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홍경표,조성신,조진현 대한외과초음파학회 2019 대한외과초음파학회지 Vol.6 No.2
Purpose: Percutaneous transluminal angioplasty (PTA) shows an attractive outcome for treating infrainguinal arterial occlusive disease (IAOD). However, this procedure requires repeated revascularization and additional stenting. Directional atherectomy (DA) has been reported to be a modality that requires less frequent use of stenting. The aim of this study was to compare the duplex-based outcomes between PTA and DA for treating IAOD. Methods: A retrospective review of consecutive patients with IAOD treated with PTA and DA was completed. The demographics and procedural data were obtained. A provisional stent was placed in those cases with flow-limiting dissection and residual stenosis after PTA or DA. Technical success was defined as a residual stenosis < 30%. The primary patency rate was evaluated by performing duplex scanning. The clinical outcomes and frequency of stent placement for each procedure were evaluated. For statistical analysis, the data was analyzed using SPSS 22.0 software (IBM Corp, Chicago, Ill). All P values were considered significant if less than 0.05. Results: Seventy-one patients were included in the study. Their mean age was 71.5 ± 10.2 years. The male-to-female ratio was 49:22. Thirty-three patients underwent PTA. DA was performed in 38 patients (42 limbs). Technical success was achieved in all the patients. The duplex-based clinical outcome and limb salvage rate were similar in the two groups. Bailout stent placement was performed in 8 of 33 patients (24.2%) in the PTA group and in no patient in the DA group. Conclusion: The clinical outcomes were similar for both the DA and primary PTA groups. Atherectomy reduced the need for bailout stent placement as compared with bailout stent placement in primary PTA.
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김영욱,정한준,윤봉호,김신윤,이상국,변경환,김태헌 경북대학교 병원 1997 경북대학교병원의학연구소논문집 Vol.1 No.1
Deep vein thrombosis is recognized as a common complication in surgical patients in western countries especially in patients with high risk factors. The purposes of this study were to detect leg DVTs in early postoperative period by non-invasive surveillance and to analyze the risk factors of DVT. One hundred seventy one patients who underwent major operations(67 curative resection of colorectal cancer, 64 total hip replacement, 38 femur operation for fracture, and 2 colon resections for benign colon disease) were included for the prospective surveillance of leg DVT within 2 weeks after the operations. For the surveillance of leg DVT, strain gauge plethysmography(SPG) and Duplex scanning of both legs were completed for all patients except 10 patients. These 10 patients were examined in only one leg. The patients with past history of leg DVT or under prophylactic anticoagulant therapy were excluded from this study. To determine the risk factors related with leg DVT formation, age and sex of the patients, indication of surgery or surgical procedures, duration of operation, position during the operation, duration of postoperative immobilization, and preoperative serum level of antithrombin III (AT- III) were analyzed using Chi-square test. After performing SPG of 342 legs, 38 legs, showed abnormal on venous outflow/venous capacitance discriminant line chart, and 13 legs of 12 patients showed the finding(s) suggesting DVT on duplex scanning. Among the patients with abnormal duplex findings, 7 limbs(53.8%) were symptomatic, but the remaining 6 legs were silent. In 6 (15.8%) patients of 36 femur operations, 3(4.7%) of 64 total hip replacements and 3(4.5%) of 67 curative resections of colorectal cancer developed DVT by duplex scanning in the iliac(5), femoral-popliteal(6), and isolated calf(2) veins. After analyzing the risk factors, we could not find any statistically significant(p<0.05) factor related with leg DVT.
OCT 시스템을 위한 이중 광경로 지연기와 PZT 광경로 지연기에서의 편광모드분산 및 열요동 보상
김영관,박성진,김용평 경희대학교 레이저공학연구소 2004 레이저공학 Vol.15 No.-
In this study, a duplex scanning optical delay line is implemented and characterized for optical coherence tomography. The reference and sample arms in Michelson interferometer are simultaneously scanned by use of two identical piezoelectric transducers (PZT). It is obtained that scanning range, thermal drift, repeatability, and axial scanning velocity of duplex optical scanning delay line are distinctly superior to those of single scanning optical delay line.
Jeon, Soon-Hyeok,Kim, Soon-Tae,Lee, In-Sung,Park, Joo-Hyun,Kim, Kwang-Tae,Kim, Ji-Soo,Park, Yong-Soo The Japan Institute of Metals 2011 Materials transactions Vol.52 No.3
<P>To elucidate the thermodynamics of inclusion formation and its influence on the corrosion behavior of Cu bearing duplex stainless steels, potentiodynamic and potentiostatic polarization tests, a SEM-EDS analysis of inclusions, and thermodynamic calculations of the formation of inclusions were carried out. While the resistance to general corrosion of the noble copper contained alloy-1.5Cu in a deaerated 2 M H2SO4 was higher than that of the alloy-BASE, the resistance to pitting corrosion of copper contained alloy-1.5Cu in a deaerated 0.5 N HCl + 1N NaCl and 30 mass% NaCl was lower than that of the alloy-BASE due to an increase of interface areas between inclusions and matrix acting as preferential pit initiation sites. The thermodynamic calculation for the formation of Cr-containing oxide inclusions was in good agreement with the experimental results. [doi:10.2320/matertrans.M2010355]</P>