Jae-Joong Kim

Seoul National University Bundang Hospital, Sŏul, Seoul, South Korea

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Publications (200)809.65 Total impact

  • Journal of Cardiac Failure 08/2014; 20(8S):S119. · 3.32 Impact Factor
  • Journal of cardiac failure. 08/2014; 20(8S):S78-S79.
  • Journal of cardiac failure. 08/2014; 20(8S):S106.
  • Journal of cardiac failure. 08/2014; 20(8S):S108-S109.
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    ABSTRACT: Background: Long-term echocardiographic data on quantitative assessment of tricuspid and mitral regurgitation after heart transplantation are scarce. Methods and Results: From November 1992 to December 2008, the medical records for 201 patients (mean age, 42.8±12.4 years, 47 females) who underwent heart transplantation were reviewed. Quantitative assessment of mitral and tricuspid valve function was performed using transthoracic echocardiography through long-term follow-up. A total of 196 (97.5%) patients were evaluated with echocardiography for more than 6 months postoperatively. During a mean echocardiography follow-up duration of 89.9±54.3 months, 23 (11.4%) patients showed either tricuspid regurgitation (TR >mild; n=21, 10.4%) or mitral regurgitation (MR >mild; n=6, 3.0%); 4 (2.0%) patients experienced both significant TR and MR. Freedom from moderate-to-severe TR at 10 years was 85.5±5.1% and 93.4±2.2% for the standard and bicaval techniques, respectively (P=0.531). Freedom from moderate-to-severe MR at 10 years was 96.0±2.7% and 98.6±1.0%, respectively, for the 2 techniques (P=0.252). In multivariate analysis, older-age donor emerged as the only independent predictor of significant TR (hazard ratio 1.06, 95% confidence interval 1.01-1.12, P=0.012). Conclusions: The long-term results of atrioventricular function after heart transplantation in adults were excellent regardless of anastomotic technique. Older-age donor was significantly associated with the development of postoperative TR.
    Circulation Journal 04/2014; · 3.58 Impact Factor
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    ABSTRACT: The neurohumoral and inflammatory pathways are regarded as the main mechanisms for the progression of heart failure. We sought to investigate the prognostic value of high-sensitivity C-reactive protein (hs-CRP) and N-terminal probrain natriuretic peptide (NT-proBNP) by evaluating their relation with 12-month mortality rate in this prospective cohort study from 24 academic hospitals in Korea. In 1,608 patients with acute heart failure (AHF), the median hs-CRP and NT-proBNP values were 0.77 mg/dl (interquartile range 0.29 to 2.84) and 4,638 pg/ml (interquartile range 1,945 to 10,852), respectively. During the 12-month follow-up, 213 patients (13.3%) died. The mortality rate increased from the lowest to the highest hs-CRP quartiles (Q1 7.4%, Q2 9.5%, Q3 16.9%, Q4 19.3%, p <0.001) and NT-proBNP quartiles (Q1 7.0%, Q2 13.4%, Q3 11.6%, Q4 20.4%, p <0.001). After adjustment, both hs-CRP (hazard ratio [HR] 1.811, 95% confidence interval [CI] 1.138 to 2.882) and NT-proBNP (HR 1.971, 95% CI 1.219 to 3.187) were independent predictors of 12-month mortality among others. When combining both hs-CRP and NT-proBNP and stratifying the patients according to their median values, patients with elevation of both hs-CRP and NT-proBNP values had 2.4-fold increased hazards (HR 2.382, 95% CI 1.509 to 3.761) compared with those without elevation of both markers. In Korean patients with AHF, patients with increased levels of both hs-CRP and NT-proBNP had worse clinical outcomes. The combination of the neurohumoral and inflammatory markers may provide a better strategy for risk stratification of Asian patients with AHF.
    The American journal of cardiology 01/2014; 113(3):511–517. · 3.58 Impact Factor
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    ABSTRACT: Background Hepatitis B virus (HBV) infection is endemic in Korea. With an increasing number of heart transplantation, problems associated with hepatitis B reactivation are becoming an important issue. We aimed to evaluate the functional significance of HBV infection on outcomes of heart transplantation. Material and Methods We reviewed all medical records of overall national heart transplantation recipients and donors who had HBV hepatitis at the time of the transplantation, from March 1994 to May 2013. We investigated the HBV serology status, HBV-DNA level of donors and recipients, liver function test, immunosuppressive agent and antiviral agent prescription, and hepatitis morbidity and mortality. Results 1) There were 12 HBsAg (+) recipients and 6 HBsAg (+) donors. Median duration of follow-up was 1715 days (minimum 162 days to maximum 6553 days). 2) Nine HBsAg (+) recipients (75%), who continued antiviral treatment, have survived without any hepatic event. Reactivation of HBV developed in 3 recipients at a median duration of 238 days after transplantation. They died of fulminant hepatitis despite antiviral rescue therapy. 3) In contrast, 6 recipients with immunity to HBV before the transplantation, who had received heart from HBV (+) donors, have survived without any liver-related event. Conclusions HBV (+) recipients have perioperative results and long-term survival rates comparable to HBV (-) recipients. However, absence or cessation of antiviral prophylaxis indiscriminately brought reactivation of HBV, which rapidly progressed to hepatic failure and death. In contrast, HBV (+) hearts transplanted to HBV-immune recipients were maintained without hepatitis reactivation. Nineteen years of national experience strongly suggests that long-term antiviral prophylaxis is necessary for HBV (+) recipients.
    Annals of transplantation : quarterly of the Polish Transplantation Society. 01/2014; 19:182-7.
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    ABSTRACT: Skin cancer is the most common malignancy to arise after organ transplantation in Caucasians, but limited data are available on its incidence in Asian transplant recipients. We sought to assess the incidence of skin cancer after organ transplantation in a Korean cohort. A cohort study was conducted to determine the incidence and risk factors for skin cancers among kidney, liver, heart, or pancreas transplant recipients, treated at the Asan Medical Center in Seoul, Korea. The cumulative incidences of skin cancer were 0.70% at 5 years, 1.66% at 10 years, and 2.31% at 15 years. For all skin cancers, squamous cell carcinoma, basal cell carcinoma, and Kaposi sarcoma, the standardized incidence ratios between the recipients and the Korean general population were 30.9 (95% confidence interval, 12.4-63.6), 61.9 (12.8-180.8), 11.9 (0.3-66.1), and 565.2 (68.4-2041.6) after the end of the fifth posttransplantation year, respectively. We cannot exclude the possibility of both the underestimation because of potential missing cases and the overestimation because of the ascertainment bias. The incidence of posttransplantation skin cancer is very low in Korean patients. However, the risk of skin cancer in organ transplant recipients may be considerably higher than that in the Korean general population.
    Journal of the American Academy of Dermatology 12/2013; · 4.91 Impact Factor
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    ABSTRACT: There are no practical criteria for the use of triple antiplatelet therapy after drug-eluting stent (DES) implantation. In our present report, pooled analysis of 3 randomized studies in patients with diabetes mellitus (Drug-Eluting Stenting Followed by Cilostazol treatment reduces LAte Restenosis in patients with diabetes mellitus trial) and long coronary narrowings (Drug-Eluting Stenting Followed by Cilostazol Treatment Reduces Late Restenosis in Patients with Long Coronary Lesions trials I and II) compared triple (aspirin, clopidogrel, and cilostazol; triple group, n = 700) and dual antiplatelet therapies (aspirin and clopidogrel; dual group, n = 699) after DES implantation. Among pooled population (n = 1,399 patients), 1,173 patients with follow-up angiography were divided into 3 stent length categories (≤20, 20 to 40, and >40 mm). There was no statistical significance of in-stent restenosis (ISR) in ≤20- and 20- to 40-mm categories between 2 groups. However, ISR rate was significantly reduced in triple versus dual group in >40-mm stent length category (12.4% vs 22.1%, p = 0.008). In diabetic patients, triple group also showed significant reduction in the ISR rate in >40-mm stent length category (15.4% vs 32.3%, p = 0.003). According to postprocedural minimal lumen diameter, triple group showed a trend toward a lower ISR than that of the dual group in all categories (p = 0.033 for ≤2.5 mm, p = 0.087 for 2.5 to 3.0 mm, and p = 0.119 for >3.0 mm). In conclusion, the triple group had a significantly reduced ISR in patients with >40-mm stent length after DES implantation compared with the dual group. Therefore, this suggestion for use of triple antiplatelet therapy could be easily applied after DES implantation in routine clinical practice.
    The American journal of cardiology 09/2013; · 3.58 Impact Factor
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    ABSTRACT: Hemoconcentration is a surrogate marker of effective decongestion and diuresis therapy. Recently, hemoconcentration has been associated with decreased mortality and rehospitalization in heart failure (HF) patients. However, the prognostic power of hemoconcentration in a large sample-sized HF cohort was limited until now. We analyzed data from hospitalized patients with acute heart failure (AHF) that were enrolled in the Korean Heart Failure Registry(n=2,357). The primary end point was a composite of all-cause mortality and HF rehospitalization during the follow-up period (median=347, interquartile range=78-744days).Hemoconcentration, defined as an increased hemoglobin level between admission and discharge, was presented in 1,016 AHF patients (43.1%). In multivariable logistic regression, hemoglobin, total cholesterol, and serum glucose levels at admission, and ischemic HF, were significant determinants for hemoconcentration occurrence. The Kaplan-Meier curve showed that event-free survival was significantly higher in the hemoconcentration group compared to the non-hemoconcentration group (65.1% vs. 58.1%, log rank p<0.001). In multiple Cox proportional hazard analysis, hemoconcentration was an independent predictor of the primary end point after adjusting for other HF risk factors (hazard ratio=0.671, 95% confidence interval=0.564-0.798, p<0.001). Hemoconcentration during hospitalization was a prognostic marker of fewer clinical events in the AHF cohort. Therefore, this novel surrogate marker will help in the risk stratification of AHF patients.
    International journal of cardiology 08/2013; · 6.18 Impact Factor
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    ABSTRACT: Even in the drug-eluting stent era, restenosis has remained an unresolved issue, particularly in the treatment of complex coronary lesions. In this study, patient-level data from 3 randomized trials (Drug-Eluting Stenting Followed by Cilostazol Treatment Reduces Late Restenosis in Patients With Diabetes Mellitus [DECLARE-DIABETES] and Drug-Eluting Stenting Followed by Cilostazol Treatment Reduces Late Restenosis in Patients With Long Native Coronary Lesions [DECLARE-LONG] I and II) were pooled to estimate the differential antirestenotic efficacy of add-on cilostazol according to the implanted drug-eluting stent in patients at high risk for restenosis. A total of 1,399 patients underwent sirolimus-eluting stent (SES; n = 450), paclitaxel-eluting stent (n = 450), and zotarolimus-eluting stent (n = 499) implantation and received triple-antiplatelet therapy (TAT; aspirin, clopidogrel, and cilostazol, n = 700) and dual-antiplatelet therapy (aspirin and clopidogrel, n = 699). Randomization of antiplatelet regimen was stratified by stent type. In-stent late loss after TAT was significantly lower than that after dual-antiplatelet therapy, regardless of implanted stent type. However, the incidence of in-segment restenosis after TAT was significantly lower with SES (0.5% vs 6.7%, p = 0.014) and zotarolimus-eluting stent (12.2% vs 20.0%, p = 0.028) implantation but not paclitaxel-eluting stent implantation (14.4% vs 20.0%, p = 0.244). A significant interaction was present between stent type and antiplatelet regimen for the risk for in-segment restenosis (p = 0.004). Post hoc analysis using bootstrap resampling methods showed that the relative risk reduction for in-segment restenosis after TAT was most prominent with SES implantation. In conclusion, add-on cilostazol effectively reduced restenosis in patients at high risk for restenosis, particularly in those receiving SES, suggesting the sustainable utility of add-on cilostazol therapy in newer generation drug-eluting stents with comparable efficacy with that of SES.
    The American journal of cardiology 07/2013; · 3.58 Impact Factor
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    ABSTRACT: Objectives: A prolonged QRS duration has been associated with an unfavorable prognosis in chronic compensated heart failure (HF). However, its predictive value during an admission for acute HF is limited, even in HF with a preserved ejection fraction (EF). The purpose of this study was to evaluate the prognostic utility of the QRS duration in acute HF. Methods: Analyses were performed using data from 1,489 patients with a 2-year follow-up. The patients were selected from the Korean Acute Heart Failure Registry and were divided into three groups according to QRS duration (≤80, 81-119 or ≥120 ms). The all-cause mortality and readmission for HF were assessed. Results: During the study period, 774 primary events occurred (359 deaths and 415 HF). The event frequencies were higher in patients with a prolonged QRS duration. The increased risk associated with the QRS duration was also demonstrated after adjustment for cardiac outcome variables. The prognostic significance of the QRS duration was demonstrated in patients with reduced EF but not in those with a preserved EF. Conclusions: A prolonged QRS duration could be a significant predictor of the 2-year cardiac outcome in patients with acute HF, particularly in those with a reduced EF.
    Cardiology 05/2013; 125(2):96-103. · 1.52 Impact Factor
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    ABSTRACT: Aim: At present, limited in vivo information is available on the prevalence and severity of coronary atherosclerosis in asymptomatic healthy subjects. The aim of this study was to examine the prevalence, extent and severity of coronary atherosclerosis in healthy individuals.Methods: We performed an intravascular ultrasound (IVUS) examination on 198 heart transplant recipients 4 weeks after transplantation. The donor population consisted of 147 men and 51 women (31.4±11.0 years). The left anterior descending coronary artery was imaged in all patients, and 3 vessel images were obtained for 99 patients.Results: Angiographic appearance was completely normal in 177 of the 198 subjects (89.4%), while atherosclerotic luminal irregularities were observed in the remaining individuals. IVUS revealed that atherosclerotic lesions (defined as intimal thickness ≥0.5 mm at any site) were present in 96 patients (48.5%). The prevalence of coronary atherosclerosis rapidly increased with age (10-19 years, 5.9%; 20-29 years, 31.1%; 30-39 years, 59.0%; 40-49 years, 78.4%). In the diseased subgroup, atherosclerotic lesions were mostly eccentric (92.7%), with maximal intimal thickness of 0.99±0.42 mm (area stenosis, 32.2±11.7%). All coronary arteries were predominantly located in the proximal third of each vessel. Donor age, male sex, and hypertension were the determinants of coronary atherosclerosis measured by IVUS examination. As more risk factors were present, the risk of atherosclerosis increased.Conclusion: Coronary atherosclerosis is common in asymptomatic young healthy adults, supporting the need for preventive cardiology in the early stages of life.
    Journal of atherosclerosis and thrombosis 02/2013; · 2.93 Impact Factor
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    ABSTRACT: Metabolic syndrome (MetS) increases the risk of heart failure (HF). The purpose of this study was to identify the prevalence of MetS in patients with HF and determine the syndrome's association with HF in clinical and laboratory parameters. A total of 3200 HF patients (67.6±14.5 years) enrolled in a nationwide prospective Korea HF Registry between Jan. 2005 and Oct. 2009. Patients were divided into two groups according to the presence or absence of MetS at admission: group I (presence, n=1141) and group II (absence, n=2059). The prevalence of MetS was 35.7% across all subjects and was higher in females (56.0%). The levels of white blood cells, platelets, creatinine, glucose, and cholesterol were significantly higher in group I than in group II. Left ventricular dimension and volume was smaller and ejection fraction was higher in group I than in group II. An ischemic cause of HF was more frequent in group I. The rates of valvular and idiopathic cause were lower in group I than in group II. The rate of mortality was lower in group I than in group II (4.9% vs. 8.3%, p<0.001). Despite the increased cardiovascular risks in MetS, MetS was found to be associated with decreased mortality in HF.
    Korean Circulation Journal 02/2013; 43(2):87-92.
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    ABSTRACT: It is unknown whether the use of intravascular ultrasound (IVUS) guidance during percutaneous coronary intervention can attenuate the stent length effect on clinical outcomes. The aim of the present study was to determine the differential prognostic effect of IVUS according to the implanted stent length. We enrolled 3,244 consecutive patients from the Interventional Cardiology Research In-cooperation Society-Drug-Eluting Stents (IRIS-DES) registry who had undergone single or overlapping stent implantation. The primary end point was major adverse cardiac events (MACE; a composite of death, myocardial infarction, and target vessel revascularization). The study population was divided by the tertiles of implanted stent length and IVUS usage. IVUS use was at the discretion of the operator. After adjusting for significant covariates, the stent length was significantly associated with the risk of MACE in the no-IVUS group (hazard ratio 1.13, 95% confidence interval 1.01 to 1.28, p = 0.042) but not in the IVUS group (hazard ratio 1.08, 95% confidence interval 0.97 to 1.20, p = 0.16). In addition, in patients with an implanted stent length of ≤22 mm (n = 998), the risk of MACE was not significantly different between the IVUS group and the no-IVUS group (hazard ratio 1.06, 95% confidence interval 0.50 to 2.28, p = 0.88). In contrast, in patients with a longer implanted stent length, the risk of MACE was significantly lower in the IVUS group than in the no-IVUS group (hazard ratio 0.47, 95% confidence interval 0.24 to 0.92, p = 0.027 for 23 to 32 mm, n = 1,109; hazard ratio 0.57, 95% confidence interval 0.33 to 0.98, p = 0.042 for ≥33 mm, n = 1,137). In conclusion, IVUS usage can attenuate the detrimental effect of the increase in the implanted stent length, supporting IVUS usage, particularly during percutaneous coronary intervention with long stent implantation.
    The American journal of cardiology 12/2012; · 3.58 Impact Factor
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    ABSTRACT: The aim of this study was to describe in more detail the predisposition, natural course, and clinical impact of post-transplantation diabetes mellitus (PTDM) after heart transplantation (HT). The characteristics and clinical outcomes of 54 patients with PTDM were compared with those of 140 patients without PTDM. The mean age of PTDM patients was significantly higher than controls (48.9 ± 9.3 vs 38.6 ± 13.3 yr, respectively, P = 0.001), and ischemic heart disease was a more common indication of HT (20.4% [11/54] vs 7.1% [10/140], respectively, P = 0.008). In multivariate analysis, only recipient age (odds ratio, 1.80; 95% confidence interval, 1.35-2.40; P = 0.001) was associated with PTDM development. In 18 patients (33%), PTDM was reversed during the follow-up period, and the reversal of PTDM was critically dependent on the time taken to develop PTDM (1.9 ± 1.0 months in the reversed group vs 14.5 ± 25.3 months in the maintained group, P = 0.005). The 5-yr incidence of late infection (after 6 months) was higher in the PTDM group than in the control group (30.4% ± 7.1% vs 15.4% ± 3.3%, respectively, P = 0.031). However, the 5-yr overall survival rate was not different (92.9% ± 4.1% vs 85.8% ± 3.2%, respectively, P = 0.220). In conclusion, PTDM after HT is reversible in one-third of patients and is not a critical factor in patient survival after HT.
    Journal of Korean medical science 12/2012; 27(12):1460-7. · 0.84 Impact Factor
  • International journal of cardiology 11/2012; · 6.18 Impact Factor
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    ABSTRACT: OBJECTIVE: Hyponatraemia predicts poor prognosis in patients hospitalised for acute heart failure (AHF). Yet, the association of hyponatraemia improvement with better postdischarge outcome has not been elucidated. Here, we determined the clinical impact of hyponatraemia improvement during hospitalisation on postdischarge outcome in patients admitted for AHF. DESIGN: Prospective cohort study. SETTING: Nation-wide twenty-four academic hospitals in Korea (mean follow-up of 1.7 years after discharge). PATIENTS: 2888 patients hospitalised for AHF. MAIN OUTCOME MEASURES: Primary endpoints were composite of death or rehospitalisation due to heart failure. RESULTS: Hyponatraemia was present in 575 of total 2888 patients hospitalised for AHF at admission. Hyponatraemia was normalised in 274 patients (47.7%) at discharge. During mean follow-up of 1.7 years total 735 rehospitalisations and 397 deaths were documented. Persistent hyponatraemia during hospitalisation was significantly associated with increased incidence of composite endpoint of death or rehospitalisation in multivariate analysis compared with normonatraemia at admission (HR 1.345, 95% CI 1.075 to 1.683, p=0.010). However, improvement of hyponatraemia during hospitalisation was not significantly associated with lower incidence of composite endpoint of death or rehospitalisation in multivariate analysis (HR 1.084, 95% CI 0.709 to 1.659, p=0.709). Improved hyponatraemia was not associated with better prognosis in analysis with propensity score matching, either (HR 1.111, 95% CI 0.588 to 2.100, p=0.746). CONCLUSIONS: In patients hospitalised for AHF, hyponatraemia on admission is associated with a worse prognosis compared with normonatraemia, irrespective of whether hyponatraemia improves during hospitalisation.
    Heart (British Cardiac Society) 11/2012; · 5.01 Impact Factor
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    ABSTRACT: OBJECTIVES: The purpose of this study is to examine the risk of stroke in patients with heart failure with normal ejection fraction (HFNEF) and atrial fibrillation (AF). DESIGN: Clinical and echocardiographic data in patients with non-valvular AF who were not on anticoagulation were retrospectively investigated. A total of 304 patients had AF without heart failure, and 102 patients were diagnosed as AF with HFNEF. MAIN OUTCOME MEASURES: We compared the rate of ischaemic stroke, death and composite of these in the two groups. RESULTS: Patients with AF and HFNEF were older than those with AF only (71.6 vs 64.0 years, p<0.001). Female sex, diabetes mellitus, hypertension, chronic kidney disease, angina, myocardial infarction, use of β blocker or digoxin were more common in patients with AF and HFNEF. The rates of ischaemic stroke, death and composite of ischaemic stroke and death were higher in patients with AF and HFNEF than in those with AF only (20.6% vs 6.7%, p<0.001; 27.2% vs 2.0%, p<0.001; 41.2% vs 8.1%, p<0.001 at 3 years for AF with HFNEF vs AF only, respectively). After adjustment with propensity score method using the inverse probability of treatment weighting, the 3-year risks of for ischaemic stroke (HR 3.29; 95% CI 1.58 to 6.86; p=0.001), death (HR 5.52; 95% CI 2.24 to 13.63; p<0.001), and composite of ischaemic stroke and death (HR 4.08; 95% CI 2.30 to 7.26; p<0.001) were significantly higher in patients with AF and HFNEF. CONCLUSIONS: HFNEF is associated with an increased risk of stroke and death in patients with AF.
    Heart (British Cardiac Society) 09/2012; · 5.01 Impact Factor
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    ABSTRACT: This study was intended to investigate whether cerebral blood flow (CBF) could predict the recovery of left ventricular (LV) systolic dysfunction in patients with idiopathic dilated cardiomyopathy (DCMP). Between July 2001 and March 2009, 107 patients who had been diagnosed with idiopathic DCMP underwent radionuclide angiography to assess their CBF. The recovery of LV systolic dysfunction was defined as recovery of the ejection fraction (EF) measured by transthoracic echocardiography to a level of 40% or greater and an increase of 10% or greater in its absolute value during follow-up. The EF was followed for at least 36 months if it did not recover. Thirty-four patients (31.8%) recovered and had greater CBF than the nonrecovered patients (41.9 ± 3.4 vs. 37.1 ± 4.9 mL/min/100g, P < .001). On multivariate logistic analysis, CBF (odds ratio 1.216) and symptom duration (odds ratio 0.952) were independent predictors of the recovery of LV systolic dysfunction. There was also a weak negative correlation between CBF and symptom duration (r = -0.334, P < .001). Furthermore, CBF was associated with LVEF improvement seen at the 1- and 2-year follow-up times according to multiple linear regression analysis. CBF was associated with recovery of LV systolic dysfunction in patients with idiopathic DCMP. Therefore, measurement of CBF would be helpful to predict the clinical course of their disease.
    Journal of cardiac failure 07/2012; 18(7):549-55. · 3.25 Impact Factor

Publication Stats

3k Citations
809.65 Total Impact Points

Institutions

  • 2012–2014
    • Seoul National University Bundang Hospital
      • Cardiovascular Center
      Sŏul, Seoul, South Korea
    • Seoul National University Hospital
      • Department of Internal Medicine
      Seoul, Seoul, South Korea
    • University of California, San Francisco
      • Department of Bioengineering and Therapeutic Sciences
      San Francisco, CA, United States
  • 2002–2014
    • Asan Medical Center
      • Department of Cardiology
      Sŏul, Seoul, South Korea
    • Ulsan University Hospital
      Urusan, Ulsan, South Korea
  • 2013
    • Chonnam National University
      • Department of Cardiology
      Gwangju, Gwangju, South Korea
  • 2009–2012
    • Yonsei University Hospital
      • Department of Internal Medicine
      Sŏul, Seoul, South Korea
  • 2000–2012
    • University of Ulsan
      • • Asan Medical Center
      • • Department of Medicine
      • • College of Medicine
      Ulsan, Ulsan, South Korea
  • 2011
    • Bundang Jesaeng Hospital
      Sŏngnam, Gyeonggi Province, South Korea
  • 2005–2010
    • Soonchunhyang University
      • Department of Medicine
      Onyang, South Chungcheong, South Korea
    • Chonbuk National University Hospital
      Sŏul, Seoul, South Korea
  • 2007
    • Seoul Veterans Hospital
      Sŏul, Seoul, South Korea
    • Kangwon National University Hospital
      South Korea
  • 2003
    • Cardiovascular Research Foundation
      New York City, New York, United States