| Japanese |
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| Title | PAC(pulmonary artery catheter)の周波数特性の限界 |
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| Subtitle | 原著 |
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| Authors | 杵渕嘉夫*, 鈴木利保*, 竹山和秀*, 山崎陽之介*, 山本道雄* |
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| Organization | *東海大学医学部麻酔科 |
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| Journal | 循環制御 |
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| Volume | 13 |
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| Number | 1 |
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| Page | 89-95 |
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| Year/Month | 1992/ |
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| Article | 原著 |
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| Publisher | 日本循環制御医学会 |
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| Abstract | 「要旨」脱気した乳酸加リンゲル液中でPAC(pulmonary artery catheter)を用いた圧導出系の周波数特性を実測すると, 標準的なPAC(7Fr, 4ルーメン, 有効長110cm)の固有周波数と制動係数はそれぞれ28.5〜41.2Hz, 0.16〜2.2となり, 通常の臨床手順で組み立てた系と比較すると固有周波数は2〜3倍以上, 制動係数は同程度に低下する特性が得られた. 供給元の公称値やPACの諸元から求めた計算値とも概ね合致し, 限界周波数特性と考えられる. PACの限界周波数特性は同じ条件下ではルーメンの構造に依存し, 肉厚で円形のルーメン構造が薄い隔壁で分割された扇形のルーメン構造より優れた周波数特性を示した. 5ルーメンと2ルーメンのPACの限界周波数特性は上記の標準的なPACより劣り, 同じ理由によると推定された. また, 限界周波数特性は材質にも依存し, ポリ塩化ビニール製がポリウレタン製より優れた特性を示した. 市販の制動素子は限界周波数特性に対して, 固有周波数をやや低下させるが, 良好な制動効果を示した. 延長チューブの付加と空気の注入によって固有周波数と制動係数はともに劣化し, 臨床使用状態が再現された. 臨床使用下での限界周波数特性の実現が今後の課題である. |
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| Practice | 基礎医学・関連科学 |
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| English |
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| Title | The limits of the frequency characteristics of PACs (pulmonary artery catheters) |
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| Authors | Yoshio Kinefuchi, Toshiyasu Suzuki, Kazuhide Takeyama, Yonosuke Yamasaki, Michio Yamamoto |
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| Organization | Department of Anesthesiology School of Medicine TOKAI University |
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| Journal | Circulation Control |
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| Volume | 13 |
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| Number | 1 |
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| Page | 89-95 |
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| Year/Month | 1992/ |
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| Article | Original article |
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| Publisher | Japan Society of Circulation Control |
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| Abstract | Measurement of the frequency characteristics of the fluid-filled catheter-manometer system in a deaerated lactated Ringer's solution has revealed that a conventional PAC (7 Fr ; 4 lumina ; length, 110 cm) has natural frequency of 28.5-41.2 Hz, and a damping coefficient of 0.16-2.2. In other words, the natural frequency is higher by 2-3 times or eben more than a system assembled by the conventional clinical procedure, while the damping coefficient is reduced in a similar degree to the latter. These values are mostly consistent with the claimed specifications by the manufacturers and also with the values calculated from dimensions of the PAC ; hence, the values obtained are presumably the limits of the frequency characteristics. The limits of the frequency characteristics is related to the structure of the lumen, and the structure of a thick-wall and a circular cross section proved to have a better frequency characteristics than that of radial cross section partitioned wirh thin walls. The limits of the frequency characteristics further proved to be related to the materials used, and the PACs made of polyvinyl chloride were found to be superior to those Made of polyurethane. The damping devices commercially available proved to exert a satisfactory damping effect, although they lowered the natural frequency slightly. Fitting with an extension tubing and infusion of air have worsend both the natural frequency and the damping coefficient. |
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| Practice | Basic medicine |
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