1. Articles from Yongcheol Kim

    1-12 of 12
    1. Assessment of the conventional radial artery with optical coherent tomography after the snuffbox approach

      Assessment of the conventional radial artery with optical coherent tomography after the snuffbox approach

      Background: This study aimed to evaluate acute injuries of the radial artery (RA) using optical coherence tomography (OCT) in patients who underwent coronary intervention via the snuffbox approach. Methods: Forty-six patients, who underwent coronary intervention and assessment of the conventional RA using OCT via the snuffbox approach, were enrolled from two university hospitals between August 2018 and August 2019. Results: The mean age of the patients was 65.1 years. In this study population, 6-French (Fr) sheaths were used. The mean diameter of the conventional RA was 2.89 ± 0.33 mm, and the mean lumen area of the conventional ...

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    2. Silent plaque rupture in the left main stem assessed by optical coherence tomography

      Silent plaque rupture in the left main stem assessed by optical coherence tomography

      A 59-year-old man underwent primary percutaneous coronary intervention (PCI) for thrombotic total occlusion of his distal right coronary artery. Bystander disease was limited to an ambiguous lesion in the distal left main stem (LMS) with an intraluminal filling defect suggestive of a ruptured plaque. A staged inpatient assessment of the LMS was undertaken utilizing invasive physiologic and intravascular imaging assessments as distal flow in the left coronary system was preserved and symptoms had settled with index intervention (Fig. 1A, B; Suppl. Video 1 and 2). Evaluation of the LMS lesion by instantaneous wave-free ratio (iFR) and fractional flow reserve (FFR ...

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    3. Successful Culotte Stenting for Unprotected Left Main Trifurcation Disease: Insights from Optical Coherence Tomography

      Successful Culotte Stenting for Unprotected Left Main Trifurcation Disease: Insights from Optical Coherence Tomography

      A 41-year-old man presenting with new-onset effort angina was referred to our clinic. Angiography revealed a left main trifurcation lesion including significant stenosis in the unprotected left main coronary artery (ULMCA), ostial left anterior descending artery (LAD), ostial left circumflex artery (LCX) with grade 3 collateral flow from the right coronary artery, and diffuse ramus intermedius artery (RI) ( Supplementary Video 1 ). After an 8-French extra backup guiding catheter with a side hole was engaged into the left coronary artery via the right femoral approach, plain old balloon angioplasty (POBA) was performed from the ULMCA to LAD, LCX, and RI, respectively ...

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    4. Optical Coherence Tomography Findings of Non-ST Elevation Myocardial Infarction with Multivessel Disease

      Optical Coherence Tomography Findings of Non-ST Elevation Myocardial Infarction with Multivessel Disease

      A 48-year-old man with a history of current smoking presented to our department with sudden-onset chest pain at rest. Elevated high sensitivity troponin level led to urgent coronary angiography (CAG). CAG revealed intermediate stenosis with multiple linear filling defects in the mid right coronary artery (RCA) ( Figure 1A ). Cross-sectional ( Figure 1B-1D ) and longitudinal ( Figure 1F ) optical coherence tomography (OCT) demonstrated a honeycomb-like structure with multiple cavities of various size separated by tissue with high-signal intensity ( Supplementary Video 1 ). Three-dimensional OCT also showed multiple cavities communicating with true lumen ( Figure 1E , asterisks) and we concluded that this represented recanalized thrombus. Regarding ...

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    5. Impact of Combination Therapy with Ezetimibe/Simvastatin Treatment on the Neointimal Response to Biodegradable Polymer Biolimus-Eluting Stent Implantation in Patients with Acute Myocardial Infarction: Serial Assessment with Optical Coherence Tomography

      Impact of Combination Therapy with Ezetimibe/Simvastatin Treatment on the Neointimal Response to Biodegradable Polymer Biolimus-Eluting Stent Implantation in Patients with Acute Myocardial Infarction: Serial Assessment with Optical Coherence Tomography

      The aim of this study was to compare the neointimal response at 12-month follow-up between ezetimibe/simvastatin (Vytorin, manufactured by Merck) 10/10 mg and Vytorin 10/40 mg after biodegradable polymer Biolimus-eluting stent (BP-BES) implantation in patients with acute myocardial infarction (AMI). A total of 20 patients requiring revascularization were randomly assigned to receive either Vytorin 10/10 mg (n = 9) or Vytorin 10/40 mg (n = 11). Baseline optical coherence tomography (OCT) was performed after stent implantation, and follow-up OCT was scheduled at 12 months. We performed follow-up OCT in 18 patients (Vytorin 10/10 mg (n = 9 ...

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    6. The role of optical coherence tomography in the setting of acute myocardial infarction

      The role of optical coherence tomography in the setting of acute myocardial infarction

      In recent years, intravascular imaging-guided percutaneous coronary intervention (PCI) has been increasing in patients with acute myocardial infarction (AMI). However, the role of optical coherence tomography (OCT) has not been established in the setting of AMI despite OCT providing superior resolution (10 μm axial resolution) and facilitating assessment of baseline lesion characteristics and post-intervention evaluation of the acute result of stent implantation, including visualization of procedural dissections, malapposition, tissue prolapse, and thrombus. We provide an overview of the potential benefits of OCT-guidance in various situations of AMI

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    7. Very late stent thrombosis derived from thin-cap neoatheroma and fibroatheroma with plaque rupture assessed by optical coherence tomography

      Very late stent thrombosis derived from thin-cap neoatheroma and fibroatheroma with plaque rupture assessed by optical coherence tomography

      A 49-year-old woman presented with sudden onset chest pain, at rest, evident of ST-segment elevation in the anterior leads of a 12-lead electrocardiogram. She received stent implantation with a 3.5 × 23 mm sirolimus-eluting stent at the proximal portion of left anterior descending artery (LAD) 10 years ago. Dual antiplatelet therapy, however, was discontinued 3 years ago. Urgent coronary angiography demonstrated a near total occlusion at the proximal portion of LAD, which was the same segment of the previous stent implantation (Fig. 1A). Optical coherence tomography

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    8. The role of optical coherence tomography in decision making during the acute phase of spontaneous coronary artery dissection

      The role of optical coherence tomography in decision making during the acute phase of spontaneous coronary artery dissection

      A 69-year-old woman with a history of treated hypertension, presented with sudden onset chest pain, at rest, and evidence of ST-segment elevation in the inferior leads of a 12-lead electrocardiogram. Urgent coronary angiography demonstrated an abrupt lumen calibre reduction extending from segment 2 of the right coronary artery (RCA) into the posterior descending artery, with preserved Thrombolysis In Myocardial Infarction (TIMI) 3 flow ( Fig. 1 A ). The postero-lateral branch of the RCA was sub-totally occluded. Having confirmed patency of the infarct-related artery and complete resolution of the patient's symptoms, we proceeded to evaluate the RCA with OCT. We demonstrated ...

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    1-12 of 12
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    1. (4 articles) Yonsei University
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    The role of optical coherence tomography in decision making during the acute phase of spontaneous coronary artery dissection Very late stent thrombosis derived from thin-cap neoatheroma and fibroatheroma with plaque rupture assessed by optical coherence tomography The role of optical coherence tomography in the setting of acute myocardial infarction Multivessel Disease With Recanalized Thrombus ― Etiologic Insights From Optical Coherence Tomography Assessment for ambiguous angiographic finding in patient with acute myocardial infarction by optical coherence tomography Optimal drug-eluting stent implantation with the aid of optical coherence tomography in the stenotic lesion of ectatic coronary artery Impact of Combination Therapy with Ezetimibe/Simvastatin Treatment on the Neointimal Response to Biodegradable Polymer Biolimus-Eluting Stent Implantation in Patients with Acute Myocardial Infarction: Serial Assessment with Optical Coherence Tomography Optical Coherence Tomography Findings of Non-ST Elevation Myocardial Infarction with Multivessel Disease Successful Culotte Stenting for Unprotected Left Main Trifurcation Disease: Insights from Optical Coherence Tomography Assessment of the conventional radial artery with optical coherent tomography after the snuffbox approach Cooperative low-rank models for removing stripe noise from OCTA images MS-CAM: Multi-Scale Class Activation Maps for Weakly-supervised Segmentation of Geographic Atrophy Lesions in SD-OCT Images