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[in Japanese]
1992 Volume 21 Issue 6 Pages
1397-1398
Published: December 15, 1992
Released on J-STAGE: October 07, 2011
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1399-1407
Published: December 15, 1992
Released on J-STAGE: October 07, 2011
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1408-1409
Published: December 15, 1992
Released on J-STAGE: October 07, 2011
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[in Japanese], [in Japanese]
1992 Volume 21 Issue 6 Pages
1409-1410
Published: December 15, 1992
Released on J-STAGE: October 07, 2011
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1410-1412
Published: December 15, 1992
Released on J-STAGE: October 07, 2011
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[in Japanese], [in Japanese]
1992 Volume 21 Issue 6 Pages
1412-1413
Published: December 15, 1992
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[in Japanese], [in Japanese]
1992 Volume 21 Issue 6 Pages
1413-1414
Published: December 15, 1992
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1414-1415
Published: December 15, 1992
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1416-1417
Published: December 15, 1992
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1417
Published: December 15, 1992
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1418-1419
Published: December 15, 1992
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1419-1420
Published: December 15, 1992
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1420-1421
Published: December 15, 1992
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1421-1422
Published: December 15, 1992
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1422-1423
Published: December 15, 1992
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1423-1424
Published: December 15, 1992
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1424-1426
Published: December 15, 1992
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[in Japanese], [in Japanese]
1992 Volume 21 Issue 6 Pages
1426-1427
Published: December 15, 1992
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1428-1429
Published: December 15, 1992
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[in Japanese], [in Japanese]
1992 Volume 21 Issue 6 Pages
1429-1430
Published: December 15, 1992
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[in Japanese]
1992 Volume 21 Issue 6 Pages
1431-1432
Published: December 15, 1992
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[in Japanese], [in Japanese]
1992 Volume 21 Issue 6 Pages
1432-1433
Published: December 15, 1992
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[in Japanese], [in Japanese]
1992 Volume 21 Issue 6 Pages
1433-1434
Published: December 15, 1992
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[in Japanese], [in Japanese], [in Japanese]
1992 Volume 21 Issue 6 Pages
1434-1435
Published: December 15, 1992
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[in Japanese], [in Japanese]
1992 Volume 21 Issue 6 Pages
1435-1437
Published: December 15, 1992
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S KATOH, M KISHIMURA, H FUKUDA, H TANIGUCHI
1992 Volume 21 Issue 6 Pages
1438-1443
Published: December 15, 1992
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E SASAKI, T MAKATANI, H ANAI, H HIROSE, H TAKANO
1992 Volume 21 Issue 6 Pages
1444-1449
Published: December 15, 1992
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We contrived a method for real-time volumetry of balloons for IABP by measur-ing the electrical impedance. In this method, the impedance was measured continuously between two electrodes at both ends of the balloon within a rigid tube, which was filled with saline solution. Balloon volume (V
B) was calculated following equation. V
B=(R
I-R
D)V
0/R
I, (R
I, R
D: impedance value at inflation and deflation state of balloon, respectively. V
0: tube volume between electrodes). We evaluated the performance of 6 balloons (Kontron 40 ml 9 Fr, Datascope 34ml 9.5 Fr, Boston_ Scientific 40 ml 10 Fr, 30 ml 9.5 Fr and Tokai Medical Products 37 ml 10.5 Fr, 22 ml 9.5 Fr) and 4 driver systems (Kontron KAAT, Datascope system 90 T, Boston Scientific Cardiac Assist 3001 and Toyobo VCT 30). Results showed different driving pressure-balloon volume loops and responses. And each driver system had specific working characteristics. We conclude that recognition of characteristics of driver system is important to use IABP safely and appropriately, and care should be taken when a balloon is used in conjunction with different manufacturer's driver system.
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Acute experiments on the normal heart model
T KUSAKA, T NAKAMURA, T MATSUMOTO, K HAYASHI, M ASADA, K YASUDA, T TAN ...
1992 Volume 21 Issue 6 Pages
1450-1456
Published: December 15, 1992
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Hemodynamic and mechanical effects of a left ventricular assist device (LVAD) implanted between the left ventricular apex and the descending thoracic aorta (apical bypass) were studied in the in vivo acute experiments on mongrel dogs with normal hearts. Bulk and regional mechanics of the left ventricle were investigated by using implantable miniature sonomicrometers. LVAD was driven in five pumping modes: electrocardiogram synchronous modes with the duty factors of 1:1, 2:1 and 4:1, and asynchronous modes with the pulse rates of 60 and 80 beats/min (bpm). In all the pumping modes but 4:1 mode, almost total bypass was obtained. Moreover, neither the whole left ventricle nor the regional cardiac muscles virtually worked under LVAD pumping in the above pumping modes, and almost 100% of the ventricular work was unloaded. The above results reveal the possibility that the apical bypass method is more effective in circulatory assist and in ventricular unloading compared with the atrial bypass method in which LVAD is implanted between the left atrium and descending thoracic aorta.
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Y KAWASHIMA, T ABE, T BAN, S KITAMURA, M KUSAKAWA, T MIYAMOTO, N NAKAJ ...
1992 Volume 21 Issue 6 Pages
1457-1464
Published: December 15, 1992
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The system of left heart bypass using a Medtronic Bio-Medicus centrifugal pump in the surgery for descending thoracic aortic aneurysm was evaluated of its reliability and effectiveness at 10 institutes in conformity with the Japanese Drugs, Cosmetics and Medical Instruments Act. In a total 38 patients, bypass time ranged from 22 to 264 min with the average being 116 min, and mean bypass flow averaged 2.0±0.81/min. In one case, thrombus formation was noted in a blood reservoir for the rapid transfusion system, and insubstantial paralytic ileus developed postoperatively. In the other 37 cases, no apparent complications relating to the Bio-Pump system were recognized. It was determined that in all cases the system was effective compared with other conventional methods such as temporary shunt or partial cardiopulmonary bypass. In conclusion, left heart bypass with a Medtronic Bio-Medicus centrifugal pump was evaluated as an effective and reliable method in the operation for descending thoracic aortic aneurysm.
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