Jung Han Yoon

Chonnam National University Hospital, Sŏul, Seoul, South Korea

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Publications (40)132.24 Total impact

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    ABSTRACT: The Gail model is one of the most widely used tools to assess the risk of breast cancer. However, it is known to overestimate breast cancer risk for Asian women. Here, we validate the Gail model and the Korean model using Korean data, and subsequently update and revalidate the Korean model using recent data.
    Journal of Breast Cancer 09/2014; 17(3):226-35. · 1.32 Impact Factor
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    ABSTRACT: Background Levodopa (l-dopa) therapy in Parkinson's disease (PD) increases serum homocysteine levels because of its metabolism via catechol O-methyltransferase, which may lead to endothelial dysfunction.Method We enrolled 40 PD patients treated with l-dopa, 33 PD patients treated with l-dopa/entacapone, 22 untreated PD and 30 controls, and compared the flow-mediated dilation in these subjects.ResultsThe flow-mediated dilation was significantly lower in PD patients with l-dopa (6.0 ± 1.8%) than in those with l-dopa/entacapone (7.2 ± 1.1%, P = 0.03), untreated PD patients (7.8 ± 1.2%, P < 0.05), and controls (8.5 ± 2.9%, P < 0.05). The homocysteine level was significantly higher in PD patients with l-dopa than in other groups. In a multivariate logistic regression model, the uppermost homocysteine quartile was an independent predictor of the lowest tertile of flow-mediated dilation (odds ratio, 6.33; 95% confidence interval, 1.61-26.65; P = 0.012).Conclusions Our findings indicate that endothelial dysfunction may be associated with chronic l-dopa treatment in patients with PD. © 2014 International Parkinson and Movement Disorder Society
    Movement Disorders 08/2014; · 5.63 Impact Factor
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    ABSTRACT: Recent studies have demonstrated that structural and pathologic changes are more severe in patients with dementia with Lewy bodies (DLB) than in those with Parkinson disease with dementia (PDD). We investigated neuropsychological characteristics of patients with mild cognitive impairment (MCI) stage of DLB (DLB-MCI) and PD (PD-MCI) based on the hypothesis that the pathologic differences between DLB and PDD can influence cognitive profiles in the MCI stage of these diseases. Baseline demographic characteristics and neuropsychological data obtained from patients with DLB-MCI (n=20) and PD-MCI (n=46) were compared. The patients with DLB-MCI showed poorer cognitive performance in the Stroop, Go-No-Go, and semantic fluency tests compared with those with PD-MCI. In addition, patients with DLB-MCI had lower scores on visual and verbal memory performance and in the visuospatial domain compared with PD-MCI patients. Our results demonstrate that patients with DLB-MCI have more severe cognitive impairment in frontal executive, memory, and visuospatial functions than those with PD-MCI. These data suggest that differences in pathologic substrates between PDD and DLB may begin in the MCI stage of the 2 diseases and may lead to differences in cognitive profiles.
    Alzheimer disease and associated disorders 10/2013; · 2.88 Impact Factor
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    ABSTRACT: Aim: We assessed the relationship between the level of high-sensitivity C-reactive protein (hsCRP) and cardiovascular risk factors in Korean adults.Methods: We reviewed 1,561 patients with cardiovascular disease or diabetes mellitus with hsCRP levels measured within the past year. Four cardiovascular risk groups were determined: low (<10%, 0-1 risk), moderate (<10%, >2 risk), high (10-20%) and very high (>20%) risk, according to the number of risk factors and the Framingham/NCEP ATP III risk score. The correlations between the hsCRP level and cardiovascular risk factors (age, smoking, hypertension, lipid profiles and familial history of premature coronary heart disease) were investigated.Results: The mean and median hsCRP (mg/L) levels were 1.32±9.69 and 0.29 (range: 0.01-7.48), respectively. Men had a higher median level of hsCRP than women (p<0.001). The levels of hs CRP significantly increased from the low to the very high risk group (0.15, 0.23, 0.27 and 0.47, respectively) and were significantly correlated with age, the level of glycosylated hemoglobin, body mass index (BMI), the level of high-density lipoprotein cholesterol (HDL-C), the low-density lipoprotein cholesterol (LDL-C)/HDL-C ratio, the LDL-C/total cholesterol (TC) ratio, the HDL-C/TC ratio, the HDL-C/triglyceride (TG) ratio and the TC/TG ratio. Neither smoking, the LDL-C level nor the TG level affected the hsCRP level. In a multivariate regression analysis, age, the HDL-C level, the LDL-C/TC ratio and BMI were found to be independently correlated with the hsCRP level.Conclusions: There is a significant relationship between the degree of cardiovascular risk and the hsCRP level in Korean adults with cardiovascular disease or diabetes mellitus. Assessing the hsCRP levels may thus provide additive value in predicting cardiovascular risks.
    Journal of atherosclerosis and thrombosis 05/2013; · 2.93 Impact Factor
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    ABSTRACT: Trans-radial (TR) approach is increasingly recognized as an alternative to the routine use of trans-femoral (TF) approach. However, there are limited data comparing the outcomes of these two approaches for the treatment of coronary bifurcation lesions. We evaluated outcomes of TR and TF percutaneous coronary interventions (PCI) in this complex lesion. Procedural outcomes and clinical events were compared in 1,668 patients who underwent PCI for non-left main bifurcation lesions, according to the vascular approach, either TR (n = 503) or TF (n = 1,165). The primary outcome was major adverse cardiac events (MACE), including cardiac death, myocardial infarction (MI), and target lesion revascularization (TLR) in all patients and in 424 propensity-score matched pairs of patients. There were no significant differences between TR and TF approaches for procedural success in the main vessel (99.6% vs 98.6%, P = 0.08) and side branches (62.6% vs 66.7%, P = 0.11). Over a mean follow-up of 22 months, cardiac death or MI (1.8% vs 2.2%, P = 0.45), TLR (4.0% vs 5.2%, P = 0.22), and MACE (5.2% vs 7.0%, P = 0.11) did not significantly differ between TR and TF groups, respectively. These results were consistent after propensity score-matched analysis. In conclusion, TR PCI is a feasible alternative approach to conventional TF approaches for bifurcation PCI (clinicaltrials.gov number: NCT00851526).
    Journal of Korean medical science 03/2013; 28(3):388-95. · 0.84 Impact Factor
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    ABSTRACT: This study sought to compare everolimus-eluting stents (EES) with zotarolimus-eluting stents (ZES) in patients with acute myocardial infarction (AMI). There is a paucity of data to exclusively evaluate the safety and efficacy of second-generation drug-eluting stents (DES) in the setting of AMI. The present study enrolled 3,309 AMI patients treated with ZES (n = 1,608) or EES (n = 1,701) in a large-scale, prospective, multicenter registry-KAMIR (Korea Acute Myocardial Infarction Registry). Propensity score matching was applied to adjust for differences in baseline clinical and angiographic characteristics, producing a total of 2,646 patients (1,343 receiving ZES, and 1,343 receiving EES). Target lesion failure (TLF) was defined as the composite of cardiac death, recurrent nonfatal myocardial infarction, or target lesion revascularization. Major clinical outcomes at 1 year were compared between the 2 propensity score-matched groups. After propensity score matching, baseline clinical and angiographic characteristics were similar between the 2 groups. Clinical outcomes of the propensity score-matched patients showed that, despite similar incidences of recurrent nonfatal myocardial infarction and in-hospital and 1-year mortality, patients in the EES group had significantly lower rates of TLF (6.5% vs. 8.7%, p = 0.029) and probable or definite stent thrombosis (0.3% vs. 1.6%, p < 0.001), compared with those in the ZES group. Furthermore, there was a numerically lower rate of target lesion revascularization (1.2% vs. 2.2%, p = 0.051) in the EES group than in the ZES group. In this propensity-matched comparison, EES seems to be superior to ZES in reducing TLF and stent thrombosis in patients with AMI.
    JACC. Cardiovascular Interventions 09/2012; 5(9):936-45. · 1.07 Impact Factor
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    ABSTRACT: The optimal loading dose of clopidogrel in patients with chronic kidney disease who undergo primary percutaneous coronary intervention for ST-segment elevation myocardial infarction has not been investigated. The aim of this study was to assess the impact of clopidogrel loading dose on clinical outcomes in this setting. A total of 1,457 patients with CKD (estimated glomerular filtration rate <60 ml/min/1.73 m(2)) were evaluated according to clopidogrel loading dose: 600 mg (n = 861) versus 300 mg (n = 596). In-hospital complications, including major bleeding and clinical outcomes at 1 and 12 months, were compared between the 2 groups. The in-hospital major bleeding rate was similar (0.8% vs 0.2%, p = 0.09). Also, there were no differences in major adverse cardiac event rates, including death, recurrent myocardial infarction, target lesion revascularization, and stent thrombosis, at 1 month (15.6% vs 16.4%, p = 0.70) and 12 months (19.0% vs 21.3%, p = 0.32). On multivariate analysis, a 600-mg loading dose of clopidogrel was not an independent predictor of 1-month (odds ratio 1.13, 95% confidence interval 0.49 to 2.57, p = 0.78) and 12-month (odds ratio 0.89, 95% confidence interval 0.52 to 1.51, p = 0.66) major adverse cardiac events. After propensity score-matched analysis, these results were unchanged. In conclusion, a 600-mg loading dose of clopidogrel was not effective in reducing 1- and 12-month major adverse cardiac events in patients with chronic kidney disease who underwent primary percutaneous coronary intervention for ST-segment elevation myocardial infarction, but this dose did not increase the in-hospital major bleeding rate.
    The American journal of cardiology 08/2012; · 3.58 Impact Factor
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    ABSTRACT: BACKGROUND: Debate continues over the importance of periprocedural myocardial infarction (PMI) after percutaneous coronary intervention (PCI). We evaluated the prognostic significance of PMI in patients undergoing PCI for bifurcation lesions. METHODS: Between January 2004 and June 2006, patients from 16 centers who received non-left main bifurcation lesion PCIs were enrolled. PMI was defined as a peak creatine kinase-myocardial band (CK-MB) ≥3 times the upper limit of normal after PCI. We compared long-term cardiac mortality between patients with and without PMI. RESULTS: Among the 1188 patients, PMI occurred in 119 (10.0%). Left ventricular ejection fraction<50% (adjusted hazard ratio [HR]: 2.08, 95% confidence interval [CI]: 1.13-3.82, p=0.018), multi-vessel coronary artery disease (adjusted HR: 2.28, 95% CI: 1.36-3.81, p=0.002), and PCI-related acute closure in a side branch (adjusted HR: 3.34, 95% CI: 1.23-9.02, p=0.018) were the significant risk factors for PMI. During the median follow-up of 22.7months, the unadjusted rate of long-term cardiac mortality was significantly higher in patients with PMI than in those without PMI (2.5% vs. 0.7%, p=0.026). After multivariable adjustment, the relationship between PMI and short-term (≤30day) cardiac mortality was significant (adjusted HR: 12.32, 95% CI: 1.07-141.37, p=0.044). However, PMI was not an independent prognostic factor of long-term cardiac mortality (adjusted HR: 2.59, 95% CI: 0.62-10.85, p=0.20). CONCLUSIONS: PMI occurs in patients with a higher prevalence of adverse cardiac risks and predicts short-term but not long-term cardiac mortality in patients undergoing bifurcation lesion PCI.
    International journal of cardiology 04/2012; · 6.18 Impact Factor
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    ABSTRACT: There has been controversy over the disparity between men and women with regard to the management and prognosis of acute myocardial infarction. Analyzing nationwide multicenter prospective registries in Korea, the aim of this study was to determine whether female gender independently imposes a risk for mortality. Data from 14,253 patients who were hospitalized for ST-segment elevation myocardial infarction from November 2005 to September 2010 were extracted from registries. Compared to men, women were older (mean age 56 ± 12 vs 67 ± 10 years, p < 0.001), and female gender was associated with a higher frequency of co-morbidities, including hypertension, diabetes, and dyslipidemia. Women had longer pain-to-door time and more severe hemodynamic status than men. All-cause mortality rates were 13.6% in women and 7.0% in men at 1 year after the index admission (hazard ratio for women 2.01, 95% confidence interval 1.80 to 2.25, p < 0.001). The risk for death after ST-segment elevation myocardial infarction corresponded highly with age. Although the risk remained high after adjusting for age, further analyses adjusting for medical history, clinical performance, and hemodynamic status diminished the gender effect (hazard ratio 1.00, 95% confidence interval 0.86 to 1.17, p = 0.821). Propensity score matching, as a sensitivity analysis, corroborated the results. In conclusion, this study shows that women have a comparable risk for death after ST-segment elevation myocardial infarction as men. The gender effect was accounted for mostly by the women's older age, complex co-morbidities, and severe hemodynamic conditions at presentation.
    The American journal of cardiology 12/2011; 109(6):787-93. · 3.58 Impact Factor
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    ABSTRACT: In patients with ST-segment elevation myocardial infarction (STEMI) and multivessel disease, complete revascularization (CR) for non-culprit lesions is not routinely recommended. The aim of this study was to compare the clinical outcomes of multivessel compared with infarct-related artery (IRA)-only revascularization in patients undergoing primary percutaneous coronary intervention (PCI) for STEMI. From the Korean Acute Myocardial Infarction Registry (KAMIR) database, 1,094 STEMI patients with multivessel disease who underwent primary PCI with drug-eluting stents were enrolled in this study. The patients were divided into two groups: culprit-vessel-only revascularization (COR, n=827) group; multivessel revascularization, including non-IRA (MVR, n=267) group. The primary endpoint of this study included major adverse cardiac events (MACEs), such as death, myocardial infarction, or target or nontarget lesion revascularization at one year. There was no difference in clinical characteristics between the two groups. During the one-year follow-up, 102 (15.2%) patients in the COR group and 32 (14.2%) in the MVR group experienced at least one MACE (p=0.330). There were no differences between the two groups in terms of rates of death, myocardial infarction, or revascularization (2.1% vs. 2.0%, 0.7% vs. 0.8%, and 11.7% vs. 10.1%, respectively; p=0.822, 0.910, and 0.301, respectively). The MACE rate was higher in the incompletely revascularized patients than in the completely revascularized patients (15% vs. 9.5%, p=0.039), and the difference was attributable to a higher rate of nontarget vessel revascularization (8.6% vs. 1.8%, p=0.002). Although multivessel angioplasty during primary PCI for STEMI did not reduce the MACE rate compared with culprit-vessel-only PCI, CR was associated with a lower rate of repeat revascularization after multivessel PCI.
    Korean Circulation Journal 12/2011; 41(12):718-25.
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    ABSTRACT: The number of hypertensive patients achieving treatment targets is not ideal with therapies that engage a single mechanism of action, and combination therapies using different mechanisms of action can increase drug efficacy in a synergistic way. This noninferiority study compared the clinical efficacy and safety profile of fixed-dose combination of amlodipine/losartan 5/50 mg and amlodipine 10 mg monotherapy in essential hypertensive patients who respond poorly to amlodipine 5 mg monotherapy. This was a double-blind, multicenter, randomized trial of hypertensive patients (N = 185) aged ≥18 years taking amlodipine 5 mg during the run-in treatment period but failed to achieve sitting diastolic blood pressure (DBP) <90 mm Hg. After randomization into the amlodipine/losartan 5/50 mg fixed-dose combination group (n = 92) and the amlodipine 10 mg monotherapy group (n = 93), treatment was maintained without dose escalation for 8 weeks. The noninferiority margin was prespecified as 4 mm Hg after 8 weeks of treatment for the difference of the average change in DBP between treatments. The primary efficacy evaluation of noninferiority was tested using a confidence interval approach with a 97.5% 1-sided lower confidence limit using the average difference in DBP measured at baseline and 8 weeks. After 8 weeks, the DBP of both groups decreased from baseline by 8.9 (6.1) and 9.4 (7.5) mm Hg, respectively (difference = -0.5 [6.9] mm Hg, 95% CI: -2.5 to 1.5). Secondary end points of reductions in DBP after 4 weeks (-8.1 [6.7] vs -9.9 [7.3] mm Hg, difference = -1.8 mm Hg, 95% CI: -3.9 to 0.2) and sitting systolic blood pressure after 4 (-10.2 [11.8] vs -12.8 [10.2] mm Hg, difference = -2.6 mm Hg, 95% CI: -5.9 to 0.6) and 8 weeks (-12.2 [11.0] vs -13.4 [11.3] mm Hg, difference = -1.2 mmHg, 95% CI: -4.4 to 2.1) were comparable between the 2 treatment groups. There were 38 adverse events in 20 patients (21.7%) in the amlodipine/losartan 5/50 mg fixed-dose combination group and 31 in 24 patients (26.1%) in the amlodipine 10 mg monotherapy group; most were mild. There were 7 adverse events in 6 patients (6.5%) related to treatment in the fixed-dose combination group and 13 in 10 patients (10.9%) in the monotherapy group (P = 0.30). Fixed-dose combination amlodipine/losartan 5/50 mg was not inferior in terms of reductions in DBP after 8 weeks of treatment and had comparable safety profile to amlodipine 10 mg in patients who did not respond to amlodipine 5 mg monotherapy. ClinicalTrials.gov identifier: NCT00940667.
    Clinical Therapeutics 11/2011; 33(12):1953-63. · 2.59 Impact Factor
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    ABSTRACT: Whether final kissing ballooning (FKB) is mandatory in the 1-stent technique is uncertain. To evaluate the effect of FKB on long-term clinical outcomes in coronary bifurcation lesions treated with the 1-stent technique. Consecutive patients undergoing percutaneous coronary intervention using drug-eluting stents for non-left main bifurcation lesions were enrolled from 16 centres in Korea between January 2004 and June 2006. In patients treated with the 1-stent technique major adverse cardiac events (MACE; cardiac death, myocardial infarction (MI), or target lesion revascularisation (TLR)) were compared between those undergoing main vessel stenting only (non-FKB group, n=736) or those undergoing FKB after main vessel stenting (FKB group, n=329). Propensity score-matching analysis was also performed in 222 patient pairs (444 from the non-FKB group and 222 from the FKB group). During follow-up (median 22 months), the FKB group had a higher incidence of MACE (HR 2.58; 95% CI 1.52 to 4.37; p<0.001) and TLR (HR 3.63; 95% CI 2.00 to 6.56; p<0.001), but not of cardiac death or MI. Most TLR occurred in the main vessel (HR 3.39 for the FKB group; 95% CI 1.86 to 6.19; p<0.001). The rate of stent thrombosis was similar in both groups (0.5% in the non-FKB group vs 0.6% in the FKB group, p=0.99). After propensity score matching, the FKB group still had higher rates of MACE and TLR than the non-FKB group (HR 2.13; 95% CI 1.15 to 3.95; p=0.02 and HR 2.84; 95% CI 1.45 to 5.55; p=0.002, respectively). In patients treated with the 1-stent technique for bifurcation lesions, FKB after main vessel stenting may be harmful mainly due to increased TLR. clinicaltrials.gov number: NCT00851526.
    Heart (British Cardiac Society) 09/2011; 98(3):225-31. · 6.02 Impact Factor
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    ABSTRACT: The aim of this study was to compare the efficacy and safety of zotarolimus-eluting stents (ZES), sirolimus-eluting stents (SES) and paclitaxel-eluting stents (PES) in patients with ST-segment elevation myocardial infarction (STEMI) undergoing primary percutaneous coronary intervention (PCI). This study was a prospective, single-blind, multicentre, randomised trial. The primary endpoint was major adverse cardiac events (MACE) at 12 months post-procedure, defined as cardiac death, recurrent myocardial infarction (MI), or ischaemia-driven target lesion revascularisation (TLR). An angiographic substudy was performed at nine months among 348 patients. From October 2006 to April 2008, 611 patients with STEMI undergoing primary PCI were randomly assigned to treatment with ZES (n=205), SES (n=204), or PES (n=202). The cumulative incidence of MACE was 5.9% in the ZES group, 3.4% in the SES group and 5.7% in the PES group at 12-month follow-up (p=0.457). There was a trend towards a lower rate of ischaemia-driven TLR at 12- (p=0.092) and 18-month (p=0.080) follow-up in the SES group compared to the ZES and PES groups. No difference was observed in rates of cardiac death, recurrent MI and combined death and/or recurrent MI among three groups at 12- and 18-month follow-up. The rate of stent thrombosis was similar among the three groups (2.0% in each group, p=1.000). As compared with SES and PES, the use of ZES in patients with STEMI undergoing primary PCI, showed similar rates of MACE, cardiac death and recurrent MI at 12 and 18 months. There was a trend towards a higher rate of TLR with ZES or PES compared to SES.
    EuroIntervention: journal of EuroPCR in collaboration with the Working Group on Interventional Cardiology of the European Society of Cardiology 09/2011; 7(8):936-43. · 3.17 Impact Factor
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    ABSTRACT: This study compared two-stent strategies for treatment of bifurcation lesions by stenting order, 'main across side first (A-family)' vs 'side branch first (S-family). The study population was patients from 16 centers in Korea who underwent drug eluting stent implantation with two-stent strategy (A-family:109, S-family:140 patients). The endpoints were cardiac death, myocardial infarction (MI), stent thrombosis (ST), and target lesion revascularization (TLR) during 3 years. During 440.8 person-years (median 20.2 months), there was 1 cardiac death, 4 MIs (including 2 STs), and 12 TLRs. Cumulative incidence of cardiac death, MI and ST was lower in A-family (0% in A-family vs 4.9% in S-family, P = 0.045). However, TLR rates were not different between the two groups (7.1% vs 6.2%, P = 0.682). Final kissing inflation (FKI) was a predictor of the hard-endpoint (hazard ratio 0.061; 95% CI 0.007-0.547, P = 0.013), but was not a predictor of TLR. The incidence of hard-endpoint of S-family with FKI was comparable to A-family, whereas S-family without FKI showed the poorest prognosis (1.1% vs 15.9%, retrospectively; P = 0.011). In conclusion, 'A-family' seems preferable to 'S-family' if both approaches are feasible. When two-stent strategy is used, every effort should be made to perform FKI, especially in 'S-family'.
    Journal of Korean medical science 08/2011; 26(8):1031-40. · 0.84 Impact Factor
  • American heart journal 07/2011; 162(1):e21-2. · 4.56 Impact Factor
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    ABSTRACT: Previous optical coherence tomography (OCT) studies in patients with drug-eluting stents (DESs)-related very late stent thrombosis (VLST) were scarce. Therefore, we investigated OCT findings of VLST after implantation of DESs. Using OCT, we analyzed the status of stent struts and neointimal characteristics in 18 patients who developed VLST after DES implantation. These results were compared to those in 57 patients with neointimal hyperplasia causing >40% diameter stenosis. Lipid-laden neointima was defined as a region with marked signal attenuation and a diffuse border. Four (22.2%) of 18 patients with VLST had ruptured and lipid-laden neointima inside DESs without uncovered or malapposed stent struts. In the remaining 14 patients who developed VLST without neointimal rupture, uncovered and malapposed struts were observed in nine and seven patients, respectively, and lipid-laden neointima in four patients. Lipid-laden neointima was more frequently observed in four patients with neointimal rupture than in 14 patients without neointimal rupture (100% vs. 28.6%, respectively, P = 0.023). Of 57 patients with neointimal hyperplasia, eight (14.0%) had lipid-laden neointima. Time to OCT study after DES implantation was significantly longer in the eight patients with lipid-laden neointima than in 49 patients without lipid-laden neointima (45.5 ± 17.7 months vs. 11.7 ± 7.2 months, respectively, P < 0.001). Lipid-laden neointima was detected in some patients with neointimal hyperplasia > 1 year after DES implantation. In addition to uncovered or malapposed struts, rupture of lipid-laden neointima inside DESs was identified in some patients with DES-related VLST.
    The international journal of cardiovascular imaging 06/2011; 28(4):715-23. · 2.15 Impact Factor
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    ABSTRACT: The optimal loading dose of clopidogrel in Asian patients with ST-segment elevation myocardial infarction (STEMI) has not been fully investigated. We compared bleeding, vascular complications, and midterm outcomes of a 300-mg versus a 600-mg loading dose of clopidogrel in a large series of Korean patients with STEMI undergoing primary percutaneous coronary intervention (PCI). A total of 2,664 STEMI patients (age 61.96 ± 11.91 years, men 70.4%) who underwent primary PCI were enrolled in this study. The patients were divided into a standard loading dose group (300 mg; n = 1,447 patients) and a high loading dose group (600 mg; n = 1,217 patients). Bleeding and vascular complications, and in-hospital and clinical outcomes up to 12 months were compared between the 2 groups. In-hospital bleeding and vascular complications were similar between the 2 groups. There were no differences in bleeding and vascular complications and in 1- and 12-month clinical outcomes, including mortality, myocardial infarction, repeated PCI, and major adverse cardiac events, between the 2 groups. These findings were consistent even after the propensity score-matched analysis. The standard loading dose of clopidogrel may be as safe and similarly effective as the high loading dose in Asian STEMI patients undergoing primary PCI.
    American heart journal 02/2011; 161(2):373-382.e1-3. · 4.56 Impact Factor
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    ABSTRACT: although intravascular ultrasound (IVUS) has been widely used for complex lesions during coronary intervention, IVUS for stenting at bifurcation lesions has not been sufficiently assessed. The aim of this study was to investigate the impact of IVUS guidance on long-term clinical outcomes during drug-eluting stent (DES) implantation for bifurcation lesions. the Korean multicenter bifurcation registry listed 1,668 patients with non-left main de novo bifurcation lesions who underwent DES implantation between January 2004 and June 2006. Using propensity score matching with clinical and angiographic characteristics, 487 patients with IVUS guidance and 487 patients with angiography guidance were selected. The long-term clinical outcomes were compared between the 2 groups. baseline clinical and angiographic characteristics were well matched and showed no significant differences between the 2 groups. Two-stent technique and final kissing ballooning angioplasty were more frequently performed in the IVUS-guided group. Maximal stent diameters at both the main vessel and the side branch were larger in the IVUS-guided group. Periprocedural creatine kinase-MB elevation (>3 times of upper normal limits) was frequently observed in the angiography-guided group. The incidence of death or myocardial infarction was significantly lower in the IVUS-guided group compared to the angiography-guided group (3.8% vs 7.8%, log rank test P = .03, hazard ratio 0.44, 95% CI 0.12-0.96, Cox model P = .04). intravascular ultrasound guidance during DES implantation at bifurcation lesions may be helpful to improve long-term clinical outcomes by reducing the occurrence of death or myocardial infarction.
    American heart journal 01/2011; 161(1):180-7. · 4.56 Impact Factor
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    ABSTRACT: Limited data exists regarding long-term clinical results and predictors of adverse outcomes after drug-eluting stents (DES) implantation for coronary bifurcation lesions in a real-world practice. A total of 1,691 non-left main bifurcation lesions with side branches ≥2.0mm in 1,668 patients undergoing DES implantation between January 2004 and June 2006 from 16 centers in Korea were evaluated. True bifurcation was found in 69.2% of lesions and 82.7% of lesions were treated with 1-stent technique. During follow-up (median 22 months), cardiac death occurred in 0.9%, myocardial infarction (MI) in 1.2%, target lesion revascularization (TLR) in 4.7% and stent thrombosis in 0.7% of patients. There was no significant difference in major adverse cardiac events (MACE: composite of cardiac death, MI and TLR) between the 1-stent and the 2-stent groups (6.1% vs 7.5%, P=0.36). Stent length in the main vessel (hazard ratio (HR) 1.02, 95% confidence interval (CI) 1.001-1.03, P=0.03), paclitaxel-eluting stent (HR 1.98, 95%CI 1.34-2.92, P=0.001) and kissing ballooning (HR 2.01, 95%CI 1.29-3.13, P=0.002) were independent predictors of MACE. Kissing ballooning increased the risk of MACE especially in the 1-stent group, but not in the 2-stent group. In this large real-world registry, overall outcomes after DES implantation in bifurcation lesions were favorable and similar between the 1-stent and 2-stent groups.
    Circulation Journal 09/2010; 74(11):2322-8. · 3.69 Impact Factor
  • American heart journal 09/2010; 160(3):e27. · 4.56 Impact Factor

Publication Stats

305 Citations
132.24 Total Impact Points


  • 2014
    • Chonnam National University Hospital
      Sŏul, Seoul, South Korea
  • 2007–2014
    • Ajou University
      • Department of Neurology
      Sŏul, Seoul, South Korea
  • 2013
    • Yonsei University Hospital
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea
  • 2011–2013
    • Wonju Severance Christian Hospital
      Genshū, Gangwon, South Korea
    • Christian Hospital
      Saint Louis, Michigan, United States
    • Sungkyunkwan University
      • School of Medicine
      Seoul, Seoul, South Korea
    • Yeungnam University
      • Division of Internal Medicine
      Onyang, South Chungcheong, South Korea
  • 2012
    • Tianjin Medical University
      T’ien-ching-shih, Tianjin Shi, China
  • 2009
    • Yonsei University
      • Department of Emergency Medicine
      Sŏul, Seoul, South Korea
    • Chonnam National University
      Gwangju, Gwangju, South Korea