• 대한핵의학회지
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• 제27권1호
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• pp.51-58
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• 1993

We have anlayzed the polar maps of dipyridamole stress/rest $^{99m}Tc$-MIBI SPECT and compared the quantitated perfusion defects of dipyridamole stress polar map and the findings of coronary angiography in 56 pateints with coronary artery diseases. We performed the same day dipyridamole stress-rest myocardial SPECT, reconstructed the polar maps according to Cedars-Sinai method and quantitated perfusion detects of total myocardium and the territory of each artery, comparing the polar maps of patients with normal files. Stenosis more than 50 percent was considered significant and myocardial ischemic score was calculated as summed score of percents of main coronary arteries. Positive concordance of myocardial SPECT with coronary angiography were 82.6% with left anterior descending artery (LAD), 85.7% with left circumflex artery (LCx) and 78.6% with right coronary artery (RCA). Perfusion defect of SPECT polar map and the stenosis of coronary artery showed the contingency phi of 0.55 (p<0.0001) with total atreries, 0.38 (p = 0.016) with LAD, 0.50 (p<0.0001) with LCx and 0.40 (p = 0.007) with RCA. Dipyridamole stress percent defect of polar map was correlated with myocardial ischemic score with Spearman's rho of 0.47 (p = 0.001) in total arteries, 0.48 (p=0.001) in LAD, 0.56 (p < 0.001) in LCx and 0.38 (p=0.002) in RCA. These findings revealed that defect of the dipyridamole stress myocardial $^{99m}Tc$-MIBI SPECT and the percent extent of this defect were related with significant artery stenosis of individual arteries and the degree of stenosis. We thought that we could use the defects in the polar map of dipyridamole stress $^{99m}Tc$-MIBI SPECT for the quantification of myocardiasl perfusion decrease.

• Nuclear Medicine and Molecular Imaging
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• 제43권6호
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• pp.519-525
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• 2009

목적: 심근의 F-18 FDG 섭취는 다양한 인자에 의해 영향을 받으며, 가역적인 허혈성 심질환이 있을 경우 심근에서 포도당 대사가 증가된다고 알려졌다. 이 연구에서는 허혈성 심질환의 과거력이 없는 종양 환자에서 시행한 F-18 FDG PET/CT에서 심근 섭취 정도 및 분포를 관찰하고, 심근 관류 SPECT와 비교하여 F-18 FDG 심근 섭취 소견으로 심근 허혈을 예측할 수 있는지를 알아보고자 하였다. 대상 및 방법: 2005년 1월부터 2009년 6월까지 F-18 FDG PET/CT를 시행한 환자 중 3개월 이내에 Tc-99m sestamibi 심근 관류 SPECT를 시행한 환자 77명을 대상으로 후향적 분석을 시행하였다. 결과: 77명의 환자 중 F-18 FDG PET/CT에서 심근에 섭취가 증가하여 있는 경우는 55명(71.4%)이었다. 이 중 40명은 균등 심근 섭취를 보였고 15명은 국소 심근 섭취를 보였다. 균등 F-18 FDG 섭취 증가를 보인 40명의 환자 중 17명(42.5%)에서 격벽에 섭취 감소가 관찰되었으나, 심근 관류 SPECT상 유의한 관류 이상은 관찰되지 않았다. 전체 심근에 균등한 섭취를 보인 23명(57.5%) 중 1명(4.3%)에서 하벽에 가역적인 관류 결손이 관찰되었고, 1명(4.3%)에서 측벽에 비가역적인 관류 결손이 관찰되었으며, 21명(91.3%)에서는 관류 결손이 관찰되지 않았다. 국소 심근 섭취를 보인 15명 중 9명(60.0%)은 기저부에 국소 섭취 증가를 보였고, 이 중 1명에서 심첨측벽에 가역적인 관류 결손이 관찰되었다. 국소적인 심근 섭취를 보인 나머지 6명(40.0%)의 환자 중에서 4명(66.7%)의 환자에서 가역적인 관류 결손이 관찰되었다. 결론: 전신 F-18 PET/CT에서 심근에 격벽 감소나 기저부 증가를 제외한 국소적인 섭취 증가가 관찰되는 경우에는 허혈성 심질환의 가능성이 있으므로 추가적인 진단 검사가 필요하다.

• Radiation Oncology Journal
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• 제25권1호
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• pp.26-33
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• 2007

목 적: 좌측 조기유방암으로 보존수술 후 2차원 또는 3차원 모의치료를 통해 방사선치료를 받은 환자들에서 SPECT (single photon emitted computerized tomography) 영상을 이용하여 심근관류결손의 부위와 빈도를 비교 평가하고자 하였다. 대상 및 방법: 2002년 1월부터 2003년 8월까지 AJCC 병기 T1-T2N0M0인 좌측 조기유방암으로 진단되어 외과에서 보존수술 및 화학요법 후 방사선치료를 시행하였던 32명의 환자들을 대상으로 하였다. X선 투시기를 이용한 2차원 모의치료를 통해 방사선치료를 받은 환자들과 컴퓨터단층촬영 기반의 3차원 모의치료 방법을 이용했던 환자들을 구분하여 연구를 진행하였다. 이들을 대상으로 최소 3년 이상의 추적관찰 기간 후에 technetium-99m-sestamibi gated perfusion SPECT를 시행하여 각 군에서의 심근관류결손의 부위와 빈도를 비교 평가하였고, 각 환자들에서의 심벽의 운동상태와 좌심실의 박출량을 측정하여 분석하였다. 또한 모의치료 과정에서 방사선에 피폭되는 심장영역을 각 군에서 측정하여 심근관류결손과의 상관관계를 알아보았다. 결 과: SPECT 영상 결과, 심근관류결손이 확인된 경우는 전체 32명의 환자 중 11명(34.4%)이었다. 2차원 모의치료를 받은 15명의 환자 중 7명(46.7%)에서, 3차원 모의치료를 받은 17명의 환자 중 4명(23.5%)에서 관류결손이 발견되었는데, 3차원 모의치료를 이용한 환자들에서 심근관류결손의 빈도가 통계적으로 유의하게 낮았다(p=0.0312). 심근관류결손이 확인된 11명 중, 심첨부 결손을 보인 경우가 10명으로 대부분을 차지했다. 심벽의 운동상태와 심실박출량은 모두 정상이었으며, 방사선 조사야에 포함된 심장영역은 3차원 모의치료 군에서 보다 작았으나 양군에서의 심근관류결손과의 통계적 유의성은 확인할 수 없었다. 결 론: 저자들은 이번 연구를 통해 좌측 조기유방암 환자에서 보존수술 후 방사선치료 시 전산화단층촬영 모의치료기를 이용한 3차원 모의치료 방법을 이용하면 심근에 대한 조사용적을 줄일 수 있어 심근관류결손의 빈도를 낮출 수 있음을 확인하였다. 그러나 심근관류스캔상의 결손과 향후 임상적인 허혈성 심장질환으로의 발전 또는 이로 인한 사망률의 증가와의 연관성은 장기간의 추적관찰과 전향적 임상연구를 통해 확인할 필요가 있겠다.

• Journal of Preventive Medicine and Public Health
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• 제45권5호
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• pp.291-300
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• 2012

Objectives: We aimed to estimate the annual socioeconomic burden of coronary heart disease (CHD) in Korea in 2005, using the National Health Insurance (NHI) claims data. Methods: A prevalence-based, top-down, cost-of-treatment method was used to assess the direct and indirect costs of CHD (International Classification of Diseases, 10th revision codes of I20-I25), angina pectoris (I20), and myocardial infarction (MI, I21-I23) from a societal perspective. Results: Estimated national spending on CHD in 2005 was $2.52 billion. The majority of the spending was attributable to medical costs (53.3%), followed by productivity loss due to morbidity and premature death (33.6%), transportation (8.1%), and informal caregiver costs (4.9%). While medical cost was the predominant cost attribute in treating angina (74.3% of the total cost), premature death was the largest cost attribute for patients with MI (66.9%). Annual per-capita cost of treating MI, excluding premature death cost, was $3183, which is about 2 times higher than the cost for angina ($1556). Conclusions: The total insurance-covered medical cost ($1.13 billion) of CHD accounted for approximately 6.02% of the total annual NHI expenditure. These findings suggest that the current burden of CHD on society is tremendous and that more effective prevention strategies are required in Korea.

• Nuclear Medicine and Molecular Imaging
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• 제43권3호
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• pp.159-164
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• 2009

Coronary artery disease is on the rise over the world. Myocardial perfusion SPECT is a well established technique to detect coronary artery disease and to assess left ventricular function. In addition, it has the unique ability to predict the prognosis of the patients. Moreover, the application of ECC-gated images provided the quantitatve data and improved the accuracy. This approach has been proved to be cost-effective and suitable for the emerging economies as well as developed countries. However, the utilization of nuclear cardiology procedures vary widely considering the different countries and region of the world. Korea exits 2-3 times less utilization than Japan, and 20 times than the United States. Recently, with the emerging of new technology, namely cardiac CT, cardiac MR and stress echocardiography, the clinical usefulness of nuclear cardiology has been called in question and its role has been redefined. For the proper promotion of nuclear cardiology, special educations should be conducted since the nuclear cardiology has the contact points between nuclear medicine and cardiology. Several innovations are in horizon which will impact the diagnostic accuracy as well as imaging time and cost savings. Development of new tracers, gamma camera technology and hybrid systems will open the new avenue in cardiac imaging. The future of nuclear cardiology based on molecular imaging is very exciting. The newly defined biologic targets involving atherosclerosis and vascular vulnerability will allow the answers for the key clinical questions. Hybrid techniques including SPECT/CT indicate the direction in which clinical nuclear cardiology may be headed in the immediate future. To what extent nuclear cardiology will be passively absorbed by other modalities, or will actively incorporate other modalities, is up to the present and next generation of nuclear cardiologists.

• Progress in Superconductivity
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• 제8권1호
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• pp.46-53
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• 2006

Magnetocardiography(MCG) has been proposed as a novel and non-invasive diagnostic tool for the detection of cardiac electrical abnormality associated with myocardial ischemia. In our previous study, we have proposed a new classification method of MCG parameters, based on the different populations of the parameters between coronary artery disease(CAD) patients, symptomatic patients and healthy volunteers. We used four parameters, representing the directional changes of the electrical activity in the period of an R-ST-T interval. In patients with chest pain and without ST-segment elevation, who were selected consecutively from all patients admitted to the hospital in 2004, the patients with CAD could be classified with a higher sensitivity than conventional methods, showing that the proposed method can be useful for the diagnosis of CAD with MCG. In this study, we examined the validity of the algorithm with the prior probability distribution in diagnosis of new patients admitted to the hospital in 2005. In the results, presence of CAD could be found with sensitivity and specificity of 81.3% and 71.4%, respectively, in patients with chest pain and non-diagnostic ECG findings.

• 대한핵의학회지
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• 제34권6호
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• pp.487-496
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• 2000

목적: 국소 심근 벽 운동과 수축기 심근두꺼워짐에 대한 자동정량화 소프트웨어의 재현성을 알아보고자 하였다. 대상 및 방법: 31명의 무작위 추출한 관상동맥질 환자에서 부하 게이트 Tc-99m-MIBI SPECT를 시행하는 중에, 게이트 심근 SPECT를 1회 시행한 이후 바로 이어 한번 더 게이트 SPECT를 시행하였다. 얻어진 영상으로부터 AutoQUANT 소프트웨어를 이용하여 분절별, 심근벽별로 심근벽 운동과 수축기 심근두꺼워짐의 자동정량값을 얻어, 1회째 값과 2회째 값 사이의 상관계수를 계산하고 Bland-Altman 도표를 통해 변이의 범위를 보았다. 또 각 값들을 등급화한 수치 간에 kappa 값을 구해보았다. 결과: 재현성 분석에서 1회와 2회 시행간의 상관계수는 각각 0.948, 0.878이었으며, weighted kappa 값은 0.807, 0.708로 아주 좋은 일치도를 보였다. Bland-Altman 분석에서 변이의 2 표준편차 범위는 각각 ${\pm}2.0mm,\;{\pm}20.2%$였다. 각각의 재현성은 분절영역, 성별, 관류의 수준에 따라 차이를 보이지 않았다. 결론: 이 연구에서 우리는, 심근 벽 운동과 수축기 심근두꺼워짐의 자동정량화 소프트웨어가 좋은 재현성을 가지고 있음을 알았으며, 또한 추적 검사나 치료효과 판정시 심근 벽 운동과 수축기 심근두꺼워짐의 변화 판정 기준을 마련하였다.

• Korean Circulation Journal
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• 제53권12호
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• pp.829-839
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• 2023

Background and Objectives: There is limited data on the impact of type 2 myocardial infarction (T2MI) during the coronavirus disease 2019 (COVID-19) pandemic. Methods: The National Inpatient Sample (NIS) database from January 2019 to December 2020 was queried to identify T2MI hospitalizations based on the appropriate International Classification of Disease, Tenth Revision-Clinical Modification codes. Monthly trends of COVID-19 and T2MI hospitalizations were evaluated using Joinpoint regression analysis. In addition, the multivariate logistic and linear regression analysis was used to compare inhospital mortality, coronary angiography use, and resource utilization between 2019 and 2020. Results: A total of 743,535 patients hospitalized with a diagnosis of T2MI were identified in the years 2019 (n=331,180) and 2020 (n=412,355). There was an increasing trend in T2MI hospitalizations throughout the study period corresponding to the increase in COVID-19 hospitalizations in 2020. The adjusted odds of in-hospital mortality associated with T2MI hospitalizations were significantly higher in 2020 compared with 2019 (11.1% vs. 8.1%: adjusted odds ratio, 1.19 [1.13-1.26]; p<0.01). In addition, T2MI hospitalizations were associated with lower odds of coronary angiography and higher total hospitalization charges, with no difference in the length of stay in 2020 compared with 2019. Conclusions: We found a significant increase in T2MI hospitalizations with higher in-hospital mortality, total hospitalization costs, and lower coronary angiography use during the early COVID-19 pandemic corresponding to the trends in the rise of COVID-19 hospitalizations. Further research into the factors associated with increased mortality can increase our preparedness for future pandemics.

• Progress in Superconductivity
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• 제10권1호
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• pp.6-11
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• 2008

Multi-channel magnetocardiography (MCG) has been proposed to detect ischemic heart disease because its sensitivity is quite high comparing with other conventional diagnostic tools. Especially, current map and magnetic field map of MCG provide crucial information on whether myocardiac muscles maintain the normal conduction pathway. In addition, MCG parameters derived from repolarization are useful to detect coronary artery disease. Recently, there was a study reporting that R- and T- wave amplitude are highly correlated with ischemic heart disease. In this study, we studied R- and T-wave amplitude and their ratio as well as MCG parameters. MCG data from 20 young, 20 age-matched controls, and 20 myocardial infarction (MI) patients were analyzed. As a result, MCG parameters showed significant change in MI patients comparing to those of controls. R- and T-wave amplitude of MI patients showed a feature of severe ischemic heart disease even though it was difficult to find consistent values. Further study is needed to reveal the relations between small T-wave amplitude and coronary artery disease.

• Journal of Korean Biological Nursing Science
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• 제23권4호
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• pp.308-317
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• 2021

Purpose: The purpose of this study was to elucidate the relationship between readiness to quit smoking and smoking cessation, and identify factors associated with smoking cessation in smokers with ischemic heart disease post-coronary angiography (CAG). Methods: This descriptive study was conducted between December 1, 2020 and May 14, 2021 at a P hospital, Busan. A total of 164 subjects completed the questionnaire including general characteristics, coronary artery disease characteristics, readiness to quit smoking, and smoking cession behavior during hospitalization and 4 weeks after discharge. Results: The success rate of smoking cessation after coronary angiography in patients with ischemic heart disease was 49.4% (n = 81). In addition, 48.2% of smokers (n = 83) attempted smoking cessation after CAG, while 39.8% showed changes in smoking behavior. The readiness to quit smoking was significantly associated with smoking cessation (OR= 2.23, p< .005). Conclusion: Readiness to quit smoking was identified as an important factor associated with smoking cessation in patients with cardiovascular disease in this study. In order to increase the smoking cessation rate, it is necessary to strengthen the readiness to quit smoking, followed by a tailored program for smoking cessation in patients with ischemic heart disease.