Publications by authors named "Michiya Hanyu"

Article Synopsis
  • The study examined the impact of very low levels of low-density lipoprotein cholesterol (LDL-C) on patients with coronary artery disease, using data from over 39,000 patients who underwent coronary revascularization.
  • It was found that patients with very low LDL-C levels (<85 mg/dL) had more health issues and a higher risk of all-cause mortality compared to those with higher levels, revealing significant risks for various types of death and heart failure.
  • Overall, the research suggests that lower LDL-C levels correlate with more serious health problems and increased mortality risk, highlighting the need for careful management of cholesterol levels in at-risk patients.
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  • Acquired von Willebrand syndrome (AVWS) is linked to cardiovascular diseases like mitral regurgitation (MR), leading to a decrease in large von Willebrand factor (VWF) multimers, but its specifics with MR are still not fully understood.
  • A study analyzed 84 patients with moderate to severe MR, finding that 69% exhibited a significant loss of VWF large multimers, especially in degenerative MR cases, but levels improved after mitral valve intervention.
  • The findings indicate that while MR is commonly associated with loss of VWF large multimers, the overall risk of gastrointestinal bleeding remains low, and hemoglobin levels tend to stay stable post-treatment.
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  • The study investigates life expectancy after aortic valve replacement (AVR) in patients with severe aortic stenosis (AS), highlighting a lack of existing data on this topic.
  • Data from 3815 patients in the CURRENT AS registry revealed that those who underwent AVR had better survival rates than those using a conservative treatment strategy, especially among younger patients.
  • The findings suggest that assessing surgical risk based on age and STS score can help estimate life expectancy post-AVR, which is crucial for deciding between surgical and transcatheter approaches.
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Background: Diabetes is a well-known risk factor for adverse outcomes after coronary revascularization.

Objectives: This study sought to determine high-risk subgroups in whom the excess risks of diabetes relative to nondiabetes are particularly prominent and thus may benefit from more aggressive interventions.

Methods: The study population consisted of 39,427 patients (diabetes: n = 15,561; nondiabetes: n = 23,866) who underwent first percutaneous coronary intervention (n = 33,144) or coronary artery bypass graft (n = 6,283) in the pooled CREDO-Kyoto PCI/CABG (Coronary Revascularization Demonstrating Outcome Study in Kyoto Percutaneous Coronary Intervention/Coronary Artery Bypass Graft) registry.

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Article Synopsis
  • - The study compares the long-term outcomes of percutaneous coronary intervention (PCI) using new-generation drug-eluting stents (DES) and coronary artery bypass grafting (CABG) in 2,464 patients with multi-vessel coronary artery disease.
  • - Although the 5-year risk of combined events like death, heart attack, or stroke was not significantly different between the two groups, adjusted analysis showed that PCI had a higher risk of myocardial infarction and the need for additional revascularization compared to CABG.
  • - The findings suggest that while both procedures have similar outcomes regarding death and stroke, PCI with new-generation DES may carry a greater long-term risk for major cardiovascular issues in patients requiring complex multi-vessel treatments
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Article Synopsis
  • A study analyzed 3,815 patients with severe aortic stenosis (AS) to evaluate the impact of concomitant moderate/severe mitral regurgitation (MR) on clinical outcomes.
  • Patients were divided based on their initial treatment strategy: aortic valve replacement (AVR) or conservative management, and their outcomes were tracked for a composite of aortic valve-related death or heart failure hospitalization.
  • The 5-year outcomes showed that while moderate/severe MR was linked to higher incidences of adverse effects, it wasn't independently associated with increased risk for complications in either treatment group after adjusting for other factors.
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The treatment of coronary artery disease has substantially changed over the past two decades. However, it is unknown whether and how much these changes have contributed to the improvement of long-term outcomes after coronary revascularization. We assessed trends in the demographics, practice patterns and long-term outcomes in 24,951 patients who underwent their first percutaneous coronary intervention (PCI) (n = 20,106), or isolated coronary artery bypass grafting (CABG) (n = 4,845) using the data in a series of the CREDO-Kyoto PCI/CABG Registries (Cohort-1 [2000 to 2002]: n = 7,435, Cohort-2 [2005 to 2007]: n = 8,435, and Cohort-3 [2011 to 2013]: n = 9,081).

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There is a scarcity of data comparing long-term clinical outcomes between percutaneous coronary intervention (PCI) and coronary artery bypass grafting (CABG) in patients with three-vessel coronary artery disease (3VD) in the new-generation drug-eluting stents era. CREDO-Kyoto PCI/CABG registry Cohort-3 enrolled 14927 consecutive patients who had undergone first coronary revascularization with PCI or isolated CABG between January 2011 and December 2013. We identified 2525 patients with 3VD (PCI: n = 1747 [69%], and CABG: n = 778 [31%]).

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Background: The effect of multiple prior percutaneous coronary interventions (PCIs) before subsequent coronary artery bypass grafting (CABG) on long-term outcomes has not been well elucidated.

Methods and results: Between 2007 and 2016, 1,154 patients undergoing primary isolated CABG in our institution had no prior PCI (Group N), 225 had a single prior PCI (Group S), and 272 had multiple prior PCIs (Group M). Cumulative incidences of all-cause death, cardiac death and myocardial infarction (MI) at 10 years post-CABG were highest in Group M.

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A 74-year-old woman, with a history of aortic valve replacement and open mitral commissurotomy due to rheumatic aortic and mitral stenosis, presented with dyspnea. She developed severe tricuspid regurgitation (TR), requiring tricuspid valve replacement (TVR). Despite an uneventful postoperative course, she was readmitted for dyspnea 2 months later.

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Background: The use of transcatheter or surgical aortic valve replacement (AVR) for severe aortic stenosis (AS) has considerably increased in recent years. However, the association between AS etiology and mid-term clinical outcomes after surgical AVR has not been fully investigated.

Methods And Results: We retrospectively included 201 patients (mean age, 75 years; 43%, men) who underwent surgical AVR for severe native AS (aortic valve area ≤1.

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Background: The effect of diabetes mellitus (DM) status on the long-term risk for heart failure (HF) in patients undergoing coronary revascularization has not been adequately evaluated.

Methods and results: In this study, 15,231 patients who underwent coronary revascularization in the CREDO-Kyoto Registry Cohort-2 were divided into 2 groups according to DM status (DM group: n=5,999; Non-DM group: n=9,232). The DM group was further divided into 2 groups according to insulin treatment (insulin-treated DM [ITDM]: n=1,353; non-insulin-treated DM [NITDM]: n=4,646).

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Background: Atrial fibrillation (AF) is the most common arrhythmia in patients undergoing percutaneous coronary intervention (PCI).

Hypothesis: Large administrative data may provide further insight into temporal trends in the prevalence and burden of AF in patients who underwent PCI.

Methods: Using the National Inpatient Sample database in the U.

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Background: Transcatheter aortic valve implantation (TAVI) is an innovative and effective treatment in high-surgical-risk (HR) and inoperable patients with symptomatic severe aortic stenosis.

Objectives: This cost-effectiveness analysis of transfemoral TAVI (TF-TAVI) compared with surgical aortic valve replacement (SAVR) conforms with the methodological guidelines for cost-effectiveness evaluation by the Ministry of Health, Labor, and Welfare in Japan.

Methods: The cost-effectiveness of TF-TAVI using SAPIEN XT was evaluated using a lifetime Markov simulation from the national payer perspective.

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Background: In patients with severe coronary artery disease (CAD) requiring coronary revascularization, the prevalence of surgical ineligibility and its clinical effect on long-term outcomes remain unclear.

Methods and results: Among 15,939 patients with first coronary revascularization in the CREDO-Kyoto percutaneous coronary intervention (PCI)/coronary artery bypass grafting (CABG) registry cohort-2, we identified 3,982 patients with triple-vessel or left main disease (PCI: n=2,188, and CABG: n=1,794). Surgical ineligibility as documented in hospital charts was present in 142 (6.

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Objective: To assess long-term outcomes after percutaneous coronary intervention (PCI) with drug-eluting stent only compared with coronary artery bypass grafting (CABG) in patients with triple-vessel disease.

Background: Selection between PCI and CABG is still a clinically relevant issue in the management of patients with multi-vessel coronary artery disease.

Methods: Among 15,939 patients enrolled in the CREDO-Kyoto PCI/CABG registry/cohort-2, the current study population consisted of 2,193 patients who underwent elective multi-vessel coronary revascularization including left anterior descending coronary artery (LAD) either by PCI with sirolimus-eluting stent (SES) only (N = 945) or CABG (N = 1,248).

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Objective: Severe aortic stenosis (AS) is one of the most serious valve conditions. Patient demography and the aetiology of AS have substantially changed in the past several decades along with a drastic improvement of surgical aortic valve replacement (SAVR) and its associated procedures. Contemporary patients with severe AS have multiple comorbidities and live much longer.

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Background The contemporary incidence of and reasons for early readmission after infective endocarditis ( IE ) are not well known. Therefore, we analyzed 30-day readmission demographics after IE from the US Nationwide Readmission Database. Methods and Results We examined the 2010 to 2014 Nationwide Readmission Database to identify index admissions for a primary diagnosis of IE with survival at discharge.

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The mechanism of reduced stroke volume index (SVi) in paradoxical low-flow, low-pressure gradient (PLFLPG) aortic stenosis (AS) remains unclarified. Guyton et al. ( 21 ) demonstrated that SVi is determined by whole body O consumption (V̇o) in many subjects, including patients with heart disease.

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Background: Readmissions after in-hospital cardiopulmonary resuscitation (ICPR) are common and contribute to increased health care utilization and costs. This study aimed to estimate the burden and patterns of 30-day readmission after ICPR from the US Nationwide Readmission Database (NRD).

Methods: Using International Classification of Diseases-Ninth Revision-Clinical Modification codes, patients who underwent ICPR in the 2014 NRD were included.

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The hemodynamics and outcomes in patients with a small aortic annulus (SAA) after transcatheter aortic valve replacement (TAVR) with a second-generation transcatheter heart valve remain unclear. We investigated whether TAVR with a Sapien XT (Edwards Lifesciences, Irvine, California) influences postprocedural valve hemodynamics and long-term outcome in high-risk SAA patients compared with surgical aortic valve replacement (SAVR).We retrospectively identified 94 SAA patients who underwent aortic valve replacement (TAVR = 35 and SAVR = 59).

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Background: There is no large-scale study comparing postoperative mortality after aortic valve replacement (AVR) for asymptomatic severe aortic stenosis (AS) between initial treatment with AVR vs. eventual AVR after conservative management.

Methods and results: We analyzed data from a multicenter registry enrolling 3,815 consecutive patients with severe AS.

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Background: Basal interventricular septum (IVS) hypertrophy (BSH) with reduced basal IVS contraction and IVS-aorta angle is frequently associated with aortic stenosis (AS). BSH shape suggests compression by the longitudinally elongated ascending aorta, causing basal IVS thickening and contractile dysfunction, further suggesting the possibility of aortic wall shortening to improve the BSH. Surgical aortic valve replacement (SAVR), as opposed to transcatheter AVR (TAVR), includes aortic wall shortening by incision and stitching on the wall and may potentially improve BSH.

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Aims: Tricuspid regurgitation (TR) has been reported to be associated with worse survival in various heart diseases, but there are few data in aortic stenosis (AS).

Methods And Results: In the Contemporary Outcomes after Surgery and Medical Treatment in Patients with Severe Aortic Stenosis (CURRENT AS) Registry enrolling 3815 consecutive patients with severe AS, there were 628 patients with moderate or severe TR (TR group) and 3187 patients with no or mild TR (no TR group). The study patients were subdivided into the initial aortic valve replacement (AVR) stratum (n = 1197) and the conservative stratum (n = 2618) according to treatment strategy.

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