• The Korean Journal of Physiology and Pharmacology
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• 제11권2호
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• pp.57-64
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• 2007

Ischemic preconditioning (IPC) is known to protect the heart against ischemia/reperfusion (IR)-induced injuries, and regional differences in the mitochondrial antioxidant state during IR or IPC may promote the death or survival of viable and infarcted cardiac tissues under oxidative stress. To date, however, the interplay between the mitochondrial antioxidant enzyme system and the level of reactive oxygen species (ROS) in the body has not yet been resolved. In the present study, we examined the effects of IR- and IPC-induced oxidative stresses on mitochondrial function in viable and infarcted cardiac tissues. Our results showed that the mitochondria from viable areas in the IR-induced group were swollen and fused, whereas those in the infarcted area were heavily damaged. IPC protected the mitochondria, thus reducing cardiac injury. We also found that the activity of the mitochondrial antioxidant enzyme system, which includes manganese superoxide dismutase (Mn-SOD), was enhanced in the viable areas compared to the infarcted areas in proportion with decreasing levels of ROS and mitochondrial DNA (mtDNA) damage. These changes were also present between the IPC and IR groups. Regional differences in Mn-SOD expression were shown to be related to a reduction in mtDNA damage as well as to the release of mitochondrial cytochrome c (Cyt c). To the best of our knowledge, this might be the first study to explore the regional mitochondrial changes during IPC. The present findings are expected to help elucidate the molecular mechanism involved in IPC and helpful in the development of new clinical strategies against ischemic heart disease.

• 디지털융복합연구
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• 제10권9호
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• pp.391-396
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• 2012

본 연구에서는 자기공명영상(magnetic resonance imaging, MRI)을 이용하여 중년 및 초고령의 허혈성 뇌혈관 호발 부위를 분석하여 임상에 기초자료로 제시하고자 하였다. 2006년 5월부터 2008년 1월까지 허혈성 뇌혈관 질환으로 자기공명영상검사를 받은 69 명(평균나이: 44.2세, 남: 43명, 여: 26명)의 중년 환자군과 129 명(평균나이: 84.7세, 남: 58명, 여: 71명)의 초고령 환자군에 대해 후향적으로 분석하였다. 뇌혈관 부위는 앞교통 동맥(anterior communication artery, ACoA), 뒤교통 동맥(posterior communication artery, PCoA), 앞대뇌 동맥(anterior cerebral artery, ACA), 중간대뇌 동맥(middle cerebral artery, MCA), 뒤대뇌 동맥(posterior cerebral artery, PCA), 속목 동맥(internal carotid artery, ICA), 온목 동맥(common carotid artery, CCA), 그리고 뇌바닥 동맥(basilar artery, BA)으로 나누었으며, BA를 제외한 모든 혈관들의 허혈성 뇌혈관 위치는 좌, 우, 양쪽으로 분류하였다. 그 결과 허혈성 뇌혈관은 중년 환자군에서 남성이 여성보다 많았고 남성, 여성 모두 MCA에서 가장 많이 발생하였으며 초고령 환자군에서는 좌, 우, 양측의 혈관에서 고른 발생빈도와 여성이 남성보다 많았으며 남성은 ICA, 여성은 MCA에서 많이 호발하고 있었다. 특히, MCA에서 초고령의 남자환자군보다 중년의 남자 환자군에서 많이 발생하고 있었다. 이러한 허혈성 뇌혈관 호발 부위의 분석은 임상적 진단과 치료에 도움을 줄 수 있으리라 사료된다.

• Journal of Information Processing Systems
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• 제12권4호
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• pp.741-753
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• 2016

In the medical fields, many efforts have been made to develop and improve Hospital Information System (HIS) including Electronic Medical Record (EMR), Order Communication System (OCS), and Picture Archiving and Communication System (PACS). However, materials generated and used in medical fields have various types and forms. The current HISs separately store and manage them by different systems, even though they relate to each other and contain redundant data. These systems are not helpful particularly in emergency where medical experts cannot check all of clinical materials in the golden time. Therefore, in this paper, we propose a process to build an integrated data model for medical information currently stored in various HISs. The proposed data model integrates vast information by focusing on medical images since they are most important materials for the diagnosis and treatment. Moreover, the model is disease-specific to consider that medical information and clinical materials including images are different by diseases. Two case studies show the feasibility and the usefulness of our proposed data model by building models about two diseases, acute myocardial infarction (AMI) and ischemic stroke.

• Journal of Korean Neurosurgical Society
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• 제29권8호
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• pp.1107-1112
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• 2000

Recently various operative procedures including microsurgery or endovascular surgery have been increasing for the management of ischemic cerebrovascular diseases. Carotid endarterectomy(CEA), extracranial-intracranial(EC-IC) arterial bypass, embolectomy, decompressive craniectomy, arterial transposition, intravascular thrombolysis, and percutaneous transarterial angioplasty and stenting (PTAS) are available surgical modalities for ischemic stroke. This article focuses the complications and perioperative management of patients treated with CEA and carotid PTAS among various surgical managements for ischemic stroke.

• 대한핵의학회지
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• 제39권2호
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• pp.141-145
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• 2005

Hypoxia (decreased tissue oxygen tension) is a component of many diseases such as tumors, cerebrovascular diseases and ischemic heart diseases. Although hypoxia can be secondary to a low inspired $pO_2$ or a variety of lung disorders, the most common cause is ischemia due to an oxygen demand greater than the local oxygen supply. In the heart tissue, hypoxia is often observed in persistent low-flow states, such as hibernating myocardium. Direct "hot spot" imaging of myocardial tissue hypoxia is potentially of great clinical importance because it may provide a means of identifying dysfunctional chronically ischemic but viable hibernating myocardium. A series of radiopharmaceuticals that incorporate nitroimidazole moieties have been synthesized to detect decreased local tissue pO2. In contrast to agents that localize in proportion to perfusion, these agents concentrate in hypoxic tissue. However, the ideal agents are not developed yet and the progress is very slow. Furthermore, the research focus is on tumor hypoxia nowadays. This review introduces the myocardial hypoxia imaging with summarizing the development of radiopharmaceuticals.

• Nuclear Medicine and Molecular Imaging
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• 제41권2호
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• pp.91-96
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• 2007

The measurement of pathologically low levels of tissue $pO_2$ is an important diagnostic goal for determining the prognosis of many clinically important diseases including cardiovascular insufficiency, stroke and cancer. The target tissues nowaday have mostly been tumors or the myocardium, with less attention centered on the brain. Radiolabelled nitroimidazole or derivatives may be useful in identifying the hypoxic cells in cerebrovascular disease or traumatic brain injury, and hypoxic-ischemic encephalopathy. In acute stroke, the target of therapy is the severely hypoxic but salvageable tissue. $^{18}F-MISO$ PET and $^{99}mTc-EC-metronidazole$ SPECT in patients with acute ischemic stroke identified hypoxic tissues and ischemic penumbra, and predicted its outcome. A study using $^{123}I-IAZA$ in patient with closed head injury detected the hypoxic tissues after head injury. Up till now these radiopharmaceuticals have drawbacks due to its relatively low concentration with hypoxic tissues associated with/without low blood-brain barrier permeability and the necessity to wait a long time to achieve acceptable target to background ratios for imaging in acute ischemic stroke. It is needed to develop new hypoxic marker exhibiting more rapid localization in the hypoxic region in the brain. And then, the hypoxic brain imaging with imidazoles or non-imidazoles may be very useful in detecting the hypoxic tissues, determining therapeutic strategies and developing therapeutic drugs in several neurological disease, especially, in acute ischemic stroke.

• Journal of Preventive Medicine and Public Health
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• 제28권2호
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• pp.282-286
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• 1995

• Journal of Preventive Medicine and Public Health
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• 제28권2호
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• pp.287-296
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• 1995

• Journal of Preventive Medicine and Public Health
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• 제29권3호
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• pp.639-655
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• 1996

Cerebrovascular disease and coronary heart disease are the first and the fourth common causes of death among adults in Korea. Reported risk factors of these diseases are mostly alike. But some risk factors of one of these diseases may prevent other diseases. Therefore, we tried to compare and discriminate the risk factors of these diseases. We recruited four case groups and four control groups among the inpatients who were admitted to Wonju Christian Hospital from March, 1994 to November, 1995. Four control groups were matched with each of four case groups by age and sex. The number of patients in each of four case and control groups were 106 and 168 for acute myocardial infarction(AMI), 84 and 133 for subarachnoid hemorrhage(SAH), 102 and 148 for intracerebral hemorrhage(ICH), and 91 and 182 for ischemic stroke(IS) respectively. Factors whose levels were significantly higher in AMI and IS than in responding control group (RCG) were education, economic status, and triglyceride. Factors whose levels were significantly lower in hemorrhagic stroke than in RCG were age of monarch, and prothrombin time. The factor whose level was higher in AMI than ill RCG was uric acid. The factor whose level was higher in AMI, ICH, and SAM than in RCG was blood sugar. Factors whose levels were significantly higher in all the case groups than in RCG were earlobe crease, Quetelet index, white blood cell count, hemoglobin, hematocrit, and total cholesterol. The list of risk factors were somewhat different among the four diseases, though none of the risk factors to the one disease except prothrombin time acted as a preventive factor to the other diseases. The percent of grouped cases correctly classified was higher in the discrimination of ischemic diseases(AMI and IS) from hemorrhagic diseases(SAM and ICH) than in the discrimination of cerebrovascular disease from AMI. The factors concerned in the discrimination of ischemic diseases from hemorrhagic diseases were prothrombin time, earlobe crease, gender, age, uric acid, education, albumin, hemoglobin, the history of taking steroid, total cholesterol, and hematocrit according to the selection order through forward selection.

• 한국산학기술학회논문지
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• 제18권10호
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• pp.354-362
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• 2017

인구 고령화와 서구화된 생활로 인한 허혈성 심장질환이 지속적으로 증가하고 있으며, 우리나라는 OCED 국가 중에서 허혈성 심장질환의 재원일수가 높은 국가에 속한다. 재원일수 증가는 진료비 상승의 주요 원인이므로, 허혈성 심장질환의 재원일수 관리방안 마련이 필요하다. 이에 본 연구는 허혈성 심장질환자의 재원일수에 영향을 미치는 요인을 파악하여 재원 일수 관리에 필요한 기초자료를 제공하고자 시도되었다. 연구대상자는 일개 상급종합병원의 2015년1월1일부터 12월31일까지 순환기내과의 퇴원환자 중에서 주진단명이 허혈성 심장질환인 환자 566명이다. 자료분석은 IBM SPSS ver. 23.0을 이용하여 빈도분석, 교착분석, Fisher's test, One-way ANOVA, $Scheff{\acute{e}}$ test, 더미변수를 이용한 다중회귀분석을 실시하였다. 연구결과는 첫째, 흉통을 주호소로 입원한 환자가 가장 많았다. 둘째, 평균 재원일수는 4.89일이었으며, 허혈성 심장질환 종류별로 재원일수에 차이가 있었다. 셋째, 75세이상, 당뇨병, 호흡곤란 증상이 재원일수를 증가시키는 요인으로 나타났다. 따라서 허혈성 심장질환의 적정 재원일수 관리를 위해서는 당뇨병을 동반한 허혈성 심장질환자의 경우에는 혈당조절을 통해서 질병의 진행을 막는 것이 중요하며, 증상이 나타났을 경우 빠른 시간 내에 의료기관을 방문할 수 있는 체계마련이 필요하다.