Kohsuke Ajiki

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The efficacy of electrical defibrillation is considered to be related to the autonomic status. In search of a possible adjunct to enhance the therapeutic performance of an implantable cardioverter-defibrillator. we investigated whether parasympathetic manipulation by cervical vagal nerve stimulation (VNS) increases defibrillation efficacy. The effects of(More)
Prolonged QT interval is suggested to indicate an increased risk of sudden cardiac death in certain clinical conditions such as diabetes mellitus. We investigated whether the individual QT interval is an indicator of an autonomic state. An ambulatory 24-hour ECG was recorded in 53 subjects from different clinical backgrounds. Power spectral components of(More)
To characterize slow abnormal conduction in the low right atrium, which is known to be responsible for atrial flutter, electrophysiologic findings were correlated with anatomic features in a canine model of atrial flutter with ligation of the crista terminalis in the midright atrium. Activation in the low right atrium was mapped with a patch electrode(More)
INTRODUCTION This study was designed to test whether the refractory state of nondepolarized myocardium is a major determinant of electrical defibrillation. METHODS AND RESULTS Postshock recovery interval (PSRI) was estimated by measuring the residual refractory period after an appropriately timed field stimulus (1 to 16 V). The PSRI and transcardiac(More)
An asymptomatic 35 year-old man was referred to our hospital because of abnormal ECG findings. The ECG showed complete right bundle branch block and left anterior hemiblock. Echocardiography revealed a moderately enlarged right ventricle (RV) and an apical aneurysm. RV wall motion showed diffusely moderate impairment, while the systolic function of the left(More)
Atrial tachycardia (AT) and atrial fibrillation (AF) were observed in a 21-year old male who had a history of patch closure for an atrial septal defect (ASD) at the age of 5 and a persistent left superior vena cava (LSVC). During electrophysiologic study, atrial extrastimuli reproducibly induced AT which spontaneously terminated or changed into AF.(More)
DDD pacemaker pseudomalfunction occurred in a 65-year-old man. This was due to premature ventricular contraction (PVC) response option and cross-talk detection window, which are designed to protect against pacemaker related tachycardia or cross-talk. Pseudomalfunction disappeared by eliminating PVC response option.
To test whether fatal deterioration of defibrillation efficiency during antiarrhythmic therapy can be prevented by avoiding extreme decrease in ventricular prevented by avoiding extreme decrease in ventricular conduction or toxic plasma drug levels, we determined the defibrillation threshold (DFT) before and during infusion of incremental doses of(More)