1. Articles from takahiro sawada

    1-16 of 16
    1. Early and mid-term vascular responses to optical coherence tomography guided everolimus-eluting stent implantation in stable coronary artery disease

      Early and mid-term vascular responses to optical coherence tomography guided everolimus-eluting stent implantation in stable coronary artery disease

      Background Analysis of pooled clinical data has shown the safety of 3 months of dual antiplatelet therapy (DAPT) with everolimus-eluting cobalt–chromium stents (Co-Cr EESs). This study evaluated early and mid-term vascular responses to Co-Cr EESs in patients with stable coronary artery disease (CAD). Methods The MECHANISM-Elective trial (NCT02014818) is a multicenter optical coherence tomography (OCT) registry. Enrolled patients were evaluated by OCT immediately after EES implantation (post), were prospectively allocated to either 1 month (n = 50) or 3 months (n = 50) OCT follow-up, and then received a 12 months OCT evaluation. The incidences of intrastent thrombus (IS-Th) and irregular ...

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    2. Comparisons of detailed arterial healing response at seven months following implantation of an everolimus- or sirolimus-eluting stent in patients with ST-segment elevation myocardial infarction

      Comparisons of detailed arterial healing response at seven months following implantation of an everolimus- or sirolimus-eluting stent in patients with ST-segment elevation myocardial infarction

      Background The difference of arterial healing response following everolimus-eluting stent (EES) or sirolimus-eluting stent (SES) implantation in patients with ST-segment elevated myocardial infarction (STEMI) has not been compared in detail. Methods Thirty-five patients with STEMI were randomly implanted with an EES or SES (23 EES, 12 SES). At seven months, neointimal thickness (NIT) and strut malapposition were evaluated by optical coherence tomography (OCT) and the grade and heterogeneity of neointimal coverage (NIC) and development of intra-stent thrombi were evaluated by angioscopy. Results No significant differences were noted in clinical events experienced by the two groups, although one patient with an ...

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    3. Effect of Cytochrome P450 2C19 Polymorphism on Target Lesion Outcome After Drug-Eluting Stent Implantation in Japanese Patients Receiving Clopidogrel

      Effect of Cytochrome P450 2C19 Polymorphism on Target Lesion Outcome After Drug-Eluting Stent Implantation in Japanese Patients Receiving Clopidogrel

      Background: Cytochrome P450 (CYP) 2C19 polymorphism is associated with reduced responsiveness to clopidogrel and poor clinical outcome after drug-eluting stent (DES) implantation, but its contribution to lesion outcome after DES implantation is unclear. Methods and Results: The study included 160 Japanese patients who received clopidogrel and underwent DES implantation with follow-up angiography. Patients were divided into 3 groups by CYP2C19 polymorphism: extensive metabolizers (EM), intermediate metabolizers (IM), and poor metabolizers (PM). The incidence of major adverse cardiac events (MACE) and target lesion revascularization (TLR) were compared among the 3 groups. Optical coherence tomography (OCT) was performed for 120 patients to ...

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    4. Optical coherence evaluation for everolimus-eluting stents at 8 months after implantation

      Optical coherence evaluation for everolimus-eluting stents at 8 months after implantation
      Objective The aim of this study was to evaluate detailed vessel response after everolimus-eluting stents (EES) implantation in human de novo coronary lesions by optical coherence tomography (OCT). Design, setting and patients Between November 2008 and October 2009, 25 patients (14 men, 65.5±8.6 years) with de novo native coronary artery lesions were implanted with 30 EES, and OCT was performed at 8 months post-implantation. Main Outcome Measures Neointimal thickness (NIT) on each strut, strut apposition to the vessel wall, the frequency of struts surrounded by low intensity area and the incidence of intra-stent thrombus were analysed. To ...
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    5. The Ability of Optical Coherence Tomography to Monitor Percutaneous Coronary Intervention: Detailed Comparison with Intravascular Ultrasound

      The Ability of Optical Coherence Tomography to Monitor Percutaneous Coronary Intervention: Detailed Comparison with Intravascular Ultrasound
      ABSTRACT: Background. We investigated the usefulness of optical coherence tomography (OCT) to evaluate vessel response after stent implantation by comparing with that of intravascular ultrasound (IVUS). Methods and Results. Eighteen cases undergoing percutaneous coronary intervention (PCI) who provided consent for both IVUS and OCT usage pre- and post-PCI procedure were enrolled. The lumen area at the distal site of the culprit lesion was smaller on OCT images than on IVUS images due to proximal vessel occlusion, whereas the lumen area at the proximal site of the lesion did not differ between OCT and IVUS images (distal site: 4.6 ± 2 ...
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    6. Comparison by Optical Coherence Tomography of Paclitaxel-Eluting Stents With Sirolimus-Eluting Stents Implanted in One Coronary Artery in One Procedure: 6-Month Follow-up

      Comparison by Optical Coherence Tomography of Paclitaxel-Eluting Stents With Sirolimus-Eluting Stents Implanted in One Coronary Artery in One Procedure: 6-Month Follow-up
      Differences between paclitaxel-eluting stents (PES) and sirolimus-eluting stent (SES) in neointimal proliferation under strictly matched conditions remain to be clarified by optical coherence tomography (OCT). Methods and Results: Between May and December 2007, 27 patients were implanted with a PES and a SES, randomized to either the proximal or distal site in a single coronary artery, and underwent follow-up angiography and OCT examination at 6 months. The frequency of vessel wall apposition with neointima was greater for PES than for SES (92.6% vs 85.8%, P<0.01). The median (25th, 75th percentiles) neointimal thickness (NIT) in PES was ...
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    7. Evaluation of the Peri-strut Low Intensity Area Following Sirolimus- and Paclitaxel-Eluting Stents Implantation: Insights From an Optical Coherence Tomography Study in Humans

      Evaluation of the Peri-strut Low Intensity Area Following Sirolimus- and Paclitaxel-Eluting Stents Implantation: Insights From an Optical Coherence Tomography Study in Humans
      Background: In previous pathological studies, paclitaxel-eluting stents (PES) showed greater fibrin deposition around stent struts, while sirolimus-eluting stent (SES) showed predominance of inflammatory cells with less fibrin deposition than PES. However, there are limited in-vivo data clarifying those qualitative differences in the process of vascular healing after 1st-generation drug-eluting stents (DES) implantation. A recent animal study has shown that peri-strut low intensity area (PLIA) seen in optical coherence tomography (OCT) imaging might represent the process of hyaluronic acid and proteoglycan replacing fibrin. Methods: A total of 60 patients who underwent 6-month follow-up OCT after SES (n=34) and PES (n ...
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    8. Examination of Accuracy and Factors Influencing Optical Coherence Tomography (OCT) Measurements

      (Article in Japanese) Introduction: Optical coherence tomography (OCT) is a new imaging modality with increasing clinical application. In the present study, we examined the accuracy and factors influencing the OCT measurements (luminal diameter, area, and stent strut thickness).Methods: We evaluated several luminal sizes of phantom model by OCT with several situations (frame-rate: 8.2 or 15.6 F/s; pullback-speed: 1.0 or 2.0 mm/s; position of Image Wire: in-center; off-center) and compared them with the actual value and the intravascular ultrasound measurements. We also evaluated the accuracy of the stent strut thickness (5 bare metal stents ...
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    9. Factors That Influence Measurements and Accurate Evaluation of Stent Apposition by Optical Coherence Tomography

      Factors That Influence Measurements and Accurate Evaluation of Stent Apposition by Optical Coherence Tomography
      kground: Factors influencing measurements and accurate evaluation of stent apposition by optical coherence tomography (OCT) are not established. Methods and Results: Phantom models of known luminal sizes and lengths were evaluated by OCT under various conditions and measurements were compared with actual values. Stents implanted into phantom models were examined by OCT to validate the measurement point on the stent strut surface for accurate evaluation of stent apposition. Strut thickness was measured at 3 points (midpoint, inner and outer surfaces of the stent shadow). The precision of OCT measurements of lumen diameter and area was satisfactory when the image wire ...
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    10. Local Determinants of Thrombus Formation Following Sirolimus-Eluting Stent Implantation Assessed by Optical Coherence Tomography

      Objectives We conducted this study to assess the prevalence and determinants of subclinical thrombus after sirolimus-eluting stent (SES) implantation. Background Angioscopic analyses have demonstrated the presence of thrombus is more common than the clinical incidence of SES thrombosis. Methods Fifty-three patients (53 lesions) underwent 6-month follow-up optical coherence tomography. A stent eccentricity index ([SEI] minimum/maximum stent diameter) was determined in each cross section. To evaluate unevenness of neointimal thickness, a neointimal unevenness score ([NUS] maximum neointimal thickness in the cross section/average neointimal thickness of the same cross section) was calculated for each cross section. Average SEI and NUS ...
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    11. Low plasma adiponectin levels are associated with presence of thin-cap fibroatheroma in men with stable coronary artery disease

      Abstract: Background: Previous studies demonstrated the inverse association of adiponectin with coronary artery disease (CAD) especially in men with acute coronary syndrome, however their association with in vivo plaque vulnerability in stable CAD, which may be reflected by the thin-cap fibroatheroma (TCFA) prevalence, remains unknown.Methods: In 50 men with stable CAD, we identified TCFA with multi-vessel examination of combined use of virtual histology intravascular ultrasound (VH-IVUS) and optical coherence tomography (OCT). The definition of TCFA was described as follows; necrotic-core rich lesion (% necrotic-core >10%) without evidence of an overlying fibrous component and % plaque-volume >40% in at least 3 consecutive ...
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    12. Delayed Neointimalization on Sirolimus-Eluting Stents: 6-Month and 12-Month Follow up by Optical Coherence Tomography

      Background: Sirolimus-eluting stents (SES) have incomplete neointimal coverage at 6-month follow up as determined with optical coherence tomography (OCT). The long-term detailed changes of neointima in SES remains to be clarified. Methods and Results: Serial changes in neointimal coverage of SES from 6 months to 12 months using OCT were examined. Of 21 SES in 13 patients, OCT was used to visualize 2,321 stent struts at 6 months and 2,285 stent struts at 12 months. The frequency of struts without neointimal coverage decreased from 6 months to 12 months (from 10.4 to 5.7%). The frequency of ...
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    13. Low Plasma Adiponectin Level and High Oxidative Stress are Associated with In Vivo Thin-Cap Fibroatheloma Prevalence in Patients with Stable Coronary Artery Disease

      Background; Few studies have investigated the association between biomarkers and in vivo plaque vulnerability in patients with stable coronary artery disease (CAD). Methods; We examined two or three vessels of 55 stable CAD patients with combined use of virtual histology intravascular ultrasound (VH-IVUS) and optical coherence tomography (OCT), and diagnosed thin-cap fibroatheroma (TCFA). The definition of TCFA was described as follow: necrotic core rich lesion (%necrotic-core>10%) without evident overlying fibrous component and %plaque-volume>40% by VH-IVUS analysis, and the thinnest fibrous-cap thickness
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    14. Local Determinants and Clinical Significance of Thrombus Formation Following Sirolimus-Eluting Stent Implantation: Insights from Optical Coherence Tomography Analysis

      Angioscopic analyses have shown the presence of subclinical thrombus in sirolimus-eluting stents (SES) is more common than the clinical incidence of stent thrombosis. However, the determinants and long term significance of subclinical thrombus remain unknown. Thirty five patients (44 stents) who received SES underwent 6 months follow-up optical coherence tomography (OCT). Patients were divided into 2 groups according to the presence of thrombus by OCT. Cross-sectional images were analyzed every 1mm. Stent eccentricity index (SEI; minimum stent diameter divided by maximum stent diameter) was determined in each cross section (CS). To assess the unevenness of neointimal thickness (NIT), a neointimal ...
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    15. Very late thrombosis of sirolimus-eluting stent due to late malapposition: Serial observations with optical coherence tomography

      A 54 years old man underwent directional coronary atherectomy in segment 7 with a partial deep-cut injury. A sirolimus-eluting stent (SES) was implanted at the restenosed post-atherectomy lesion. Six months after SES implantation, intravascular ultrasound (IVUS) examination revealed slight vessel enlargement although there were no malapposed struts. Optical coherence tomography (OCT) revealed partial stent malapposition. Ticlopidine was discontinued 3 months after SES implantation, but aspirin was continued. Twenty-nine months after SES implantation, after discontinuing aspirin for 7 days for colon polypectomy, the patient suffered an acute myocardial infarction at the SES implantation site. IVUS revealed further positive vessel remodeling and ...
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    16. Feasibility of combined use of intravascular ultrasound radiofrequency data analysis and optical coherence tomography for detecting thin-cap fibroatheroma

      Aims To evaluate the feasibility of the combined use of virtual histology (VH)-intravascular ultrasound (IVUS) and optical coherence tomography (OCT) for detecting in vivo thin-cap fibroatheroma (TCFA). Methods and results In 56 patients with angina, 126 plaques identified by IVUS findings were analysed using both VH-IVUS and OCT. IVUS-derived TCFA was defined as an abundant necrotic core (>10% of the cross-sectional area) in contact with the lumen (NCCL) and %plaque-volume >40%. OCT-derived TCFA was defined as a fibrous cap thickness of Conclusion Neither modality alone is sufficient for detecting TCFA. The combined use of OCT and VH-IVUS might be ...
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    1-16 of 16
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    Factors That Influence Measurements and Accurate Evaluation of Stent Apposition by Optical Coherence Tomography Evaluation of the Peri-strut Low Intensity Area Following Sirolimus- and Paclitaxel-Eluting Stents Implantation: Insights From an Optical Coherence Tomography Study in Humans Comparison by Optical Coherence Tomography of Paclitaxel-Eluting Stents With Sirolimus-Eluting Stents Implanted in One Coronary Artery in One Procedure: 6-Month Follow-up The Ability of Optical Coherence Tomography to Monitor Percutaneous Coronary Intervention: Detailed Comparison with Intravascular Ultrasound Optical coherence evaluation for everolimus-eluting stents at 8 months after implantation Beating Cancer - One Patient at a Time Conavi Medical and Japan Lifeline Announce MHLW Approval of Novasight Hybrid Intravascular Imaging System for Japanese Market Capsule Endomicroscopy for Visualization of the Small Intestine in EED Population in Pakistan Three-dimensional detection and quantification of defects in SiC by optical coherence tomography University of Illinois at Chicago Receives NIH Grant for Functional Tomography of Neurovascular Coupling Interactions in Healthy and Diseased Retinas Dyad Medical Receives NIH Grant for Software For OCT Analysis of Vascular Stents Oregon Health and Science University Receives NIH Grant for Application of Ultrahigh-Speed Long-Range Wide-Field OCT in Anterior Eye Diseases