1. Articles from Yun-Kyeong Cho

    1-11 of 11
    1. Comparison of optical coherence tomography–guided versus intravascular ultrasound–guided percutaneous coronary intervention: Rationale and design of a randomized, controlled OCTIVUS trial

      Comparison of optical coherence tomography–guided versus intravascular ultrasound–guided percutaneous coronary intervention: Rationale and design of a randomized, controlled OCTIVUS trial

      Background The clinical value of intracoronary imaging for percutaneous coronary intervention (PCI) guidance is well acknowledged. Intravascular ultrasound (IVUS) and optical coherence tomography (OCT) are the most commonly used intravascular imaging to guide and optimize PCI in day-to-day practice. However, the comparative effectiveness of IVUS-guided versus OCT-guided PCI with respect to clinical end points remains unknown. Methods and design The OCTIVUS study is a prospective, multicenter, open-label, parallel-arm, randomized trial comparing the effectiveness of 2 imaging-guided strategies in patients with stable angina or acute coronary syndromes undergoing PCI in Korea. A total of 2,000 patients are randomly assigned in ...

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    2. Comparison of optical coherence tomography-guided versus intravascular ultrasound-guided percutaneous coronary intervention: Rationale and Design of a Randomized, controlled OCTIVUS trial

      Comparison of optical coherence tomography-guided versus intravascular ultrasound-guided percutaneous coronary intervention: Rationale and Design of a Randomized, controlled OCTIVUS trial

      The clinical value of intracoronary imaging for percutaneous coronary intervention (PCI) guidance is well acknowledged. Intravascular ultrasound (IVUS) and optical coherence tomography (OCT) are the most common use for intravascular imaging to guide and optimize PCI in day-to-day practice. However, the comparative effectiveness of IVUS-guided and OCT-guided PCI with respect to clinical end points remains unknown. Methods and Design The OCTIVUS study is a prospective, multicenter, open-label, parallel-arm, randomized trial comparing the effectiveness of two imaging-guided strategies in patients with stable angina or acute coronary syndromes undergoing PCI in Korea. A total of 2000 patients are randomly assigned in a ...

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    3. A case report of a recurrent early and late Bioresorbable vascular scaffold thrombosis: serial angiography and optical coherence tomography findings

      A case report of a recurrent early and late Bioresorbable vascular scaffold thrombosis: serial angiography and optical coherence tomography findings

      Background In bioresorbable vascular scaffolds (BVSs), there is some concern about a possible increase in the rate of scaffold thromboses (ScTs). Although several characteristics similarly contribute to the development of both early and late ScTs, there are also clearly different pathomechanisms between the two time-dependent types of thromboses, especially with BVSs. Case presentation We recently experienced a very rare case of a 69-year-old man who had recurrent early and late ScTs with somewhat differing pathomechanisms as assessed by optical coherence tomography (OCT). For the late ScT, OCT identified a scaffold dismantling in the same place that a peri-strut low intensity ...

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    4. Optical Coherence Tomography: Defined Plaque Erosion after Removal of a Coronary Guidewire

      Optical Coherence Tomography: Defined Plaque Erosion after Removal of a Coronary Guidewire

      A 45-years-old male patient presented with a non-ST elevation myocardial infarction (MI). Coronary angiography revealed only mild luminal stenosis in the middle portion of the left anterior descending artery ( Figure 1 ). For evaluation of the culprit lesion of an acute MI (AMI), intravascular optical coherence tomography (OCT) was performed ( Figure 2A , Supplementary Video 1 ). A few cross-sectional OCT images at angiographically mildly stenotic segments showed a suspicious presence of an intracoronary thrombus adjacent to the acoustic shadow by the guidewire artifact ( Figure 2B-F ), leading to an undetermined cause of the pathomechanism of the AMI. Therefore, the guidewire was removed from ...

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    5. Discrepancy between frequency domain optical coherence tomography and intravascular ultrasound in human coronary arteries and in a phantom in vitro coronary model

      Discrepancy between frequency domain optical coherence tomography and intravascular ultrasound in human coronary arteries and in a phantom in vitro coronary model

      Background This purpose of this study is to evaluate, concomitantly with quantitative coronary angiography (QCA), the potential discrepancy between frequency domain optical coherence tomography (FD-OCT) and intravascular ultrasound (IVUS) measurements in a phantom coronary model and in human coronary arteries within and outside stented segments. Methods FD-OCT and IVUS images sequentially obtained from a phantom coronary model and 57 stented human coronary arteries were compared between each other and with QCA. Results Lumen area (LA) by IVUS was 10.1% larger (6.43 ± 0.09 mm 2 ) while by FD-OCT was similar (5.78 ± 0.09 mm 2 ) to actual ...

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    6. Angiographically minimal but functionally significant coronary lesion confirmed by optical coherence tomography

      Angiographically minimal but functionally significant coronary lesion confirmed by optical coherence tomography

      A 48-year-old man visited our hospital due to exertional chest pain. His resting electrocardiogram exhibited a T wave inversion in the inferior leads. A transthoracic echocardiogram showed a preserved left ventricular systolic function without any regional wall motion abnormalities. Multi-detector computed tomography was performed to evaluate the existence of any coronary artery disease and it revealed a significant stenosis in the right coronary artery; however, there was a minimal atherosclerotic lesion in the left coronary artery (Fig. 1A). The right coronary angiogram showed a significant stenosis in the mid portion of the right coronary artery and percutaneous coronary intervention for ...

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    7. Usefulness of Frequency Domain Optical Coherence Tomography Compared with Intravascular Ultrasound as a Guidance for Percutaneous Coronary Intervention

      Usefulness of Frequency Domain Optical Coherence Tomography Compared with Intravascular Ultrasound as a Guidance for Percutaneous Coronary Intervention

      Objectives To compare outcomes and rates of optimal stent placement between optical coherence tomography (OCT) and intravascular ultrasound (IVUS) guided percutaneous coronary intervention (PCI). Background Unlike IVUS-guided PCI, rates of clinical outcomes and optimal stent placement have not been well characterized for OCT-guided PCI. Methods The study enrolled 290 patients who underwent implantation of a second generation drug eluting stent under OCT (122 patients) or IVUS (168 patients) guidance. The two groups were compared after adjusting for baseline differences using 1:1 propensity score matching (PSM) (114 patients in each group). Optimal stent placement was defined as achieving an adequate ...

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    8. Scaffold and Edge Vascular Response Following Implantation of Everolimus-Eluting Bioresorbable Vascular Scaffold : A 3-Year Serial Optical Coherence Tomography Study

      Scaffold and Edge Vascular Response Following Implantation of Everolimus-Eluting Bioresorbable Vascular Scaffold : A 3-Year Serial Optical Coherence Tomography Study

      Objectives This study sought to investigate the in-scaffold vascular response (SVR) and edge vascular response (EVR) after implantation of an everolimus-eluting bioresorbable scaffold (BRS) using serial optical coherence tomography (OCT) imaging. Background Although studies using intravascular ultrasound have evaluated the EVR in metal stents and BRSs, there is a lack of OCT-based SVR and EVR assessment after BRS implantation. Methods In the ABSORB Cohort B (ABSORB Clinical Investigation, Cohort B) study, 23 patients (23 lesions) in Cohort B1 and 17 patients (18 lesions) in Cohort B2 underwent truly serial OCT examinations at 3 different time points (Cohort B1: post-procedure, 6 ...

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    9. A comparison of tissue prolapse with optical coherence tomography and intravascular ultrasound after drug-eluting stent implantation

      A comparison of tissue prolapse with optical coherence tomography and intravascular ultrasound after drug-eluting stent implantation

      The aim of this study was to compare the detection rate of tissue prolapse (TP) in optical coherence tomography (OCT) and intravascular ultrasound (IVUS) after drug-eluting stent (DES) implantation and evaluate clinical implication of TP at 2 years after percutaneous coronary intervention. In spite of the superiority of OCT in the aspect of resolution when it was compared to IVUS, there was little data about the superiority of OCT in detecting TP. And there has been controversy about the clinical significance of TP. We enrolled 38 patients who treated with DES implantation. OCT and IVUS measurements were performed in stented ...

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    10. Comparison of Early Strut Coverage Between Zotarolimus- and Everolimus-Eluting Stents Using Optical Coherence Tomography

      Comparison of Early Strut Coverage Between Zotarolimus- and Everolimus-Eluting Stents Using Optical Coherence Tomography
      There have been no optical coherence tomographic (OCT) data directly comparing the pattern of strut coverage between the 2 second-generation drug-eluting stents in the early period. The aim of this prospective study was to evaluate early strut coverage using optical coherence tomography 3 months after Resolute zotarolimus-eluting stent (ZES-R) or everolimus-eluting stent (EES) implantation in de novo coronary artery lesions. A total of 40 patients who were suitable for the OCT procedure and consented to the study protocol were randomized 1:1 to receive either ZES-R or EES. Among these patients, 35 stented lesions (18 ZES-R, 17 EES) in 34 ...
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    11. ComparisOn of neointimal coVerage betwEen zotaRolimus-eluting stent and everolimus-eluting stent using Optical Coherence Tomography (COVER Oct)

      ComparisOn of neointimal coVerage betwEen zotaRolimus-eluting stent and everolimus-eluting stent using Optical Coherence Tomography (COVER Oct)

      Background Data on strut surface coverage of second-generation drug-eluting stents (DES) are limited. We investigated stent strut coverage of resolute zotarolimus-eluting stent (ZES-R) or everolimus-eluting stent (EES) at 9 months after implantation using optical coherence tomography (OCT). Methods ComparisOn of neointimal coVerage betwEen zotaRolimus-eluting stent and everolimus-eluting stent using Optical Coherence Tomography (COVER OCT) is a prospective, randomized, multicenter trial comparing ZES-R to EES using OCT at 9 months after stent implantation. The primary end point was the rate of stent strut coverage at 9 months. Results A total of 51 patients were randomized to receive either ZES-R (ZES-R group ...

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    1-11 of 11
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    1. (3 articles) Yonsei University
    2. (2 articles) University of Ulsan
    3. (2 articles) Pusan National University
    4. (2 articles) Soo-Joong Kim
    5. (2 articles) Yangsoo Jang
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    ComparisOn of neointimal coVerage betwEen zotaRolimus-eluting stent and everolimus-eluting stent using Optical Coherence Tomography (COVER Oct) Comparison of Early Strut Coverage Between Zotarolimus- and Everolimus-Eluting Stents Using Optical Coherence Tomography A comparison of tissue prolapse with optical coherence tomography and intravascular ultrasound after drug-eluting stent implantation Scaffold and Edge Vascular Response Following Implantation of Everolimus-Eluting Bioresorbable Vascular Scaffold : A 3-Year Serial Optical Coherence Tomography Study Usefulness of Frequency Domain Optical Coherence Tomography Compared with Intravascular Ultrasound as a Guidance for Percutaneous Coronary Intervention Angiographically minimal but functionally significant coronary lesion confirmed by optical coherence tomography Discrepancy between frequency domain optical coherence tomography and intravascular ultrasound in human coronary arteries and in a phantom in vitro coronary model Optical Coherence Tomography: Defined Plaque Erosion after Removal of a Coronary Guidewire A case report of a recurrent early and late Bioresorbable vascular scaffold thrombosis: serial angiography and optical coherence tomography findings Comparison of optical coherence tomography-guided versus intravascular ultrasound-guided percutaneous coronary intervention: Rationale and Design of a Randomized, controlled OCTIVUS trial Retinal Vascular Features in Ocular Blunt Trauma by Optical Coherence Tomography Angiography Non-invasive imaging of a choroidal macrovessel