| Japanese |
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| Title | 気管内心機図 |
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| Subtitle | |
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| Authors | 津崎晃一, 長野政雄 |
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| Authors(kana) | |
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| Organization | 慶応義塾大学医学部麻酔学教室 |
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| Journal | 循環制御 |
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| Volume | 8 |
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| Number | 1 |
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| Page | 83-87 |
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| Year/Month | 1987/ |
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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 | 心拍動に伴う気管内における気体の圧, および流量変化波形（気管内心機図）からそれぞれ心機能と密接に結び付いていると考えられるパラメータを抽出し, 心エコー法による心機能評価と比較した. 圧変化波形からは弁開閉に基づくと考えられる棘波間隔より心収縮時相を求め, 心エコー法による心収縮時相と比較した結果, 前駆出時期, 左室駆出時間においてそれぞれ良好な相関（r＝0.82, 0.93）を得た. また流量変化波形からは心収縮力を反映すると考えられるパラメータとして, 心収縮に引き続き起こる吸気方向の流速変化およびその最大微分値を求め, 同様に心エコー法による心筋短縮率および平均円周短縮速度と比較した結果, 心収縮力をよりよく示す平均円周短縮速度とは, 流速変化より, 最大微分値のほうが良好な相関（r=0.46, 0.71）を認めた. また, これらに加えて, 気管内心電図の発生機序に及ぼす肺動脈拍動の影響について併せて検討を加えた. |
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| Practice | 基礎医学・関連科学 |
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| Keywords | |
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| English |
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| Title | Intratracheal pneumocardiogram |
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| Subtitle | |
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| Authors | Koichi Tsuzaki, Masao Nagano |
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| Authors(kana) | |
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| Organization | Department of Anesthesiology, School of Medicine, Keio University |
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| Journal | Circulation Control |
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| Volume | 8 |
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| Number | 1 |
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| Page | 83-87 |
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| Year/Month | 1987/ |
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| Article | Original article |
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| Publisher | Japan Society of Circulation Control |
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| Abstract | The oscillatory air movements in the trachea concomitant with the heart beat is called as the cardiogenic oscillations. We have measured these air movements by high−gain pressure transducer and pneumotachograph that attached to the proximal side of the endotracheal tube in series during apnea. From the standpoint of its application to the noninvasive monitoring of cardiac function, we have named these phasic pressure and flow changes as an intratracheal pneumocardiogram （abbreviated as ITCG−P and ITCG−F, respectively）. Present study shows that the systolic time intervals （STIs） derived from the spike waves of ITCG−P, which synchronized with the cardiac valvular motion, correlate well with the STIs by echocardiography （r＝0.82, 0.93 for PEP and LVET, respectively）. On the other hand, the contractile parameters derived from ITCG−F do not correlate so good with the echocardiographic assessment of the cardiac function except for the correlation between the maximum differential value of ITCG−F （max dF／dt） and mean Vcf（r＝0.71）. |
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| Practice | Basic medicine |
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| Keywords | intratracheal pneumocardiogram, echocardiography, cardiac function, systolic time intervals |
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