1. Articles from Junya Ako

    1-9 of 9
    1. Impact of underlying plaque type on strut coverage in the early phase after drug-eluting stent implantation

      Impact of underlying plaque type on strut coverage in the early phase after drug-eluting stent implantation

      Background The aim of this study was to investigate whether the underlying plaque type affects the neointimal coverage after drug-eluting stent implantation. Methods A total of 1793 struts in 22 zotarolimus-eluting stents were assessed using optical coherence tomography imaging within 3 months of implantation. Neointimal coverage was evaluated within 5 mm from each stent edge on cross-sectional optical coherence tomography images at every 1-mm interval. The percentage of struts covered by neointima was compared among the normal segment group, the fibrous plaque group, and the lipid plaque group on the basis of the underlying plaque type. Results The percentage of ...

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    2. Early Phase Arterial Reaction Following Drug-Eluting and Bare-Metal Stent Implantation in Patients With ST-Segment Elevation Myocardial Infarction Optical Coherence Tomography Assessment at 2 Weeks

      Early Phase Arterial Reaction Following Drug-Eluting and Bare-Metal Stent Implantation in Patients With ST-Segment Elevation Myocardial Infarction Optical Coherence Tomography Assessment at 2 Weeks

      The early phase arterial reaction after implantation of second-generation drug-eluting stents (2nd DES) and baremetal stents (BMS) in patients with ST-segment elevation myocardial infarction (STEMI) remains unclear. The MECHANISM pilot study is a multi-center prospective registry that enrolled 24 STEMI patients (from 11 centers) who had undergone implantation of everolimus-eluting ( n = 6), biolimus A9-eluting ( n = 6) or zotarolimus-eluting stents ( n = 6), or BMS ( n = 6). Scheduled optical coherence tomography (OCT) was performed 2 weeks after implantation, and images were independently analyzed at a core laboratory in a blinded fashion. Intra-stent thrombus was quantitatively analyzed in terms of the maximal area ...

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    3. Low eicosapentaenoic acid to arachidonic acid ratio is associated with thin-cap fibroatheroma determined by optical coherence tomography

      Low eicosapentaenoic acid to arachidonic acid ratio is associated with thin-cap fibroatheroma determined by optical coherence tomography

      Background A low eicosapentaenoic acid (EPA)/arachidonic acid (AA) ratio is known to be associated with cardiovascular events. However, the relationship between the EPA/AA ratio and coronary plaque vulnerability assessed by optical coherence tomography (OCT) has not been examined thoroughly. This study examined the relationship between the EPA/AA ratio and coronary plaque vulnerability assessed by OCT in patients with acute coronary syndrome (ACS). Methods We evaluated 59 ACS patients who had undergone percutaneous coronary intervention using OCT. We divided them into 2 groups according to OCT findings—those with and without thin-cap fibroatheroma (TCFA)—and compared the EPA ...

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    4. Neointimal coverage of zotarolimus-eluting stent at 1, 2, and 3 months' follow-up: an optical coherence tomography study

      Neointimal coverage of zotarolimus-eluting stent at 1, 2, and 3 months' follow-up: an optical coherence tomography study

      Incomplete neointimal coverage and malapposed struts after stenting are associated with increased risk of stent thrombosis. We aimed to evaluate neointimal coverage early after Resolute zotarolimus-eluting stent (R-ZES) implantation using optical coherence tomography (OCT). A total of 20 patients with de novo native coronary lesions with R-ZES were enrolled. Among these patients, 20 stented lesions in 19 patients were evaluated at 1, 2, and 3 months after R-ZES implantation. The strut apposition and neointimal coverage were evaluated by OCT. Neointimal hyperplasia (NIH) thickness and percentage of covered struts and the proportion of incompletely apposed struts were measured at 1-mm intervals ...

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    5. Neoatherosclerosis 16 years following bare-metal stent implantation: Different tissue components in different underlying lesions observed with optical coherence tomography

      Neoatherosclerosis 16 years following bare-metal stent implantation: Different tissue components in different underlying lesions observed with optical coherence tomography

      A 61 years old male with a history of multiple treatments of percutaneous coronary intervention (PCI) with bare-metal stents (BMS) was admitted for the treatment of acute coronary syndrome (ACS). Sixteen years prior to this admission when he was 45years old, he experienced inferior ST-elevation myocardial infarction. He received one Palmaz-Schatz Stent (PS) for the treatment of lesion in distal right coronary artery (RCA).

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    6. 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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    7. 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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    8. 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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    1-9 of 9
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  2. Topics in the News

    1. (7 articles) Junya Ako
    2. (4 articles) Kitasato University
    3. (4 articles) Kobe University Graduate School of Medicine
    4. (4 articles) Toshiro Shinke
    5. (4 articles) Hiromasa Otake
    6. (4 articles) Ken-ichi Hirata
    7. (3 articles) Stanford University
    8. (3 articles) Peter J. Fitzgerald
    9. (3 articles) Yasuhiro Honda
    10. (2 articles) Junya Shite
    11. (1 articles) Massachusetts Eye and Ear Infirmary
    12. (1 articles) Harvard University
    13. (1 articles) University of Kent
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    15. (1 articles) Saba Adabi
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    Evaluation of the Peri-strut Low Intensity Area Following Sirolimus- and Paclitaxel-Eluting Stents Implantation: Insights From an Optical Coherence Tomography Study in Humans Neoatherosclerosis 16 years following bare-metal stent implantation: Different tissue components in different underlying lesions observed with optical coherence tomography Neointimal coverage of zotarolimus-eluting stent at 1, 2, and 3 months' follow-up: an optical coherence tomography study Low eicosapentaenoic acid to arachidonic acid ratio is associated with thin-cap fibroatheroma determined by optical coherence tomography Early Phase Arterial Reaction Following Drug-Eluting and Bare-Metal Stent Implantation in Patients With ST-Segment Elevation Myocardial Infarction Optical Coherence Tomography Assessment at 2 Weeks Successful Retrieval of Entrapped Balloon With Optical Coherence Tomography Guidance Impact of underlying plaque type on strut coverage in the early phase after drug-eluting stent implantation Repeatability, reproducibility and agreement of foveal avascular zone measurements using three different optical coherence tomography angiography devices Subclinical hypothyroidism is associated with lipid-rich plaques in patients with coronary artery disease as assessed by optical coherence tomography Mitigation of Speckle Noise in Optical Coherence Tomograms Mapping the phase and amplitude of ossicular chain motion using sound-synchronous optical coherence vibrography Avinger Receives CE Marking Approval for Pantheris SV, a New Image-Guided Atherectomy Device Designed to Treat Smaller Vessels