Hiroyuki Toyoshima

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The usefulness of multidetector-row computed tomography (MDCT) for visualization of coronary arteries has been reported; however, little is known about the diagnostic capability of noninvasive coronary angiography (CA) using 8-detector row CT. We investigated the visualization and diagnostic values of 8-slice MDCT-CA. Twenty-five consecutive patients who(More)
Ten patients who underwent conventional coronary angiography (CA) were examined with both 8- and 16-slice multidetector-row computed tomography (MDCT) angiography within 6 months, and visibility and image quality of 16-slice MDCT-CA were compared with those of 8-slice MDCT-CA directly. In 136 segments determined by conventional CA, 101 (74.3%) and 126(More)
Canine ventricular refractory periods were measured during test site drive, during drive of single ectopic sites, during fusion drive from two ectopic sites, and during fusion drive from an ectopic site and the test site. Refractory period duration was dependent on the driving modes employed. Refractory periods were 2.63 +/- 0.73%, 3.42 +/- 0.87%, 3.54 +/-(More)
Monophasic action potentials from 32 to 43 epicardial sites were recorded with concentric suction electrodes in 11 dogs during atrial pacing at a constant rate. The duration of action potentials and the sequence of repolarization referenced to the onset of ventricular activation at 50% of the highest plateau amplitude and the end of the action potential(More)