Takeshi Shimooka

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Sirs, The development of acute renal failure (ARF) in young children with acute gastroenteritis can lead to a presumptive diagnosis of pre-renal azotemia resulting from diarrheal dehydration. Recently, however, several cases of children with acute post-renal failure due to bilateral obstructive uric acid stones associated with acute gastroenteritis have(More)
The multi-output adaptive controller of a left ventricular assist device (LVAD) was studied by computer simulation. The controller regulated two outputs--mean aortic pressure (mAoP) and mean atrial pressure (mLAP)--by regulating vacuum pressure (input). The autoregressive models were used to describe the circulatory system. The parameters of the models were(More)
Conventional bileaflet prosthetic mechanical heart valves close passively with backflow. Naturally, the valve has problems associated with closure, such as backflow, water hammer effect, and fracture of the leaflet. On the other hand, in the case of the natural aortic valve, the vortex flow in the sinus of Valsalva pushes the leaflet to close, and the valve(More)
To overcome the wear problems associated with artificial joint materials, new surface structures with regular patterning were designed and fabricated. The lubrication properties were studied to evaluate the wear of the frictional surfaces. The surface structure was a pattern of "dents" with a diameter of 0.2-1.0 mm and a pitch of 0.6-2.0 mm. The pattern was(More)
The effect of LVAD on the preservation of cardiac reserve against ischemic damage was studied using Sarnoff's ventricular function curve. An LVAD was implanted between the canine left atrium and the aorta. Left ventricular function was measured by changing the height of the reservoir connected to the left atrium. The left ventricular function curve (LVFC)(More)
The presence of a cytokine storm is recognized as a condition possibly involved in the mechanism for the onset, aggravation and progression of acute encephalitis/encephalopathy. Plasma exchange and slow hemodiafiltration have been used as the means of blood purification to deal with acute encephalitis/encephalopathy. It has been suggested that blood(More)
There are various reports on the fracture of mechanical heart valves implanted in humans or animals and it has been pointed out that fractures are induced by erosion of the disk surface due to cavitation bubbles. Cavitation erosion on mechanical heart valves was studied using our originally designed accelerated fatigue tester. Several valve housings with(More)
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