| Japanese |
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| Title | カテーテルを挿入したまま動脈圧測定系の伝搬特性の良否を測定する |
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| Subtitle | 原著 |
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| Authors | 杵淵嘉夫, 福山東雄, 斉藤聡, 金沢正浩, 滝口守 |
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| Organization | 東海大学医学部外科学系麻酔科学部門 |
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| Journal | 循環制御 |
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| Volume | 23 |
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| Number | 1 |
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| Page | 24-30 |
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| Year/Month | 2002/ |
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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 | 肺動脈カテーテルを挿入したまま, 血圧波形の伝搬特性を測定する新しい方法と臨床への応用結果について述べる. カテーテルの手元の部分を軽く叩いて圧波形に減衰振動を重畳させ, 振動の周波数と減衰の時定数を計測し, 伝搬特性の2つのパラメータである固有周波数（fn）と制動係数（ζ）を算出する. 実験室で, カテーテルの周波数特性を測定した結果と比較することによってこの方法が正しいことを確認した. カテーテルを患者に挿入した状態で本法を施行し, 伝搬特性がfn=13.4Hz, ζ=0.22前後まで劣化していることが明らかになった. これらの伝搬特性下では低い周波数の共振振動が起こりやすく, 血圧値に誤差を生じる懸念があった. |
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| Practice | 基礎医学・関連科学 |
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| Keywords | Tapping method, Natural frequency, Damping coefficient and Frequency characteristics |
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| English |
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| Title | Evaluation of Pulmonary Artery Pressure Waveforms Using a Catheter-manometer System in Clinical Use |
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| Authors | Yoshio Kinefuchi, Haruo Fukuyama, Satoru Saitoh, Masahiro Kanazawa, Mamoru Takiguchi |
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| Authors(kana) | |
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| Organization | Department of Anesthesiology, Tokai University School of Medicine |
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| Journal | Circulation Control |
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| Volume | 23 |
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| Number | 1 |
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| Page | 24-30 |
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| Year/Month | 2002/ |
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| Article | Original article |
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| Publisher | Japan Society of Circulation Control |
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| Abstract | To quantitatively evaluate the frequency characteristics of a pulmonary artery catheter-manometer system in clinical use, we worked out the new technique as follows. By tapping slightly the catheter at a part wherever it's convenient, a damped oscillation was created on a pressure waveform. By measuring the frequency （or period） and the damping time constant （or the settling time） of the oscillation, the natural frequency （fn） and the damping coefficient （zeta） could be calculated. This technique is referred to as the tapping method. By plotting fh and zeta on the fn-zeta chart, which we have reported previously, we could evaluate the fidelity of the pressure waveform through a catherter in clinical use. We obtained the results that pressure waveforms observed in clinical condition were distorted to 13.4 Hz of fn and 0.22 of zeta, and to 3.0 Hz of fh, which meant the highest frequency the system could derive without distortion. There remained a significout concern about the pressure values to be misread due to a low frequency oscillatory resonance. |
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| Practice | Basic medicine |
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| Keywords | Tapping method, Natural frequency, Damping coefficient and Frequency characteristics |
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