• Title/Summary/Keyword: 혈관확장

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A Study on the Blood Flow Characteristics in the Abodminal Aortic Aneurysm (대동맥류 내부 혈류 유동 특성에 관한 연구)

  • 오태헌;김상욱;이계한
    • Journal of Biomedical Engineering Research
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    • v.20 no.5
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    • pp.601-608
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    • 1999

  • 동맥의 일부분의 팽창하는 동맥류는 높은 사망률을 야기하는 혈관계 질환이다. 동맥류의 발생 및 파열에는 동맥류 내부의 혈류의 유동에 의한 혈관벽 전단 응력 및 압력이 주용한 원인 중 하나로 의심되고 있다. 복부대동맥류 내부의 혈류 유동 특성을 밝히기 위해서 동맥류의 최대 확장부가 복부동맥의 1.5배, 2배인 유리 모델을 제작하였다. 정상류 상태에서 다양한 레이놀즈수에 대해서 속도 및 난동도를 입자영상속도계를 이용하여 측정하였다. 경계층 박리로 인한 재순환 부분이 끝나는 재부착점은 동맥류 최대 확장부 후부에서 발생하였으며, 이 위치는 레이놀즈수의 변화에 따라 바뀌었다. 축방향 속도의 난동은 최대 확장부 후부에서 크게 나타났으며, 이 위치에서 난동에 의한 부가적 응력이 크며 혈관벽 구조변화가 발생하리라 예측된다. 동맥류 내부의 압력분포는 수치해석에 의해 계산되었다. 동맥류 내부 압력은 크기가 증가함에 따라 커졌으며 압력은 동맥류 최대 확장부 후부에서 발생하는 재부착점에서 최대값을 나타내었다. 동맥류 최대확장부 후부는 압력이 최대값을 가지며, 전단력의 변화 및 난동이 큰 지역이므로 동맥류의 파열이 발생하기 쉬운 지역으로 예측된다.

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Intravenous Leiomyomatosis Extending into Right Ventricle Association with Pulmonary Metastasis (폐전이를 동반한 우심실까지 확장된 정맥내 평활근종증)

  • 이해영;조봉균;김종인;변정훈;천봉권;조성래
    • Journal of Chest Surgery
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    • v.37 no.11
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    • pp.933-936
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    • 2004

  • Intravenous leiomyomatosis is a rare disease entity of benign smooth muscle invading into the lumen of veins. We describe a case of intravenous leiomyomatosis originating from the uterus, growing in the inferior vena cava, and extending into the right ventricle association with multiple pulmonary metastasis. A 53-year-old woman with chest discomfort and several times attacks of syncope was treated at our hospital. The tumor was successfully removed with moderate hypothermic cardiopulmonary bypass after total hysterectomy with a bilateral salphingo-oophorectomy, and multiple pulmonary metastasis under simultaneous sternotomy and laparotomy was confirmed.

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A New Technique of Angioplasty of the Left Pulmonary Artery Using an Autologous Main Pulmonary Artery Flap (활로 4징 환자에서 자가 주폐동맥 플랩을 이용한 새로운 좌폐동맥 성형술)

  • 이창하;전양빈;이택연;이석기;백만종;김수철;이영탁
    • Journal of Chest Surgery
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    • v.36 no.4
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    • pp.255-260
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    • 2003

  • Background: Stenosis of the left pulmonary artery (LPA) after repair of tetralogy of Fallot (TOF) is troublesome. A new technique of LPA angioplasty using an autologous MPA flap was performed in patients with TOF Material and Method: From October 1998 to January 2001, 24 patients (median age; 10 months, range; 4 to 145 months) underwent total correction of TOF with LPA angioplasty using the autologous MPA flap. Five patients underwent pulmonary angioplasty without any patch over the MPA and LPA. The patches were required to enlarge only the MPA in 4 patients, and transannular RVOT widening was performed in 15. Result: There were no operative or late deaths. During follow-up (range: 6~42 months), reoperation for LPA stenosis was not required in any patients, but balloon angioplasty for branch pulmonary artery stenosis was performed in 3 patients. Echocardiography and CT angiography at the recent follow-up showed an obtuse angle between the MPA and LPA. Conclusion: Although further follow-up is needed, the angioplasty using the autologous MPA flap can be easily performed, avoiding patch-related complications, and allowing growth of the MPA flap. This angioplasty technique creates a more natural and obtuse angle between the MPA and LPA, which can minimize kinking of the LPA, especially in the patients who underwent transannular patch widening.

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Electron Microscopic Observations of the Vascular Endothelial Cells in the Central Nervous System of Piglets Infected with Porcine Enterovirus Serotype 3 (Porcine Enterovirus 감염자돈(感染仔豚)의 중추신경계(中樞神經系) 혈관내피세포(血管內皮細胞)의 전자현미경적(電子顯微鏡的) 관찰(觀察))

  • Shin, Tae-kyun;Lee, Cha-soo
    • Korean Journal of Veterinary Research
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    • v.28 no.1
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    • pp.137-143
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    • 1988

  • In the course of studying porcine enterovirus infection in piglets, the vascular endothelial cells in the CNS of colostrum-deprived piglets with polioence-phalomyelitis were investigated by electron microscope. The experimental piglets were orally infected with the porcine enterovirus serogroup 3 isolated in Korea and necropsied at 7 days postinoculation. Crystalline arrays of viral particles were found in the vascular endothelial cells of the spinal cord and cerebellum. Aggregates of immature viral particles were occasionally observed in the vascular endothelial cells in the meninges. The rough ER was deprived of ribosomes, irregularly dilated and associated with viral crystals, There were abundant cytoplasmic filaments, dilatation of perivascular space, perivascular cuffing, and the partial distruptions of endothelial cell membrane and basal lamina.

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