Time filter

Source Type

Im E.,Severance Cardiovascular Hospital | Kim B.-K.,Severance Cardiovascular Hospital | Ko Y.-G.,Severance Cardiovascular Hospital | Shin D.-H.,Severance Cardiovascular Hospital | And 6 more authors.
Circulation: Cardiovascular Interventions | Year: 2014

Background-We investigated the incidences, predictors, and clinical outcomes of acute and late stent malapposition detected by optical coherence tomography (OCT) after drug-eluting stent implantation. Methods and Results-We analyzed the OCT images from 351 patients with 356 lesions who received poststent and followup OCT examinations. Acute stent malapposition was observed in 62% of lesions. Approximately half of the acute stent malappositions were located within the edges of the stents. Severe diameter stenosis, calcified lesions, and long stents were independent predictors of acute stent malapposition. Follow-up OCT examinations were performed 175±60 days after drug-eluting stent implantation. Thirty-one percent of lesions with acute stent malapposition remained malapposed (late-persistent stent malapposition) and were typically (72%) located within the edges of the stent. The location within the stent edges and the volume of acute stent malapposition were independent predictors of late-persistent stent malapposition. Acute stent malapposition with a volume >2.56 mm3 differentiated late-persistent stent malapposition from resolved acute stent malapposition. Late-acquired stent malapposition was detected in 15% of all lesions and was usually (61%) located within the stent body. Late-acquired stent malapposition was more frequently associated with plaque/thrombus prolapse on poststent OCT images (70% versus 42%; P<0.001). Clinical events, including cardiovascular death, nonfatal myocardial infarction, and stent thrombosis, did not occur in patients with late stent malapposition during the follow-up period of 28.6±10.3 months after drug-eluting stent implantation. Conclusions-Acute, late-persistent, and late-acquired stent malapposition had relatively high incidences but different predictors. The clinical outcome of stent malapposition was favorable. © 2014 American Heart Association, Inc.


Chang H.-J.,Severance Cardiovascular Hospital | Chung N.,Severance Cardiovascular Hospital
Circulation Journal | Year: 2011

Since a 4-detector row coronary computed tomographic angiography (CCTA) was launched in 1998, CCTA has experienced rapid improvement of imaging qualities with the ongoing evolution of computed tomography (CT) technology. The diagnostic accuracy of CCTA to detect coronary artery stenosis is well established, whereas improvements are still needed to reduce the overestimation of coronary artery disease (CAD) and assess plaque composition. CCTA has been used to evaluate CAD in various clinical settings. For example, CCTA could be an efficient initial triage tool at emergency departments for patients with acute chest pain with low-to-intermediate risk because of its high negative predictive value. In patients with suspected CAD, CCTA could be a cost-effective alternative to myocardial perfusion imaging and exercise electrocardiogram for the initial coronary evaluation of patients with intermediate pre-test likelihood suspected CAD. However, in asymptomatic populations, there is a lack of studies that show an improved prognostic power of CCTA over other modalities. Therefore, the clinical use of CCTA to detect CAD for purposes of risk stratification in asymptomatic individuals should be discouraged. As CT technology evolves, CCTA will provide better quality coronary imaging and non-coronary information with lower radiation exposure. Future studies should cover these ongoing technical improvements and evaluate the prognostic power of CCTA in various clinical settings of CAD in large, well-designed, randomized trials.


Min J.K.,Cedars Sinai Medical Center | Dunning A.,New York Medical College | Lin F.Y.,New York Medical College | Achenbach S.,Friedrich - Alexander - University, Erlangen - Nuremberg | And 17 more authors.
Journal of the American College of Cardiology | Year: 2011

Objectives: We examined mortality in relation to coronary artery disease (CAD) as assessed by ≥64-detector row coronary computed tomography angiography (CCTA). Background: Although CCTA has demonstrated high diagnostic performance for detection and exclusion of obstructive CAD, the prognostic findings of CAD by CCTA have not, to date, been examined for age- and sex-specific outcomes. Methods: We evaluated a consecutive cohort of 24,775 patients undergoing ≥64-detector row CCTA between 2005 and 2009 without known CAD who met inclusion criteria. In these patients, CAD by CCTA was defined as none (0% stenosis), mild (1% to 49% stenosis), moderate (50% to 69% stenosis), or severe (<70% stenosis). CAD severity was judged on a per-patient, per-vessel, and per-segment basis. Time to mortality was estimated using multivariable Cox proportional hazards models. Results: At a 2.3 ± 1.1-year follow-up, 404 deaths had occurred. In risk-adjusted analysis, both per-patient obstructive (hazard ratio [HR]: 2.60; 95% confidence interval [CI]: 1.94 to 3.49; p < 0.0001) and nonobstructive (HR: 1.60; 95% CI: 1.18 to 2.16; p = 0.002) CAD conferred increased risk of mortality compared with patients without evident CAD. Incident mortality was associated with a dose-response relationship to the number of coronary vessels exhibiting obstructive CAD, with increasing risk observed for nonobstructive (HR: 1.62; 95% CI: 1.20 to 2.19; p = 0.002), obstructive 1-vessel (HR: 2.00; 95% CI: 1.43 to 2.82; p < 0.0001), 2-vessel (HR: 2.92; 95% CI: 2.00 to 4.25; p < 0.0001), or 3-vessel or left main (HR: 3.70; 95% CI: 2.58 to 5.29; p < 0.0001) CAD. Importantly, the absence of CAD by CCTA was associated with a low rate of incident death (annualized death rate: 0.28%). When stratified by age <65 years versus ≥65 years, younger patients experienced higher hazards for death for 2-vessel (HR: 4.00; 95% CI: 2.16 to 7.40; p < 0.0001 vs. HR: 2.46; 95% CI: 1.51 to 4.02; p = 0.0003) and 3-vessel (HR: 6.19; 95% CI: 3.43 to 11.2; p < 0.0001 vs. HR: 3.10; 95% CI: 1.95 to 4.92; p < 0.0001) CAD. The relative hazard for 3-vessel CAD (HR: 4.21; 95% CI: 2.47 to 7.18; p < 0.0001 vs. HR: 3.27; 95% CI: 1.96 to 5.45; p < 0.0001) was higher for women as compared with men. Conclusions: Among individuals without known CAD, nonobstructive and obstructive CAD by CCTA are associated with higher rates of mortality, with risk profiles differing for age and sex. Importantly, absence of CAD is associated with a very favorable prognosis. © 2011 American College of Cardiology Foundation.


Hadamitzky M.,Ludwig Maximilians University of Munich | Achenbach S.,Friedrich - Alexander - University, Erlangen - Nuremberg | Al-Mallah M.,Wayne State University | Berman D.,Cedars Sinai Medical Center | And 23 more authors.
Journal of the American College of Cardiology | Year: 2013

Objectives The aim of this study was to analyze the predictive value of coronary computed tomography angiography (CCTA) and to model and validate an optimized score for prognosis of 2-year survival on the basis of a patient population with suspected coronary artery disease (CAD). Background Coronary computed tomography angiography carries important prognostic information in addition to the detection of obstructive CAD. But it is still unclear how the results of CCTA should be interpreted in the context of clinical risk predictors. Methods The analysis is based on a test sample of 17,793 patients and a validation sample of 2,506 patients, all with suspected CAD, from the international CONFIRM (COronary CT Angiography EvaluatioN For Clinical Outcomes: An InteRnational Multicenter) registry. On the basis of CCTA data and clinical risk scores, an optimized score was modeled. The endpoint was all-cause mortality. Results During a median follow-up of 2.3 years, 347 patients died. The best CCTA parameter for prediction of mortality was the number of proximal segments with mixed or calcified plaques (C-index 0.64, p < 0.0001) and the number of proximal segments with a stenosis >50% (C-index 0.56, p = 0.002). In an optimized score including both parameters, CCTA significantly improved overall risk prediction beyond National Cholesterol Education Program Expert Panel on Detection, Evaluation, and Treatment of High Blood Cholesterol in Adults (Adult Treatment Panel III) score as best clinical score. According to this score, a proximal segment with either a mixed or calcified plaque or a stenosis >50% is equivalent to a 5-year increase in age or the risk of smoking. Conclusions In CCTA, both plaque burden and stenosis, particularly in proximal segments, carry incremental prognostic value. A prognostic score on the basis of this data can improve risk prediction beyond clinical risk scores.


Lee S.-W.,Yonsei University | Park K.-H.,Yonsei University | Park S.,Yonsei University | Park S.,Severance Cardiovascular Hospital | And 7 more authors.
Arthritis and Rheumatism | Year: 2013

Objective To investigate the efficacy of different doses of the soluble form of the receptor for advanced glycation end products (sRAGE) (conjugated to the Fc portion of immunoglobulin) in the treatment of nephritis in lupus-prone mice, in comparison with the efficacy of combination therapy with mycophenolate mofetil plus prednisolone. Methods Twenty-eight female (NZB/NZW)F1 mice were divided into 5 groups (untreated, sRAGE [dose groups of 0.5, 1, or 2 μg], or mycophenolate mofetil plus prednisolone). Proteinuria and histologic damage were evaluated. Immune complex deposition and the nuclear translocation of NF-κB in the kidney tissue were assessed by immunofluorescence staining. Serum concentrations of anti-double-stranded DNA (anti-dsDNA) and IgG subclasses were also measured. The population of T cells was evaluated using a fluorescence-activated cell sorter, and expression of intracellular adhesion molecule 1 and vascular cell adhesion molecule 1 in the kidney tissue was assessed by immunohistochemical staining. Results In comparison with untreated mice, mice treated with 1 or 2 μg sRAGE showed significantly reduced proteinuria and attenuated histologic renal damage, with efficacy comparable to that of combination therapy. Treatment with 2 μg sRAGE significantly reduced immune complex deposition and decreased the serum concentrations of anti-dsDNA, IgG2a, IgG2b, and IgG3. In addition, sRAGE interrupted the nuclear translocation of NF-κB in the kidney, resulting in reduction in the expression of downstream genes of NF-κB in vivo and in vitro. Furthermore, sRAGE effectively modified T cell populations. Conclusion Treatment with sRAGE significantly improved nephritis in lupus-prone mice, with efficacy comparable to that of standard induction treatment for lupus nephritis. These data suggest that sRAGE has antiinflammatory effects on the pathophysiology of lupus nephritis and could serve as a potent new therapy for this disease. Copyright © 2013 by the American College of Rheumatology.


Sung K.-C.,Sungkyunkwan University | Kang S.-M.,Severance Cardiovascular Hospital | Cho E.-J.,St Pauls Hospital | Park J.B.,Catholic Kwandong University | And 2 more authors.
Arteriosclerosis, Thrombosis, and Vascular Biology | Year: 2012

OBJECTIVE-: Ferritin concentrations are often increased in patients with metabolic syndrome and type 2 diabetes mellitus, but few reports have examined the associations between ferritin and atherosclerosis. We investigated whether any relationship between ferritin and coronary artery calcium score (CACS) >0 (as a marker of atherosclerosis) was independent of potential confounders, such as iron-binding capacity (transferrin), low-grade inflammation, and cardiovascular risk factors. METHODS AND RESULTS-: Data were analyzed from a South Korean occupational cohort of 12 033 men who underwent a cardiac computed tomography estimation of CACS and measurements of multiple cardiovascular risk factors. One-thousand three-hundred-fifteen of 12 033 (11.2%) subjects had a CACS >0. For people with a CACS >0, median (interquartile range) ferritin concentration was 196.8 (136.3-291.9) compared with 182.2 (128.1-253.6) in people with a CACS=0; P<0.001. In the highest ferritin quartile, 14.7% (442/3008) of subjects had a CACS >0 compared with 9.7% (292/3010) in the lowest quartile (P<0.0001). With increasing ferritin quartiles, there were also higher proportions of people with diabetes mellitus (P<0.0001), hypertension (P<0.0001), coronary heart disease (P=0.003), and a Framingham Risk Score >10% (P<0.0001). In logistic regression modeling with CACS >0 as the outcome, ferritin but not transferrin was independently associated with CACS >0 (odds ratio for highest quartile versus lowest quartile, 1.66 [95% CI, 1.3-1.98]; P=0.0001). CONCLUSION-: Increased ferritin concentrations are associated with the presence of a marker of early coronary artery atherosclerosis, independently of traditional cardiovascular risk factors including Framingham risk score, transferrin, preexisting vascular disease, diabetes mellitus, metabolic syndrome factors, and low-grade inflammation. © 2012 American Heart Association, Inc.


Son J.-W.,Severance Cardiovascular Hospital | Hong G.-R.,Severance Cardiovascular Hospital
Journal of Cardiovascular Ultrasound | Year: 2012

The heart is frequently the site of metastasis of various malignant tumors. Lung cancer is one of the most common primary tumors of cardiac metastasis and usually involves the pericardium or epicardium by direct invasion and/or lymphatic spread. However, metastasis of lung cancer involving the left ventricular endocardium is extremely rare. We report a patient with adenocarcinoma of lung, metastasized to the left ventricular myocardium and endocardium, diagnosed by echocardiography and 18-fludeoxyglucose positron emission tomography-computed tomography. © 2012 Korean Society of Echocardiography.


Villines T.C.,U.S. National Institutes of Health | Hulten E.A.,U.S. National Institutes of Health | Shaw L.J.,Emory University | Goyal M.,U.S. National Institutes of Health | And 20 more authors.
Journal of the American College of Cardiology | Year: 2011

Objectives: The purpose of this study was to describe the prevalence and severity of coronary artery disease (CAD) in relation to prognosis in symptomatic patients without coronary artery calcification (CAC) undergoing coronary computed tomography angiography (CCTA). Background: The frequency and clinical relevance of CAD in patients without CAC are unclear. Methods: We identified 10,037 symptomatic patients without CAD who underwent concomitant CCTA and CAC scoring. CAD was assessed as <50%, ≥50%, and ≥70% stenosis. All-cause mortality and the composite endpoint of mortality, myocardial infarction, or late coronary revascularization (≥90 days after CCTA) were assessed. Results: Mean age was 57 years, 56% were men, and 51% had a CAC score of 0. Among patients with a CAC score of 0, 84% had no CAD, 13% had nonobstructive stenosis, and 3.5% had ≥50% stenosis (1.4% had ≥70% stenosis) on CCTA. A CAC score >0 had a sensitivity, specificity, and negative and positive predictive values for stenosis ≥50% of 89%, 59%, 96%, and 29%, respectively. During a median of 2.1 years, there was no difference in mortality among patients with a CAC score of 0 irrespective of obstructive CAD. Among 8,907 patients with follow-up for the composite endpoint, 3.9% with a CAC score of 0 and ≥50% stenosis experienced an event (hazard ratio: 5.7; 95% confidence interval: 2.5 to 13.1; p < 0.001) compared with 0.8% of patients with a CAC score of 0 and no obstructive CAD. Receiver-operator characteristic curve analysis demonstrated that the CAC score did not add incremental prognostic information compared with CAD extent on CCTA for the composite endpoint (CCTA area under the curve = 0.825; CAC + CCTA area under the curve = 0.826; p = 0.84). Conclusions: In symptomatic patients with a CAC score of 0, obstructive CAD is possible and is associated with increased cardiovascular events. CAC scoring did not add incremental prognostic information to CCTA. © 2011 American College of Cardiology Foundation.


Son J.-W.,Severance Cardiovascular Hospital | Park J.-S.,Yeungnam University
Journal of Cardiovascular Ultrasound | Year: 2012

Embolization of the closure device is a rare but potentially fatal complication of percutaneous atrial septal defect (ASD) closure. We report a case of 45-year-old woman who underwent ASD device closure with 32 mm Amplatzer device, which was embolized to the pulmonary artery without symptom one day after successful device implantation. © 2012 Korean Society of Echocardiography.


PubMed | Tennessee Heart and Vascular Institute, University of Zürich, Cedars Sinai Medical Center, Severance Cardiovascular Hospital and 21 more.
Type: | Journal: International journal of cardiology | Year: 2017

Non-obstructive coronary artery disease (CAD) identified by coronary computed tomography angiography (CCTA) demonstrated prognostic value. CT-adapted Leaman score (CT-LeSc) showed to improve the prognostic stratification. Aim of the study was to evaluate the capability of CT-LeSc to assess long-term prognosis of patients with non-obstructive (CAD).From 17 centers, we enrolled 2402 patients without prior CAD history who underwent CCTA that showed non-obstructive CAD and provided complete information on plaque composition. Patients were divided into a group without CAD and a group with non-obstructive CAD (<50% stenosis). Segment-involvement score (SIS) and CT-LeSc were calculated. Outcomes were non-fatal myocardial infarction (MI) and the combined end-point of MI and all-cause mortality.Patient mean age was 5612years. At follow-up (mean 59.813.9months), 183 events occurred (53 MI, 99 all-cause deaths and 31 late revascularizations). CT-LeSc was the only multivariate predictor of MI (HRs 2.84 and 2.98 in two models with Framingham and risk factors, respectively) and of MI plus all-cause mortality (HR 2.48 and 1.94 in two models with Framingham and risk factors, respectively). This was confirmed by a net reclassification analysis confirming that the CT-LeSc was able to correctly reclassify a significant proportion of patients (cNRI 0.28 and 0.23 for MI and MI plus all-cause mortality, respectively) vs. baseline model, whereas SIS did not.CT-LeSc is an independent predictor of major acute cardiac events, improving prognostic stratification of patients with non-obstructive CAD.

Loading Severance Cardiovascular Hospital collaborators
Loading Severance Cardiovascular Hospital collaborators