Noboru Mizutani

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This study was designed to determine the susceptibility of implanted cardiac arrhythmia devices to electromagnetic interference in and around a magnetically levitated linear motor car [High-Speed Surface Transport (HSST)]. During the study, cardiac devices were connected to a phantom model that had similar characteristics to the human body. Three pacemakers(More)
External oxides of a commercially pure titanium (cpTi), Ti6Al4V alloy, and an experimental beta-type titanium alloy (Ti 53.4 wt%, Nb 29 wt%, Ta 13 wt%, and Zr 4.6 wt%) were characterized after heating to 600, 900, 1150, and 1400 degrees C in contact with three types of investments (alumina cement, magnesia cement, and phosphate-bonded) in air. XRD studies(More)
In six patients with chronic bradydysrhythmias, polysomnographies were performed before cardiac pacemaker implantation and over the week following implantation. A patient with third-degree atrioventricular block (AVB) and two patients with sinus node dysfunction (SND) were associated with sleep-disordered breathing (SDB). Their cardiac pacemaker therapies,(More)
This study was designed to evaluate ventricular dyssynchrony from the viewpoint of the interaction of right and left ventricular contractions. Forty-three patients, 24 with sick sinus syndrome, 9 with complete atrioventricular block, and 10 with normal sinus rhythm were involved in this study. Microtip transducer catheters were advanced into both the left(More)
Calcium phosphates were formed on five kinds of substrate metals using a hydrothermal-electrochemical method in an autoclave with two electrodes. The electrolyte dissolving NaCl, K2HPO4, CaCl2.2H2O, tris (hydroxymethyl) aminomethane, and hydrochloric acid was maintained at 100 degrees C, 150 degrees C and 200 degrees C. The counter electrode, the anode, was(More)
Following 4 weeks on placebo, eighteen patients with bradycardia-tachycardia syndrome (BTS) were treated with 100 mg xamoterol twice daily for 2-4 weeks. Ambulatory 24 h Holter electrocardiogram recordings showed that xamoterol decreased maximum heart rate from 140 +/- 5.1 to 107 +/- 6 beats min-1 (P < 0.001) during exercise, increased minimum heart rate(More)
Clinical effects of thrombolytic agent SM-9527 (double-chain tissue plasminogen activator) on left ventricular (LV) function were assessed in patients with acute myocardial infarction (AMI). A dose of 30 x 10(6) IU SM-9527 was given intravenously to patients with AMI within 6 h after onset. Of 159 candidates, 20 were excluded from the trial due to diseases(More)
 The relationship between pacing mode and sleep is not yet known, and therefore polysomnography was used to evaluate the effect. A total of 16 patients (8 men and 8 women; mean age, 72 ± 9 years) with DDD pacemakers made up the study population. Of these 16 patients, 8 patients had complete AV block and 8 patients had sick sinus syndrome. The recording was(More)
This paper proposes some questions that remain to be solved for single-pass DDD pacing. These are the possibility of obtaining atrial capture with floating atrial electrodes, the optimal site to obtain atrial capture, the pacing method to ensure atrial pacing, and the possibility of long-term, single-lead DDD pacing. We found that the distance between the(More)
 The Tokai Working Group on Cardiac Pacemakers was established in 1987 and initiated the Tokai Pacemaker Register in 1993. The register contains data on 1582 patients treated with 1582 generators and 2269 leads. The ECG indications for pacemaker implantation were 49.7% atrioventricular block, 41.1% sinus node dysfunction, and 7.4% atrial fibrillation.(More)