Masachika Negishi

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BACKGROUND Although automated external defibrillators (AEDs) have contributed to a better survival of out-of-hospital cardiac arrests, there have been reports of their malfunctioning. We investigated the diagnostic accuracy of commercially available AEDs using surface ECGs of ventricular fibrillation (VF), ventricular tachycardia (VT), and supraventricular(More)
BACKGROUND We performed contact force (CF) monitoring during pulmonary vein (PV) isolation to evaluate CF according to sheath type, catheter position, and inadequate ablation. METHODS Thirty consecutive patients (paroxysmal atrial fibrillation, 23; CHADS2 score, 0.5 ± 0.7; age, 56 ± 10 years) who underwent PV isolation using a CF-sensing catheter were(More)
Clinical features and treatment results of 33 patients with unruptured arteriovenous malformations (AVMs) were evaluated. Nine AVMs were located in the frontal lobe, 8 in the motor cortex, 5 in the parietal lobe, 6 in the temporal lobe, 2 in the occipital lobe and 3 in other parts of the brain. Nine patients were treated with microsurgery and 24 with(More)
Stereotactic posteroventral pallidotomy was carried out in 13 cases with rigid-akinesia-type Parkinson's disease with the aid of depth microrecording. The outcome of the pallidotomy was classified into four groups: excellent (6 cases), good (3 cases), moderate (3 cases) and fair (1 case). Electrophysiological study during the operation showed continuous(More)
INTRODUCTION Lead failures (LFs) are one of the most common complications in patients implanted with cardiovascular implantable electronic devices. LFs often cause serious secondary complications such as inappropriate ICD shocks or asystole. This study aimed to identify the clinical factors associated with the occurrence of LFs. METHODS A total of 735(More)
The role of intravascular embolization prior to radiosurgery of cerebral arteriovenous malformations was evaluated based on the basis of the results of gamma knife radiosurgery in relation to hemorrhage and early obliteration after treatment. Nine of 213 patients experienced hemorrhage 4 to 42 months after radiosurgery. All AVMs in these patients had(More)
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