Publications by authors named "Obayashi Y"

Background: Low-gradient (LG) aortic stenosis (AS) has not been fully characterized compared with high-gradient (HG) AS in terms of cardiac damage, frailty, aortic valve calcification, and clinical outcomes.

Objectives: The aim of this study was to compare the clinical characteristics and outcomes between each hemodynamic type of LG AS and HG AS.

Methods: The current study included 3,363 patients in the CURRENT AS (Contemporary outcomes after sURgery and medical tREatmeNT in patients with severe Aortic Stenosis) Registry-2 after excluding patients without indexed stroke volume or left ventricular ejection fraction (LVEF) data.

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Background: There is a paucity of data on safety of calcium channel blockers (CCB) in patients with severe aortic stenosis (AS) and hypertension.

Methods And Results: Among 2,460 patients with severe AS and hypertension receiving antihypertensive therapy in the CURRENT AS registry-2, we compared the clinical outcomes between patients taking antihypertensive therapy with CCB (CCB group) and without CCB (no CCB group). In the entire study population, CCB was prescribed in 1,763 patients (71.

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  • * TAVI centers preferred aortic valve replacement (AVR) treatments, with a higher percentage opting for transcatheter aortic valve implantation (TAVI) compared to non-TAVI centers (71% vs. 23%).
  • * Despite the differences in treatment frequency, both types of centers showed similar rates of all-cause death or heart failure hospitalizations over three years, indicating no significant outcome difference.
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Background: Data on the impact of valve position on clinical outcomes in patients with atrial fibrillation (AF) and bioprosthetic valves (BPVs) are limited.

Methods And Results: The BPV-AF Registry was a multicenter, prospective, observational study involving 894 patients with BPVs and AF. In this post-hoc substudy, patients were classified according to BPV position: aortic (n=588; 65.

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A 75-year-old man with a history of small intestinal angioectasia underwent transcatheter edge-to-edge repair for severe functional mitral regurgitation, resulting in recovery of large von Willebrand Factor multimers. This case highlights the potential of transcatheter edge-to-edge repair to manage both heart failure and acquired von Willebrand disease associated with functional mitral regurgitation.

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Aims: Safety of aspirin-free strategy immediately after percutaneous coronary intervention (PCI) for cardiovascular events in patients with diabetes was unknown.

Methods And Results: We conducted the prespecified subgroup analysis on diabetes in the STOPDAPT-3 trial, which randomly compared prasugrel (3.75 mg/day) monotherapy (2984 patients) to dual antiplatelet therapy (DAPT) with prasugrel and aspirin (2982 patients) in patients with acute coronary syndrome or high bleeding risk.

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  • Researchers studied the effects of ramucirumab (RAM) before nivolumab treatment in patients with advanced gastric cancer to see if it improved immune cell function and survival rates.
  • The study analyzed 52 patients' outcomes, comparing those who received RAM with those who did not, finding that the RAM group had significantly longer overall survival (8.5 months vs 6.9 months).
  • The results indicated that RAM usage before nivolumab may enhance survival, particularly in patients without peritoneal metastasis, who showed even better outcomes (23.8 months vs 7.7 months).
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  • A trial, STOPDAPT-3, was conducted to compare aspirin monotherapy and clopidogrel monotherapy after short-term dual antiplatelet therapy in patients who underwent percutaneous coronary intervention using drug-eluting stents.
  • The study involved 5,833 patients who were followed for 30 days, focusing on cardiovascular events (like heart attacks) and bleeding complications as primary endpoints.
  • Results showed that aspirin and clopidogrel monotherapy had similar rates of cardiovascular and bleeding events up to one year after the intervention, indicating both treatments are equally effective in these contexts.
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  • Smiling during conversation fosters good relationships, but the influence of one person's smile on another's has been unclear.
  • Researchers studied how the amount of smiling in conversations changes based on the listener's smile using automated facial expression analysis.
  • Results showed that speakers smile more in response to greater smiles from listeners, especially when they share the same gender, indicating a synchronized interaction in their smiling behavior.
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Soft tunic syndrome is an infectious disease caused by the flagellate Azumiobodo hoyamushi, which severely damages the aquaculture of the edible ascidian Halocynthia roretzi. Tunic is a cellulosic extracellular matrix entirely covering the body in ascidians and other tunicates, and its dense cuticle layer covers the tunic surface as a physical barrier against microorganisms. When the tunic of intact H.

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  • - The study analyzed the impact of using an aspirin-free strategy versus dual antiplatelet therapy (DAPT) in patients undergoing coronary intervention while on oral anticoagulation (OAC).
  • - Among nearly 6,000 patients, the outcomes showed no significant difference in major bleeding events between the two strategies, regardless of OAC use.
  • - However, there was a slightly higher risk of cardiovascular events with the aspirin-free approach in patients taking OAC, suggesting potential concerns about this strategy's safety in high-risk groups.
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  • Current guidelines suggest avoiding anticoagulation after PCI for acute coronary syndrome (ACS), but this recommendation lacks strong evidence.
  • In a study analyzing outcomes of patients with ACS who did or did not receive post-PCI heparin, those receiving heparin had a significantly higher risk of bleeding and a slightly increased risk of cardiovascular events.
  • The use of post-PCI heparin in ACS patients was common, but it was linked to increased bleeding without demonstrating any clear benefit in reducing serious cardiovascular outcomes.
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Matrix metalloproteinases (MMPs) degrade extracellular matrix proteins and are important for placenta formation during early pregnancy. Recurrent pregnancy loss (RPL) is associated with abnormalities in endometrial extracellular matrix remodeling. This study aimed to elucidate the roles of MMP2 and MMP9 in RPL pathogenesis.

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Background: There was no study evaluating the effects of an aspirin-free strategy in patients undergoing complex percutaneous coronary intervention (PCI).

Objectives: The authors aimed to evaluate the efficacy and safety of an aspirin-free strategy in patients undergoing complex PCI.

Methods: We conducted the prespecified subgroup analysis based on complex PCI in the STOPDAPT-3 (ShorT and OPtimal duration of Dual AntiPlatelet Therapy after everolimus-eluting cobalt-chromium stent-3), which randomly compared low-dose prasugrel (3.

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  • The study analyzed the presence of mitral regurgitation (MR) in patients with severe aortic stenosis (AS) and how it relates to different treatment methods: TAVI, SAVR, and conservative management.
  • Among the 3,365 patients examined, 384 (11.4%) had moderate/severe MR, and this group showed a significantly higher 3-year incidence of death or heart failure (HF) hospitalization compared to those with no/mild MR.
  • The risk of death or HF hospitalization was notably higher in patients treated with SAVR and conservative strategies, while this risk was less clear in those who underwent TAVI.
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Background: Interventions and care that can evoke positive emotions and reduce apathy or agitation are important for people with dementia. In recent years, socially assistive robots used for better dementia care have been found to be feasible. However, the immediate responses of people with dementia when they are given multiple sensory modalities from socially assistive robots have not yet been sufficiently elucidated.

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Objective Although the characteristics of Helicobacter pylori infection have been extensively reported, there is a lack of consensus regarding its characteristics in young adults. The present study examined the endoscopic and histological characteristics of young adults who underwent eradication therapy for H. pylori infection.

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Background And Aims: High bleeding risk (HBR) and acute coronary syndrome (ACS) subtypes are critical in determining bleeding and cardiovascular event risk after percutaneous coronary intervention (PCI).

Methods And Results: In 4476 ACS patients enrolled in the STOPDAPT-3, where the no-aspirin and dual antiplatelet therapy (DAPT) strategies after PCI were randomly compared, the pre-specified subgroup analyses were conducted based on HBR/non-HBR and ST-segment elevation myocardial infarction (STEMI)/non-ST-segment elevation ACS (NSTE-ACS). The co-primary bleeding endpoint was Bleeding Academic Research Consortium (BARC) type 3 or 5, and the co-primary cardiovascular endpoint was a composite of cardiovascular death, myocardial infarction, definite stent thrombosis, or ischaemic stroke at 1 month.

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This study aimed to examine the validity and reliability of the expanded version of the Posttraumatic Growth Inventory-Japanese version (PTGI-X-J) among Japanese women who delivered by cesarean section. The study is a cross-sectional survey psychometric study. Participants were 517 Japanese women who were in the hospital after childbirth by cesarean section at six general hospitals and two obstetric clinics in Tokai Region, Japan.

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Background: Bleeding rates on dual antiplatelet therapy (DAPT) within 1 month after percutaneous coronary intervention (PCI) remain high in clinical practice, particularly in patients with acute coronary syndrome or high bleeding risk. Aspirin-free strategy might result in lower bleeding early after PCI without increasing cardiovascular events, but its efficacy and safety have not yet been proven in randomized trials.

Methods: We randomly assigned 6002 patients with acute coronary syndrome or high bleeding risk just before PCI either to prasugrel (3.

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Background: Female pattern hair loss (FPHL) is known to present with characteristic pathological conditions, including reduced overall hair density. Female hormones affect hair condition; however, the detailed mechanism is unknown. Furthermore, research on the topic is complicated by the fact that senescent alopecia often occurs concurrently with FPHL.

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Background: It remains unclear whether clopidogrel is better suited than aspirin as the long-term antiplatelet monotherapy following dual antiplatelet therapy (DAPT) after percutaneous coronary intervention (PCI).

Objectives: This study compared clopidogrel monotherapy following 1 month of DAPT (clopidogrel group) with aspirin monotherapy following 12 months of DAPT (aspirin group) after PCI for 5 years.

Methods: STOPDAPT-2 (Short and Optimal Duration of Dual Antiplatelet Therapy 2) is a multicenter, open-label, adjudicator-blinded, randomized clinical trial conducted in Japan.

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  • * The study analyzed data from 1025 patients who underwent systemic chemotherapy from 2012 to 2018 at various Japanese institutions, using the Cox proportional hazards regression model to determine key prognostic factors.
  • * Eight significant prognostic factors were identified, with findings showing that patients treated with trastuzumab had better survival rates compared to those who received standard chemotherapy alone, emphasizing the importance of tailored treatment strategies.
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  • The study focused on the effects of mitral regurgitation (MR) on long-term health outcomes in acute myocardial infarction (AMI) patients who had a percutaneous coronary intervention (PCI).
  • In a cohort of 5,266 patients, those with more severe MR had higher rates of hospitalization for heart failure (HF), but their risk of all-cause and cardiovascular death did not significantly increase over time.
  • Although severity of MR did not correlate with increased mortality risk, both mild and moderate/severe MR were linked to significantly higher hospitalization rates for HF during a median follow-up of 5.6 years.
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