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Lower Extremity Arterial Bypass with Arm Vein Conduits and Literature Review
박대준,박양진,윤경원,Seon-Hee Heo,김동익,김영욱 대한혈관외과학회 2016 Vascular Specialist International Vol.32 No.4
Purpose: The superiority of autogenous vein conduits is well known in lower extremity arterial bypass (LEAB). Among various alternative conduits for LEAB, long-term results of arm vein grafts were investigated in this study.Materials and Methods: We retrospectively reviewed clinical characteristics of 28 patients who underwent infrainguinal LEAB with autogenous arm vein grafts at a single institute between January 2003 and December 2015. All procedures were performed in the absence of adequate saphenous veins. Graft patency was determined by periodic examinations with duplex ultrasonography. Results: Autologous arm vein grafts were implanted for 28 patients (mean age, 60.4±16.8 years; range, 20-82 years; male, 92.9%; atherosclerosis, 19 [67.9%]; and non-atherosclerotic disease 9 [32.1%] including 5 patients with Buerger’s disease). Source of arm vein were basilic 13 (46.4%), cephalic 4 (14.3%) and composition graft with other veins in 11 (39.3%) cases. The level of distal anastomosis was distributed as popliteal in 5 (17.9%), tibio-peroneal in 21 (75.0%) and infra-malleolar artery in 2 (7.1%) cases. Mean duration of follow-up was 41.5±46.9 months (range, 1-138 months). Cumulative primary patency rates at 1, 3, and 5 years were 66.5%, 60.9% and 60.9%, respectively. Assisted-primary patency rates at 1, 3 and 5 years were 66.5%, 66.5% and 66.5%, respectively. Secondary patency rates at 1, 3 and 5 years were 70.8%, 70.8% and 70.8%, respectively. There was one limb amputation during the follow-up period.Conclusion: Arm veins are a useful alternative conduit when great saphenous veins are not available during LEAB.
완비부분순서집합에서 정의된 단조함수의 최소고정점을 구하는 방법
박대준,이광근 한국정보과학회 프로그래밍언어연구회 2006 프로그래밍언어논문지 Vol.20 No.1
이 글은 완비부분순서집합(CPO)에서 정의된 단조함수(monotone)의 최소고정점을 구하는 방법을 제시한다. 지금까지 최소고정점을 구하는 방법에 따른 조건들은 이보다 제약이 더 많았다. 그것은 완비부분순서집합에서 정의된 연속함수(continuous)이거나 완비격자(complete lattice)에서 정의된 단조함수(monotone)라는 조건이다. 이글에서는 지금까지 제시된 방법 중 가장 적은 제약조건하에서의 최소고정점을 다룬다.