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図書 |
図書
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五十嵐朗[著]
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その他 |
その他
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五十嵐, 朗 ; Igarashi, Akira
概要:
取得学位：博士(工学)，学位授与番号：博甲第1127号，学位授与年月日：平成21年3月43日
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論文 |
論文
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山越, 健弘 ; 松村, 健太 ; 花木, 翔太 ; 五十嵐, 朗 ; Rolfe, Peter ; 李, 知炯 ; 山越, 康弘 ; 廣瀬, 元 ; 山越, 憲一
概要:
The long term goal of our research is to develop an in-car health screening instrument, based on a novel approach for physiological measurement, in order to contribute to much-needed efforts aimed at achieving safer driving. We describe
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here a feasibility study in which a system was constructed to derive cardiac indices non-invasively and simultaneously using a finger cuff. Specifically, the instrument measures blood pressure (BP), pulse rate (PR), normalized pulse volume (NPV) reflecting alpha-adrenergic sympathetic activity, and finger-artery elasticity index (FEI). The instrument's measurement process has two phases:firstly, cuff pressure is maintained at 30 mmHg to measure the NPV and PR;secondly, whilst applying a gradual change in counter-pressure, the BP and FEI are measured by application of the volume-oscillometric method. We tested a prototype instrument in 5 healthy male and female volunteers (age 21, 22, 36, 37, 49 years) during two weeks day-to-day living, including a 33-hour period of total sleep deprivation as physiological challenge. The results indicated that with sleep deprivation there appear to be relatively large physiological changes. In conclusion, the prototype system we have developed has allowed the periodic collection of physiological data in a convenient and expeditious way without any failure, demonstrating the possibility to detect an adverse effect on health. Further investigations will be needed in a larger group of subjects with a variety of real environmental conditions.
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論文 |
論文
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五十嵐, 朗 ; 野川, 雅道 ; 山越, 健弘 ; 本井, 幸介 ; 田中, 志信 ; 山越, 憲一
概要:
Electrical impedance (or admittance) cardiography is a simple and still potential method for non-invasive and continuous
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monitoring of stroke volume and cardiac output (CO) by detecting the electrical impedance of a thorax which is roughly assumed to be a two-compartment coaxial cylindrical model composed of the aorta and its surrounding thoracic tissues. Although the band-electrode method proposed by Kubicek et al. has been widely used for the detection of the electrical impedance, long-term use of the band-electrodes is often uncomfortable and causes inflammation of the skin. Replacement of band-electrodes with spot-electrodes is therefore highly required for clinical practice. We have previously investigated an optimal spot-electrodes array from such a view point, and reported these results in this journal. However, the current distribution during cardiac blood ejection period showed little uniformity, and detailed investigation of this phenomenon was remained as a future problem. The present study concerns with this problem through the analysis of pulsatile components of the thoracic impedance along the medial line of the thorax by a finite element method and those by actual measurement. From these investigations, an optimal electrodes-location for voltage pick-up was to be determined as the medial portion at the level of the clavicle and the portion above the xiphisternum. Furthermore, we have investigated the accuracy of CO measurement using impedance cardiography by the new spot-electrode array to that using a pulse dye-densitometry method. From the CO comparison experiments, bias and precision calculated for the impedance cardiography versus a pulse dye-densitometry method averaged -0.43±1.42L/min, the validity and reasonable accuracy of the new spot-electrodes array was clearly demonstrated.
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論文 |
論文
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高山, 浩司 ; 石崎, 彩 ; 五十嵐, 朗 ; 田中, 志信 ; 山越, 憲一
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図書 |
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次世代センサ協議会編 ; 小林彬 [ほか] 共著
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