Publications by authors named "Masahiko Shimizu"

Article Synopsis
  • Direct observation of copper (Cu) within Cu-chabazite (CHA) zeolite has been successfully achieved through a method called electron ptychography, using Wigner distribution deconvolution for analysis.
  • The study assessed the imaging capabilities of the ptychography technique by comparing simulated images of zeolite columns with and without Cu, revealing that false contrasts can occur but the method can effectively differentiate between Cu-containing and Cu-free columns.
  • Experimental results indicated that images taken of samples containing Cu displayed significant contrast in the six-membered rings, whereas no such contrast was seen in those without Cu, highlighting ptychography's potential for studying sensitive materials at the atomic level.
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Aims: We previously reported the association of single nucleotide polymorphisms in the lymphotoxin alpha (LTα) gene with susceptibility to acute myocardial infarction (AMI) and increased mortality after discharge. In the present study, we investigated whether the adverse effect of LTα C804A polymorphism on mortality could be pharmacologically modified by statin treatment after AMI.

Methods And Results: We conducted a multicenter study that included 3486 post-AMI patients between 1998 and 2008.

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Background: Little is known about the prognostic significance of elevated serum heart-type fatty acid-binding protein (H-FABP) in post-acute myocardial infarction (post-AMI) patients.

Methods And Results: A total of 1,283 post-AMI patients with available serum samples collected in the convalescent stage were studied. During a median follow-up period of 1,785 days, 176 patients (14%) had adverse events (all-cause mortality, n=81; non-fatal MI, n=44; readmission for heart failure [HF], n=51).

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Although clinical guidelines recommend long-term β-blocker (BB) therapy to decrease mortality after acute myocardial infarction, these recommendations are based predominantly on evidence from before the reperfusion and thrombolytic eras. To investigate the effects of BB therapy for patients with acute myocardial infarctions on mortality in the percutaneous coronary intervention era, a total of 5,628 consecutive patients who were admitted <24 hours after the onset of ST-segment elevation myocardial infarction, treated with emergent percutaneous coronary intervention, and discharged alive were studied. During a median follow-up period of 1,430 days, mortality rates did not differ between patients with and without BB therapy (5.

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Background: In the percutaneous coronary intervention (PCI) era, little evidence exists regarding the incidence, predictors and long-term mortality of recurrent myocardial infarction (Re-MI) following discharge for acute myocardial infarction (AMI).

Methods And Results: A total of 7,870 patients who survived AMI were studied with a median follow-up period of 3.9 years: 353 patients (4.

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To investigate the prognostic impact of circulating microRNAs (miRs) in patients who survived acute myocardial infarction (AMI), we compared the circulating miR signature at the time of survival discharge among samples in the serum bank of the Osaka Acute Coronary Insufficiency Study. Using a high-throughput array consisting of 667 miRs, 11 miRs were found to be differentially expressed in the serum among patients at high-risk for cardiac death. Real-time RT-PCR confirmed that the serum levels of miR-155 and miR-380* were approximately 4- and 3-fold higher, respectively, in patients who experienced cardiac death within 1 year after discharge.

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Background: The purpose of this study was to investigate the association between depression symptoms 1 year after onset and subsequent cardiovascular events among survivors of myocardial infarction (MI).

Methods And Results: The participants were recruited from respondents to a district-based survey known as the Osaka Acute Coronary Insufficiency Study. Of 4,271 eligible MI patients, 1,951 completed the Zung Self-Rating Depression Scale (SDS) at their 1-year follow-up examination.

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Background: Previous studies showed that nicorandil can reduce coronary events in patients with coronary artery disease. However, it is unclear whether oral nicorandil treatment may reduce mortality following acute myocardial infarction (AMI).

Methods And Results: We examined the impact of oral nicorandil treatment on cardiovascular events in 1846 AMI patients who were hospitalized within 24 h after AMI onset, treated with emergency percutaneous coronary intervention (PCI), and discharged alive.

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Alloimmune recurrent spontaneous abortion (RSA) cases that could not be treated with lymphocyte transfusion due to medical and social reasons were treated with Sairei-to therapy as an emergency measure and all four cases resulted in live births. This may show that Sairei-to treatment is effective in preventing alloimmune RSA. The efficacy of Sojyutsu-Sairei-to and Byakujyutsu-Sairei-to on autoimmune RSA has already been proven.

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The differences in individual efficacy of two Sairei-to preparations (Sojyutu-Sairei-to and Byakujyutu-Sairei-to) on antinuclear antibody (ANA) and anticardiolipin antibody (ACLA) positive recurrent spontaneous abortion (RSA) was analyzed in 52 patients (a total of 61 treatment sessions). Patients who failed to respond to initial treatment with Sojyutu-Sairei-to were additionally treated with Byakujyutu- Sairei-to, and the time course of ANA and ACLA titers in these patients was analyzed. ACLA titers were decreased significantly by the treatment of Byakujyutu-Sairei-to, however, the percentage of successfully prevented abortion cases did not differ significantly between the Sojyutu-Sairei-to treatment group and the Byakujyutu-Sairei-to treatment group.

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Background: There is limited evidence about useful therapeutic interventions for patients with acute hyperglycemia (AH) after acute myocardial infarction (AMI).

Methods: We studied 2433 consecutive non-diabetic AMI patients who underwent percutaneous coronary intervention (PCI) within 24h after the onset. Patients were divided into two groups according to the presence or absence of AH (admission serum glucose level ≥ 11.

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Background: There is little data regarding the clinical impact of diabetes mellitus (DM) on heart failure (HF) among survivors of acute myocardial infarction (AMI) in the percutaneous coronary intervention (PCI) era.

Methods And Results: The present study group comprised 4,035 survivors who underwent PCI within 24 h of the onset of symptoms. DM was an independent predictor of rehospitalization for HF by multivariate analysis (hazard ratio (HR) 1.

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We recently reported that the single nucleotide polymorphisms of the lymphotoxin-(LT)alpha gene, a member of the tumor necrosis factor (TNF) family, are closely related to acute myocardial infarction; however, the precise mechanism of LTalpha signaling in atherogenesis remains unclear. We investigated the role of LTalpha3, a secreted homotrimer of LTalpha, in monocyte-endothelial cell adhesion using cultured human umbilical vein endothelial cells (HUVEC). We found that LTalpha3 induced cell adhesion molecules and activated NF-kappaB p50 and p65.

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Glossodynia, or tongue pain, is resistant to conventional therapies. Kampo medicines were evaluated in patients suffering from incurable glossodynia. Patients were diagnosed by traditional Chinese medicine (TCM) theory in order to determine the appropriate herbal prescriptions.

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Background: We recently reported that the A252G polymorphism of the Lymphotoxin-alpha (LTA) gene, a member of the tumor necrosis factor family, is strongly related with the onset of acute myocardial infarction; however, the roles of LTA in the development of atherosclerosis remain unclear.

Methods And Results: Changes in gene expression profile in cultured human umbilical vein (HUVEC) and coronary artery endothelial cells (HCAEC) treated with LTA were analyzed with high density oligonucleotide arrays comprised of 8,500 genes. LTA stimulation at 10 ng/mL for 2 hours profoundly induced gene expression associated with signal transduction, cell adhesion and chemoattraction, such as the nuclear factor of kappa light polypeptide gene enhancer in B-cells (NFkB), endothelial adhesion molecule 1 (E-Selectin), vascular cell adhesion molecule 1 (VCAM1), and monocyte chemotactic protein 1 (MCP1) (2.

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Background: It is unclear whether early initiation of low-dose pravastatin therapy can reduce the occurrence of major adverse cardiac events after acute myocardial infarction (AMI).

Methods And Results: The study group comprised 353 patients with AMI who had plasma total cholesterol levels of 200-250 mg/dl and triglyceride levels <300 mg/dl. The patients were randomly assigned to either receive pravastatin (10 mg/daily, n=176) or not (n=177).

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Recently, an association between minimally elevated cardiac troponin levels and cardiovascular risk in the general population has been reported. However, the prevalence and clinical importance of elevated cardiac troponin T (cTnT) levels remain unclear in patients with histories of myocardial infarction (MI). In this study, 1,807 consecutive patients with ST-segment elevation MIs were prospectively studied (77.

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Insertion of intracoronary thrombectomy (ICT) devices, as a precedent to percutaneous coronary intervention (PCI), theoretically could have a beneficial effect on the outcome in patients with acute myocardial infarction. To examine whether ICT was associated with a lower 30-day mortality rate in patients with acute myocardial infarction, we studied 3,913 patients who underwent PCI within 24 hours after onset. A total of 990 patients (25.

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Little information is available regarding the clinical effect of metabolic syndrome (MS) or its combined effect with smoking on subsequent cardiac events after acute myocardial infarction (AMI). To examine whether MS independently predicts cardiac events (cardiac death and nonfatal reinfarction) and to assess the combined effect of MS and smoking on cardiac events after AMI, we studied 3,858 survivors of AMI registered in the Osaka Acute Coronary Insufficiency Study (OACIS). During a median follow-up of 725 days, the incidence of cardiac events was higher in patients with MS than in those without MS (p=0.

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Background: In patients with acute myocardial infarction (AMI), depressive symptoms increase the risk for cardiac events. Recently, the S allele of the serotonin transporter (5-HTT) gene-linked polymorphic region was shown to reduce transcription of this gene and thus reduce serotonin reuptake, and this allele is linked with depressive symptoms as well as other psychiatric diseases. However, the influence of the S allele on depressive symptoms and cardiac events after AMI is unclear.

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Background: The hospital stay after acute myocardial infarction (AMI) is still extremely long in Japan and does not correspond with disease severity. The purpose of the present study was to identify a subgroup of AMI patients suitable for early discharge.

Methods And Results: A total of 3,739 AMI patients treated with percutaneous coronary intervention (PCI) within 24 h after onset, who enrolled Osaka Acute Coronary Insufficiency Study between April 1998 and March 2004, were studied.

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We evaluated the interaction between inflammation and survival benefit from statin therapy in patients who had acute myocardial infarction. Although 1-year mortality did not differ between patients who used statin therapy and those who did not, among patients who had C-reactive protein (CRP) concentrations in the lower 2 tertiles (<2.9 mg/L), 1-year mortality was higher in patients who used statin therapy than in those who did not within the highest CRP-defined tertile (> or =2.

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Background: Distal protection, in the Saphenous Vein Graft Angioplasty Free of Emboli (SAFER) trial, is demonstrated to prevent distal embolism in the percutaneous coronary intervention of saphenous vein graft. However, in the Enhanced Myocardial Efficacy and Recovery by Aspiration of Liberated Debris (EMERALD) trial, it was not effective in the percutaneous coronary intervention of native coronary arteries in patients with acute myocardial infarction (AMI). We hypothesized that its effectiveness would be determined by lesion characteristics.

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Background: It is well known that cardiac troponin T (TnT) elevation on admission indicates a high-risk subgroup among patients with non-ST-segment elevation acute coronary syndrome (NSEACS). Although the mechanism of TnT elevation is speculated to be the microthromboembolism from unstable plaques, it has not been clarified. The aim of this study is to clarify the association between the serum TnT elevation and the angioscopically evaluated morphology of culprit lesion in the patients with NSEACS.

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Although previous epidemiologic studies have suggested an association between the onset of myocardial infarction (MI) and some genetic variations, the impact of these variants on recurrent cardiovascular events after MI has not been fully elucidated. We genotyped 87 polymorphisms of 73 atherosclerosis-related genes in consecutive acute MI patients registered in the Osaka Acute Coronary Insufficiency Study and compared the incidence of death and major adverse cardiac events (MACE) among the polymorphisms of each gene. After initial screening in 507 patients, we selected nine polymorphisms for screening in all 1586 patients.

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