Fumiaki Masani

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It is suspected that autoimmune disease processes are involved in the pathogenesis of a part of giant cell myocarditis. However, evidence for autoimmunity has rarely been demonstrated in clinical investigations. In this study, we have demonstrated a new animal model of autoimmune myocarditis characterized by the appearance of multinucleated giant cells.(More)
The myocardial layer of the pulmonary vein of adult rats was examined by electron microscopy. Among ordinary myocardial cells resembling those of the atrial myocardium, clear cells with structural features similar to those of sinus node cells were identified. They were distributed in the intrapulmonary, preterminal portion of the pulmonary vein. They(More)
A young woman who was experiencing repeated convulsions was admitted. The patient's brain magnetic resonance image revealed reversible posterior leukoencephalopathy. Blood pressure fluctuated at times to more than 200 mmHg, and the measurement of the right and left upper arms differed by approximately 70 mmHg. Enhanced computed tomography revealed stenotic(More)
The immunocytochemical localization of S-100 protein was examined in the hearts of adult guinea-pigs. In addition to Schwann cells, adipose cells and chondrocytes, fibroblast-like cells densely distributed in the cardiac skeleton, all of the four valves and tendinous chordae were immunoreactive for S-100 protein. The S-100-positive fibroblast-like cells(More)
A total of 38 patients with syncope in whom a cause was not assigned or suggested by the initial history, physical examination and electrocardiography (ECG) were studied. Twenty-four patients underwent cardiac examination with Holter ECG, electrophysiologic testing with programmed ventricular stimulation (EPS) and/or coronary arteriography including(More)
OBJECTIVES Preventive effects of cyclosporine, prednisolone and aspirin on autoimmune giant cell myocarditis in rats were investigated. BACKGROUND The therapeutic efficacy of immunosuppressants for human myocarditis is controversial. Although harmful effects of immunosuppressive therapy on experimental viral myocarditis have been reported, the effects on(More)
BACKGROUND The purpose of this study was to assess the candidates suitable for cardiac resynchronization therapy (CRT) and to examine the significance of the QRS duration in Japanese patients with idiopathic dilated cardiomyopathy (DCM). METHODS AND RESULTS The study population consisted of 357 patients. The selection criteria for candidates suitable for(More)
Myocardial tissues in arrhythmogenic-right ventricular dysplasia (ARVD), which were surgically resected from the site of origin of ventricular tachycardia (VT), were investigated optically and electron-microscopically. The site of origin was found to be occupied by an abundance of adipose cells. In the marginal zone, lipid droplets were obviously increased(More)