Munenori Okubo

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OBJECTIVES The purpose of the present study was twofold: 1) to evaluate the usefulness of three-dimensional (3D) integrated backscatter (IB) intravascular ultrasound (IVUS) for quantitative tissue characterization of coronary plaques; and 2) to use this imaging technique to determine if six months of statin therapy alters the tissue characteristics of(More)
OBJECTIVES This study aims to define tissue characteristics of vulnerable plaques before acute coronary syndrome (ACS) by use of integrated backscatter intravascular ultrasound (IB-IVUS). BACKGROUND Tissue characterization of coronary plaques is possible with the use of IB-IVUS. METHODS The subjects were 140 patients with angina pectoris, and we(More)
BACKGROUND The purpose of this study was to develop a new online integrated backscatter intravascular ultrasound (IB-IVUS) system and to validate its ability to measure fibrous cap thickness by comparing IB-IVUS images with those from optical coherence tomography (OCT). METHODS AND RESULTS Images were acquired from 125 segments of 26 coronary arteries(More)
An 80-year-old male patient underwent a coronary angioplasty without signs of complications. The day after the procedure, the patient complained of chest pain. The electrocardiogram showed a widespread ST segment elevation. A chest X-ray revealed pulmonary congestion with pleural effusion. There was no significant pericardial effusion detected with an(More)
Tissue characterization of plaques of coronary arteries is important to clarify the process of acute coronary syndrome and prevent it. The purpose of this study is to develop an online integrated backscatter intravascular ultrasound (IB-IVUS) system and validate the diagnostic accuracy for the characterization of coronary plaques. A personal computer(More)
BACKGROUND Integrated backscatter (IB) intravascular ultrasound (IVUS) and IVUS Virtual Histology (VH) have been developed for tissue characterization, but have never been compared directly. The purpose of this study was to compare the overall agreement between IB-IVUS and IVUS-VH in the tissue characterization of plaques from the same coronary arterial(More)
Abnormal vascular smooth muscle cell (VSMC) proliferation and migration are involved in restenosis following percutaneous transluminal angioplasty (PTCA) as well as in the development and progression of atherosclerosis. We investigated the mechanisms underlying the inhibitory effect of the sesquiterpene(More)
BACKGROUND Autopsy studies have shown atherosclerotic changes in angiographically normal coronary lesions (ANCL), and conventional intravascular ultrasound shows intimal thickening in these lesions, but cannot differentiate the lipid core. Accurate characterization of ANCL is essential to prevent progression to coronary artery disease. METHODS AND RESULTS(More)
BACKGROUND Echocardiographic parameters to predict pulmonary capillary wedge pressure (PCWP) in mitral regurgitation (MR) are not yet elucidated. We reported that PCWP could be accurately estimated by novel KT index which is defined as log10[left atrial (LA) emptying function (EF)/LA volume]. We examined the usefulness of the KT index as a predictor of PCWP(More)
BACKGROUND The purpose of this study was to determine the cut-off values of Hounsfield units (HU) for the discrimination of plaque components and to evaluate the feasibility of measurement of the volume of plaque components using multi-detector row computed tomography (MDCT). METHODS Coronary lesions (125 lesions in 125 patients) were visualized by both(More)