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뇌졸중 최신지견 2009: 뇌졸중의 급성기 치료 및 이차예방
권순억 대한뇌졸중학회 2010 Journal of stroke Vol.12 No.1
There were several positive clinical trials with new anticoagulants and antiplatelet agents which will affect on the guideline of the secondary stroke prevention. Dabigatran, an oral direct thrombin inihibitor, had better clinical outcomes than warfarin in the prevention of cardiovascular events in the patients with atrial fibrillation. Ticagrelor and prasugrel are new antiplatelet agents. They successfully reduced cardiovascular events after acute myocardial infarction without increase bleeding complications compared to clopidogrel. The effects of platelet inhibition of those thienopyridine antiplatelet agents were influenced by the usage of proton pump inhibitor owever, there are no direct supporting evidences to avoid concomitant use of prohibition of proton pump inhibitors and thienopyridines. Genetic polymorphisms of cytochrome P450 2C19, which affects on the metabolism of thienopyridines, affect on the antiplatelet effects of thienopyridines and clinical outcomes. One small clinical trial showed that niacin was better in the prevention of progression of intima-medial thickness of common carotid artery than ezetimibe.
권순억,박노열,김준오,정태건,Gwon, Sun-Eok,Park, No-Yeol,Kim, Jun-O,Jeong, Tae-Geon 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.12
We obtain the mathematical model of the hard disk drive actuator system the system response data of the finite element analysis or experimental results. The model is base on the Rayleigh-Ritz method to approximate the dynamic response of the actuator system. The basic idea is to use the curve-fit technique to obtain the approximation coefficients. It allows the dynamic analysis of the actuator system without resort to the repetitive finite element modeling work. Even though the dynamic characteristics of the system of the system are affected somewhat by the structural modification and the change of the material properties, we can use the modified size and dynamic properties of the actuator system in the mathematical model to some extent. In this study, we express the mathematical model of the simplified rectangular plate first and then proceed to the actual hard disk drive actuator system.
권순억 대한뇌졸중학회 2001 Journal of stroke Vol.3 No.1
혈관 폐색의 유무나 폐색된 부위를 밝히는 것은 뇌경색의 기전,이차예방을 위한 치료전략의 수립,뇌졸중의 예후를 평가하는데 도움이 될 뿐만 아니라 혈전용해술을 시행하는데도 도움이 된다.이런 면에서 TCD는 값싸고 비침습적이며 현장에서 바로 진단을 내릴 수 있는 장점이 있어서 뇌혈관질환의 screening을 위해서 많이 이용되고 있다.최근에는 기술의 발전으로 MR angiography가 혈관의 상태를 비교적 정확하게 보여주고 시간이나 비용면에서도 크게 개선되어서 뇌혈관 질환의 평가에 널리 이용되고 있으나,혈류의 방향이나 collateral flow의 형성 등에 관한 정보는 얻을 수 없다.MR angiogram의 단점인 혈류의 방향과collateral flow에 대한 정보는 T C D를 이용하면 정확한 정보를 얻을 수 있으므로,TCD는 MR angiogram과 보완적으로 이용될 때 뇌혈관 질환을 진단하고 치료방침을 결정하는데 큰 도움이 될 수 있다.그러나 TCD는 혈관의 형태나 혈관 내경에 대한 직접적인 소견을 얻는 것이 아니라 혈류 속도와 파형의 변화를 이용해서 뇌혈관 질환의 유무를 판단하여야 하므로 민감도 (sensitivity)와 특이도(specificity)가 떨어지므로, TCD 소견만으로 이들 혈관질환의 진단을 하기는 어렵다. 그러므로 혈관의 폐색이나 협착이 있을 때 관찰될 수 있는 TCD의 일반적 소견에 대한 많은 연구들이 이뤄졌으며,이들 연구들을 통해서 임상에서 다양한 TCD소견을 접했을 때,좀 더 정확하게 혈관 질환을 진단할 수 있게 되었다.이글에서는 이런 소견들을 소개하여 TCD를 이용하는 사람들이 좀더 정확한 진단을 할 수 있도록 하고자 한다. (Korean Journal of Stroke 2001;3(1): 14~20
권순억 대한뇌졸중학회 2000 Journal of stroke Vol.2 No.1
Background and Purpose : The natural history of intracranial arterial stenoses remains unknown. To investigate the natural course of the stenoses in the intracranial cerebral arteries and the possible role of clinical prognostic factors, we conducted a prospective study using transcranial Doppler (TCD)ultrasonography. Methods : We performed TCD study on 83 stroke patients with angiographically documented stenosis of middle cerebral artery (MCA) or basilar artery (BA). The findings were compared to repeat TCD studies conducted more than 2 months apart with respect to changes in mean flow velocities (mFV) of the stenotic segment. We analyzed the clinical data of all patients including risk factors of atherosclerosis, electrocardiogram, echocardiogram, and patterns of stenosis, which may affect the natural history of arterial stenosis. Results : Ninety seven arteries (47 left MCA, 31 right MCA, and 19 BA) from 83 patients (65 men and 18 women; mean age 56.6 years) were serially examined. During a mean follow-up period of 364 days, 23 (23.7%) arteries had TCD evidence of stenosis progression and 26 (26.8%) showed stenosis regression. BAs more often showed stenosis regression than did MCAs (p〈0.05), and arteries with symptomatic stenosis more often regressed than those not causing neurological symptoms (p〈0.05). Age, sex, or any risk factors of atherosclerosis were not associated with the course of the stenosis. Conclusion : These findings suggest that stenoses of intracranial arteries are dynamically changed, and that they may progress or regress within a relatively short period of time. Atherosclerotic risk factors are not related to the progression or regression of the stenoses whereas symptomatic (versus asymptomatic) stenosis and BA (versus MCA) involvement are factors related to regression of the stenosis. Korean Journal of Stroke 2000;2(1): 53~56