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Your search keyword '"INO-OKA, EIJI"' showing total 35 results
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35 results on '"INO-OKA, EIJI"'

17. Attempt of Quantitative Analysis of Visual Evaluation for 123I-BMIPP Myocardial Scintigraphy Images.

Author

Ino-Oka, Eiji, Chiba, Satomi, Urae, Jun, Sekino, Makoto, Satoh, Masatsugu, Takeuchi, Kazuhisa, Sekino, Hiroshi, Kajikawa, Shinya, and Inooka, Hikaru

Abstract

We developed a new technique to quantitatively analyze visual evaluation single photon emission computed tomography (SPECT). Short axis tomograms and color scales were computer scanned. The scales were divided into 25 parts; numbers of each hue pixel were scored 0-100%. Short-axis images were divided into eight equal partitions, numbers of hue pixels distributed in each partition were scored, and total scores were obtained. Each partition's radio-isotope (RI) accumulation index was calculated as partition score/highest score. For method validation, scintigrams from each left ventricular phantom part were divided into eight partitions and filled with 123I-BMPP (10-100%). The error between theoretical and calculated concentrations was within 20% in the concentration range of ≥50%, suggesting a good correlation and indicating the method's validity. [ABSTRACT FROM AUTHOR]

Published
2011
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20. Effects of changes in afterload impedance on left ventricular ejection in isolated canine hearts: dissociation of end ejection from end systole.

Author

NISHIOKA, OSAMU, MARUYAMA, YUKIO, ASHIKAWA, KOUICHI, ISOYAMA, SHOGEN, SATOH, SHOICHI, SUZUKI, HIDEYUKI, WATANABE, JUN, WATANABE, HAJIME, SHIMIZU, YOSHIO, INO-OKA, EIJI, and TAKISHIMA, TAMOTSU

Abstract

To examine how end systole differs from end ejection and also whether the slope of the end systolic pressure-volume relation can be approximated to that of the end ejection pressure-volume relation, nine isolated, perfused, paced canine hearts ejecting into a hydraulic loading system that simulated the aortic input impedance of a dog's arterial tree were studied. To measure left ventricular volume changes the heart was placed in a plethysmograph. Peripheral resistance (Rp) and arterial compliance (C) were independently varied from 1.9 (Rp=1.9) to 3.3, 6.4, and 9.6 × 108 Pa·m−3·s (Rp run) with a constant value of compliance 1.3 × 10−9 Pa−1·m3 (C=1.3), and from C=0.4 to C=0.8, C=1.3 and C=2.3 (C run) with a constant value of resistance (Rp=6.4). Five pressure-volume loops were obtained by changing the end diastolic volume at each value of compliance and peripheral resistance. It was clearly shown that ventricular ejection continued after end systole and the time duration between end systole and end ejection became longer with increasing arterial compliance (24(4) at C=0.4 vs 49(4) ms at C=2.3, p<0.001), while the time duration between end diastole and end systole was constant regardless of afterload impedance change. Regarding the left ventricular pressure-volume relation the end systolic relation was almost linear (r≥0.98) and the slope was not significantly affected by change in any afterload impedance tested. End ejection pressure-volume relation was also linear (r≥0.97) and the slopes in the peripheral resistance and compliance runs were lower than those of the end systolic pressure-volume relation in each corresponding run. The former slopes decreased at smaller values of Rp or larger values of C — namely, 4.4(0.6) at Rp=9.6 vs 3.6(0.6) at Rp=1.9, p<0.05; 4.8(0.6) at C=0.4 vs 3.1(0.5) mm·Hg·ml−1 at C=2.3, p<0.001. Thus it is concluded that end ejection is usually different from end systole and the time difference between them is affected by changes in arterial compliance. In addition, the slope of end ejection pressure-volume relation was dependent on the changes in afterload impedance and cannot be approximated to that of the end systolic pressure-volume relation. [ABSTRACT FROM PUBLISHER]

Published
1987

21. Effects of changes in the aortic input impedance on systolic pressure-ejected volume relationships in the isolated supported canine left ventricle.

Author

ISHIDE, NOBUMASA, SHIMIZU, YOSHIO, MARUYAMA, YUKIO, KOIWA, YOSHIRO, NUNOKAWA, TOORU, ISOYAMA, SHOGEN, KITAOKA, SHIGENORI, TAMAKI, KENJI, INO-OKA, EIJI, and TAKISHIMA, TAMOTSU

Abstract

We examined the effects of aortic input impedance alteration on left ventricular pressure, aortic flow and ejected volume (integral value of aortic flow), in an isolated blood perfused ejecting canine heart, with special reference to end-systolic values. A hydraulic model which stimulates an aortic input impedance was attached to the aortic root of an excised heart. Left ventricular end-diastolic pressure was kept constant by electrical pacing. Three coronary arteries were perfused with arterial blood from support dogs. When the peripheral resistance in the hydraulic model was changed, there were inverse linear relationships between stroke volume and mean left ventricular systolic pressure and between ejected volume and pressure at end-systole. Time interval from the onset of contraction to end-systole did not change. Thus the relation between stroke volume and mean left ventricular pressure obtained by changes in peripheral resistance is governed by a source resistance, which can be considered as the contractile state of the ventricle. When the capacitance (arterial compliance) was changed, there was no inverse linear relation between stroke volume and mean systolic pressure. In many cases, there was an inverse linear relationship between ejected volume and pressure at end-systole. However, an increase in capacitance prolonged the time interval from the onset of contraction to end-systole. We conclude that the end-systolic pressure-ejected volume relationship in the ejecting heart is governed not only by contractility but also by arterial capacitance. [ABSTRACT FROM PUBLISHER]

Published
1980

27. Effects of preload alteration on the degree of ischemia and function of ischemic myocardium under constant mean aortic pressure, coronary perfusion pressure and heart rate in isolated perfused canine heart.

Author

SATOH, Shoichi, primary, MARUYAMA, Yukio, additional, ASHIKAWA, Kouichi, additional, ISOYAMA, Shogen, additional, SUZUKI, Hideyuki, additional, WATANABE, Jun, additional, NISHIOKA, Osamu, additional, INO-OKA, Eiji, additional, and TAKISHIMA, Tamotsu, additional

Published
1986
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28. A high-pass phaseless filter for eliminating low-frequency ECG noise during exercise and its clinical application to automatic analysis of the heart rate and ST segment level.

Author

INO-OKA, EIJI, primary, ISOYAMA, SHOGEN, additional, SHIMIZU, YOSHIO, additional, SATO, SHOICHI, additional, TAMAKI, KENJI, additional, KITAOKA, SHIGENORI, additional, ISHIDE, NOBUMASA, additional, TAKISHIMA, TAMOTSU, additional, MATSUO, TADAYUKI, additional, and TAKAHASHI, KORO, additional

Published
1984
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34. ST segment changes under occlusion of the proximal portion of major coronary arteries in the isolated canine heart.

Author

KITAOKA, Shigenori, primary, INO-OKA, Eiji, additional, MARUYAMA, Yukio, additional, ASHIKAWA, Kouichi, additional, KOIWA, Yoshiro, additional, NUNOKAWA, Tooru, additional, ISHIDE, Nobumasa, additional, ISOYAMA, Shogen, additional, TAMAKI, Kenji, additional, SATO, Shoichi, additional, SUZUKI, Hideyuki, additional, SHIMIZU, Yoshio, additional, and TAKISHIMA, Tamotsu, additional

Published
1985
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