著者

山本 匡 岩崎 清隆 新井 淳 北原 茂実 梅津 光生

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.51, no.6, pp.350-356, 2013-12-10 (Released:2014-03-28)

参考文献数

11

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Percutaneous coronary intervention (PCI) for ischemic heart disease became a common therapy. The improvement of treatment results was caused by invention of drug-eluting stent (DES) but its implantation procedure for pressure and inflation time has not been discussed. 3-time-balloon-inflation method is proved to be an effective method for inflation in in vitro experiments and it was practiced in the clinical field. The purpose of this study is to determine the effectiveness of the 3-time-balloon-inflation method and investigate the factors that cause suppression of stent expansion. From January 2011 to March 2012, PCI with drug-eluting stent (XIENCE V) were performed to 169 patients by a single-operator with 3-time-ballon-inflation method. Minimal lumen area (MLA), vessel cross-sectional area, and plaque cross-section in the MLA were measured by intravascular ultrasound (IVUS) before stent implantation. Minimum stent area (MSA) was measured after stent implantation. Stent expansion ratio (SER) was calculated from assumed area and MSA. Area acquisition ratio (AAR) was calculated from MSA and MLA. Subsequently, the ratio of calcification in the lesion was measured using the color mapping function mounted on the IVUS. The stent diameter used in this study was 2.89±0.35[mm] (mean±SD), stent length was 20.5±6.2[mm] (mean±SD), and the stent expansion pressure was 10.3±2.4[atm] (mean±SD). There was no difference in SER by stent size, target vessels, and MLA. Significant difference was seen in the calcification ratio between the group without pre-dilatation (n=27) and the group with pre-dilatation (n=142), but no difference in SER between the two groups. It was suggested that calcification ratio is one of the factors that causes the suppression of stent expansion because significance of calcification ratio came out in AAR.

著者

狩野 奈々 北原 茂 平野 慶二

雑誌

長崎県水産試験場研究報告 (ISSN:03888401)

巻号頁・発行日

no.37, pp.7-10, 2011-12

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2009年7月に有明海,橘湾や八代海において,Chattonella赤潮が広範囲かつ高密度に発生し,養殖魚類で甚大な被害が発生した。長崎県海域ではハマチ,ヒラマサ等約25万尾,約4億3千万円と本県で歴代2位となる漁業被害が発生した。熊本県では約8億7千万円,鹿児島県では約20億3千万円の漁業被害が発生し,3県の被害総額は約33億円であった。赤潮等を対象とした漁場環境のモニタリング調査は定点観測が主体で行われており,モニタリング調査の充実は赤潮対策を検討する上で重要な役割を果たしている。赤潮の挙動を正確に把握するためには,調査定点数や調査頻度を増やす必要があるが,時間的制約や人的制約を受け困難な状況にある。そこで,詳細な観測データが得られる多項目水質計とGPSロガーを併用し,連続的にデータを取得できる走行型の水質連続観測について,通常の定点観測と並行して2010年7月20日に橘湾で行った調査事例を挙げ,それぞれの水質結果から水平分布図を作成し検証したので紹介する。