous channel is created.

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      Mentions: Osamu Katoh
    2. Impact of Cholesterol Metabolism on Coronary Plaque Vulnerability of Target Vessels : A Combined Analysis of Virtual Histology Intravascular Ultrasound and Optical Coherence Tomography

      Impact of Cholesterol Metabolism on Coronary Plaque Vulnerability of Target Vessels : A Combined Analysis of Virtual Histology Intravascular Ultrasound and Optical Coherence Tomography

      Objectives The aim of this study was to evaluate the relationship between cholesterol metabolism and coronary plaque vulnerability. Background Cholesterol homeostasis, defined as the balance between absorption and synthesis, influences the progression of coronary atherosclerosis. Methods Consecutive stable angina pectoris patients (N = 80) not receiving any lipid-lowering therapy were divided into 2 groups based on the presence of in vivo thin cap fibroatheroma (TCFA) in de novo target vessels assessed by the combined use of virtual histology intravascular ultrasound and optical coherence tomography. Results Patients with in vivo TCFA (n = 42) showed a higher campesterol-to-lathosterol ratio (3.36 [interquartile range ...

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    3. Response to Letter Regarding Article, "Impact of Frequency-Domain Optical Coherence Tomography Guidance for Optimal Coronary Stent Implantation in Comparison With Intravascular Ultrasound Guidance"

      Response to Letter Regarding Article, "Impact of Frequency-Domain Optical Coherence Tomography Guidance for Optimal Coronary Stent Implantation in Comparison With Intravascular Ultrasound Guidance"

      We appreciate the valuable comments by Garcia-Garcia et al regarding our article.1 We agree with the comments on our limitations about study design especially with regard to criteria of the procedure. First, the efficacy of distal protection devices in native coronary arteries is still controversial, and criteria regarding usage of this device are not defined yet. However, we believe this device could be helpful for prevention of distal embolus in certain cases as we have sometimes experienced, and optical frequency-domain imaging (OFDI) is helpful to predict such cases. Making use of the criteria of this study, distal protection was ...

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    4. Impact of Frequency-Domain Optical Coherence Tomography Guidance for Optimal Coronary Stent Implantation in Comparison With Intravascular Ultrasound Guidance

      Impact of Frequency-Domain Optical Coherence Tomography Guidance for Optimal Coronary Stent Implantation in Comparison With Intravascular Ultrasound Guidance

      Background—Frequency-domain optical coherence tomography (FD-OCT) is a novel, high resolution intravascular imaging modality. Intravascular ultrasound (IVUS) is a widely used conventional imaging modality for achieving optimal stent deployment. The aim of this study was to evaluate the impact of FD-OCT guidance for coronary stent implantation compared with IVUS guidance. Methods and Results—A total of 70 patients with de novo coronary artery lesions and either unstable or stable angina pectoris were enrolled in this randomized study (optical coherence tomography [OCT] group: n=35, IVUS group: n=35). In the OCT group, stent implantation was performed under FD-OCT guidance alone ...

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    5. Association of coronary plaque composition and arterial remodelling: A optical coherence tomography study - Corrected Proof

      Association of coronary plaque composition and arterial remodelling: A optical coherence tomography study - Corrected Proof

      Background Conflicting data have been reported about the association between plaque composition and remodelling index (RI). The aim of this study is to evaluate the relationship between plaque morphology obtained by optical coherence tomography (OCT) and arterial remodelling. Methods and results OCT and intravascular ultrasound imaging pull back was performed at corresponding sites on 94 lesions in 47 patients. OCT plaque characteristics for lipid content, fibrous cap thickness, thin-cap fibroatheroma (TCFA), plaque rupture, thrombus, calcification and erosion were derived using validated criteria. Compared with intermediate/negative remodelling (RI<1.0), positive remodelling (RI>1.0) was associated with presence of higher lipid pool (2.86 ...

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    6. Difference of Tissue Characteristics Between Early and Very Late Restenosis Lesions After Bare-Metal Stent Implantation: An Optical Coherence Tomography Study

      Difference of Tissue Characteristics Between Early and Very Late Restenosis Lesions After Bare-Metal Stent Implantation: An Optical Coherence Tomography Study
      Background—Although in-stent restenosis (ISR) after bare-metal stent (BMS) implantation peaks in the early phase, very late (VL) ISR occasionally is observed beyond a few years after BMS implantation. To date, this mechanism has not been fully clarified. Methods and Results—We compared the morphological characteristics of VL-ISR (>5 years, without restenosis within the first year) (n=43) to those of early (E) ISR (within the first year) (n=39) using optical coherence tomography (OCT). Qualitative restenotic tissue analysis included assessment of tissue structure (homogeneous or heterogeneous), presence of microvessels, disrupted intima with cavity, and intraluminal material and was performed ...
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    7. Comparison of In Vivo Assessment of Vulnerable Plaque by 64-Slice Multislice Computed Tomography Versus Optical Coherence Tomography

      Comparison of In Vivo Assessment of Vulnerable Plaque by 64-Slice Multislice Computed Tomography Versus Optical Coherence Tomography
      The aim of this study was to investigate the possibility of 64-slice multislice computed tomography (MSCT) to detect vulnerable plaque derived by optical coherence tomography. From September 2007 through December 2009, 122 lesions in 81 patients were evaluated by 64-slice MSCT and optical coherence tomography. Based on optical coherence tomographic findings, lesions were classified as thin-capped fibroatheroma (TCFA; n = 37) and non-TCFA (n = 85). Mean computed tomographic density value of the lesion was lower and remodeling index was larger in the TCFA group (44.9 ± 19.2 vs 78.7 ± 25.0 HU, p
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    8. In-vivo detection of the frequency and distribution of thin-cap fibroatheroma and ruptured plaques in patients with coronary artery disease: an optical coherence tomographic study

      In-vivo detection of the frequency and distribution of thin-cap fibroatheroma and ruptured plaques in patients with coronary artery disease: an optical coherence tomographic study
      Objectives: The purpose of this study was to assess the prevalence and to quantify the thin-cap fibroatheroma (TCFA) and ruptured plaques in patients with coronary artery disease using optical coherence tomography (OCT). Background: TCFA lesions are the most prevalent precursors of plaque rupture, and are responsible for acute coronary syndromes (ACS). There are limited data regarding the frequency and distribution of TCFA in diseased coronary arteries. Methods: Coronary artery OCT was performed in 78 vessels in 47 patients, with stable angina (SA) or ACS. OCT plaque characteristics were derived using criteria that had been validated earlier. TCFA was defined as ...
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    9. Different Patterns of Vascular Response Between Patients With or Without Diabetes Mellitus After Drug-Eluting Stent Implantation: Optical Coherence Tomographic Analysis

      Different Patterns of Vascular Response Between Patients With or Without Diabetes Mellitus After Drug-Eluting Stent Implantation: Optical Coherence Tomographic Analysis
      Objectives We performed this study to investigate with optical coherence tomography (OCT) the vascular response after sirolimus-eluting stent (SES) implantation between patients with and those without diabetes mellitus (DM). Background The difference in vascular response after SES implantation between patients with and those without DM has not been fully evaluated with OCT. Methods Optical coherence tomography was performed to examine 74 nonrestenotic SES implanted in 63 patients (32 with DM and 31 without DM) at 9 months after SES implantation. For struts showing neointimal coverage, the neointimal thickness on the luminal side of each strut section was measured, and neointimal ...
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    10. Comparative Analysis of Vascular Responses Following Stent Implantation in the Lesion Wth Acute Coronary Syndrome Between Paclitaxel-Eluting and Bare-Metal Stent Using Optical Coherence Tomography

      Background: Safety and feasibility of drug-eluting stent in the lesion with acute coronary syndrome (ACS) is still controversial. Optical coherence tomography (OCT) is a high-resolution intravascular imaging modality, which is expected to visualize microscopic vascular response to coronary intervention. The purpose of this study is to evaluate the difference of vascular responses following stent implantation in the ACS lesions between paclitaxel-eluting stent (PES) and bare-metal stent (BMS) using OCT. Method: Fifty-eight ACS patients who were treated with either PES or BMS (33PESs and 25 BMSs) underwent OCT at 3 months follow-up, and 38 of them (20PESs and 18BMSs) also had ...
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    11. Comparison of Subsequent Vascular Response in Diabetic Patients Following Coronary Stenting Between Sirolimus- and Paclitaxel-Eluting Stents: Optical Coherence Tomography Analysis

      Comparison of Subsequent Vascular Response in Diabetic Patients Following Coronary Stenting Between Sirolimus- and Paclitaxel-Eluting Stents: Optical Coherence Tomography Analysis
      Background: Diabetes mellitus is one of the major predictors for target lesion revascularization even in drug-eluting stent era. The aim of this study is to evaluate the differences of chronic vascular response in patients with diabetes mellitus (DM) following coronary stenting between sirolimus-eluting stent (SES) and paclitaxel-eluting stent (PES) using optical coherence tomography (OCT). Methods: We examined non-restenotic 60 SESs and 60 PESs were imaged with motorized OCT pull-back system (1 mm/s) at 9-month follow-up and analyzed at interval of 1 mm. Neointimal coverage of stent struts and the incidence of stent malapposition were evaluated. Results: See table. Conclusions ...
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    12. Accuracy and Reproducibility of Stent-Strut Thickness Determined by Optical Coherence Tomography

      Accuracy and Reproducibility of Stent-Strut Thickness Determined by Optical Coherence Tomography
      Background. Optical coherence tomography (OCT) has been increasingly used to evaluate stent apposition following implantation. Since stent struts are visualized as linear structures with strong surface reflection and typical dorsal shadowing, apposition of struts is evaluated by measuring the distance between the strut surface reflection and adjacent vessel surface in consideration of strut thickness. However, there are no data available to validate the measurements of strut thickness by OCT. The aim of this in vitro study is to validate the accuracy of OCT measurement of stent-strut thickness of different commercially available stents in evaluating stent apposition. Methods. We performed the ...
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    13. Difference in Neointimal Growth on the Stent Struts Crossing a Side Branch Between Sirolimus-Eluting Stent and Bare-Metal Stent: An Optical Coherence Tomography Analysis

      Difference in Neointimal Growth on the Stent Struts Crossing a Side Branch Between Sirolimus-Eluting Stent and Bare-Metal Stent: An Optical Coherence Tomography Analysis
      Background: A bifurcation lesion has been demonstrated to be the high risk lesion for late stent thrombosis (LST) following drug-eluting stent implantation, resulting from disturbed laminar blood flow and delayed endothelialization of unapposed stent struts. We examined differences in neointimal growth on the stent struts crossing a side branch between sirolimus-eluting stent (SES) and bare-metal stent (BMS) using optical coherence tomography (OCT).. Methods and Results: Of the 41 stents (34 cases) implanted across side branches, 70 struts of 28 SES and 23 struts of 13 BMS, which crossed over a side branch, were analyzed 9 months after stent implantation using ...
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    1-14 of 14
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    1. (13 articles) Toyohashi Heart Center
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    3. (13 articles) Osamu Katoh
    4. (13 articles) Takahiko Suzuki
    5. (11 articles) Etsuo Tsuchikane
    6. (10 articles) Masashi Kimura
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    Difference in Neointimal Growth on the Stent Struts Crossing a Side Branch Between Sirolimus-Eluting Stent and Bare-Metal Stent: An Optical Coherence Tomography Analysis Accuracy and Reproducibility of Stent-Strut Thickness Determined by Optical Coherence Tomography Comparison of Subsequent Vascular Response in Diabetic Patients Following Coronary Stenting Between Sirolimus- and Paclitaxel-Eluting Stents: Optical Coherence Tomography Analysis Different Patterns of Vascular Response Between Patients With or Without Diabetes Mellitus After Drug-Eluting Stent Implantation: Optical Coherence Tomographic Analysis In-vivo detection of the frequency and distribution of thin-cap fibroatheroma and ruptured plaques in patients with coronary artery disease: an optical coherence tomographic study Comparison of In Vivo Assessment of Vulnerable Plaque by 64-Slice Multislice Computed Tomography Versus Optical Coherence Tomography Difference of Tissue Characteristics Between Early and Very Late Restenosis Lesions After Bare-Metal Stent Implantation: An Optical Coherence Tomography Study Association of coronary plaque composition and arterial remodelling: A optical coherence tomography study - Corrected Proof Development of a Free Space, LED Illuminated Spectral-domain Optical Coherence Tomography Setup Design and Implementation of Full Field-Optical Coherence Tomography on an Olympus IX73 Microscope (Thesis) Retinal Changes in Different Grades of Retinal Artery Occlusion: An Optical Coherence Tomography Study Optical Coherence Tomography Angiography in the Evaluation of Geographic Atrophy Area Extension