Publications by authors named "Ohya M"

Background: Sodium-glucose cotransporter 2 (SGLT2) inhibitors have been shown in clinical trials to increase serum Mg levels in patients with type 2 diabetes mellitus. However, it is unclear whether this effect is similarly observed in patients with chronic kidney disease (CKD) and whether such an increase is observed immediately after treatment.

Methods: Our retrospective observational study included the 62 patients with CKD who started SGLT2 inhibitor therapy at our institution between 2017 and 2022 and who had complete data on serum Mg measurements at baseline and at 1, 3, and 6 months after treatment.

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  • A study investigated the effects of high-risk coronary artery plaques on late luminal narrowing and clinical events in patients after percutaneous coronary intervention.
  • Over one year, the coronary artery lumen area decreased notably, especially in specific types of plaques, such as thin-cap and thick-cap fibroatheromas.
  • Thin-cap fibroatheroma presence was linked to a higher risk of needing further revascularization procedures after ischemia, while no significant connection was found between coronary artery calcium levels and clinical outcomes within three years.
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Introduction: Lung adenocarcinoma with parathyroid hormone (PTH)-related hypercalcemia is uncommon.

Case Presentation: A 69-year-old man was admitted to our hospital due to anorexia and fatigue. Serum calcium (15.

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There are numerous approaches for transcatheter aortic valve replacement (TAVR); however, access-related complications remain a point of concern. We analyzed consecutive patients who underwent TAVR for severe aortic stenosis via the brachiocephalic artery (BCA) without sternotomy (TBc group, n = 10) and via the trans-ascending aortic (TAo group, n = 8). The median BCA diameter and distance between the access point and suprasternal notch or superior margin of the clavicle were 11.

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  • The study reports two cases of gastric cancer (GC) patients with elevated serum levels of a biomarker, Krebs von den Lungen-6 (sKL-6), who were treated with SOX chemotherapy, which combines oxaliplatin and S-1.
  • The first patient, a 79-year-old woman, showed a significant reduction in both her tumor and sKL-6 levels after chemotherapy, remaining metastasis-free for 72 months despite experiencing interstitial pneumonia later on.
  • The second patient, a 69-year-old woman, also had a decrease in tumor size and sKL-6 levels after receiving SOX therapy combined with trastuzumab, indicating potential effectiveness of the treatments despite high initial biomarker levels
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  • Acute coronary syndrome (ACS) includes conditions like myocardial infarction (MI) and unstable angina (UA), but diagnosing them early remains challenging due to delayed elevation of cardiac markers like troponin.
  • A study analyzed the potential of serum nardilysin (NRDC) as a biomarker for early ACS detection by involving two patient cohorts, finding that NRDC levels were significantly higher in ACS patients compared to those without.
  • The study showed that NRDC had better sensitivity for ACS diagnosis within 6 hours of symptom onset than traditional markers and could aid in diagnosing patients who test negative for troponin, strengthening its role when used alongside hsTnI.
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A 34-year-old Japanese man presented with blurred vision, headache, nausea, anemia, thrombocytopenia, and severe renal dysfunction. Thrombotic microangiopathy was initially suspected to have been caused by malignant hypertension. Antihypertensive medications did not improve his thrombocytopenia or renal dysfunction, and other diseases causing thrombotic microangiopathy were ruled out.

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  • This study investigated long-term outcomes of alcohol septal ablation (ASA) in 44 Japanese patients with hypertrophic obstructive cardiomyopathy from 1998 to 2022.
  • ASA significantly reduced the left ventricular outflow tract pressure gradient and decreased the incidence of moderate or severe mitral regurgitation (MR) post-procedure.
  • After a median follow-up of 6 years, moderate or severe MR post-ASA was linked to higher risks of cardiovascular death and heart failure hospitalization; all-cause mortality was 15.1% and 28.9% at 5 and 10 years, respectively.
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Background: Pulmonary arteriovenous malformations (PAVMs) are abnormal communications between the pulmonary arteries and veins; right-to-left shunts can cause hypoxaemia, emboli to systemic circulation, and brain abscesses. Cyanosis during pregnancy may increase the probability of premature birth or spontaneous abortion and may increase maternal cardiac complications.

Case Summary: We describe a case of a 24-year-old woman with diffuse multiple PAVMs localized to the left inferior lobe and chronic cyanosis.

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  • This study investigated the outcomes of intravascular ultrasound (IVUS)-guided percutaneous coronary intervention (PCI) in patients with multivessel disease, focusing on those with different SYNTAX scores (SS).
  • It included 1,005 patients categorized into low (≤22), intermediate (23-32), and high (≥33) SS, assessing the rate of major adverse cardiac and cerebrovascular events (MACCE) after one year.
  • Results showed that patients with high SS had a significantly higher rate of MACCE compared to those with low and intermediate SS, indicating that the severity of coronary disease impacts long-term outcomes post-PCI.
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  • The study examined the link between cancer history and thrombosis in patients with second-generation drug-eluting stents, using data from the REAL-ST registry involving 1,265 patients.
  • Patients with a history of cancer had a higher prevalence of stent thrombosis (ST), particularly late and very late ST, compared to controls, although early ST did not show the same association.
  • Additionally, those with cancer history faced higher mortality rates during follow-up, underscoring the significant impact of cancer on patient outcomes after stent implantation.
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Chloride transport by microbial rhodopsins is actively being researched to understand how light energy is converted to drive ion pumping across cell membranes. Chloride pumps have been identified in archaea and eubacteria, and there are similarities and differences in the active site structures between these groups. Thus, it has not been clarified whether a common mechanism underlies the ion pump processes for all chloride-pumping rhodopsins.

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Background: Several stent expansion criteria derived from the intravascular ultrasound (IVUS) evaluation have been proposed to predict future clinical outcomes, but optimal stent expansion criteria as a guide during percutaneous coronary intervention (PCI) are still controversial. There are no studies evaluating the utility of stent expansion criteria along with the clinical and procedural factors in predicting target lesion revascularization (TLR) after contemporary IVUS-guided PCI.

Methods: OPTIVUS-Complex PCI study (Optimal Intravascular Ultrasound Guided Complex Percutaneous Coronary Intervention) multivessel cohort was a prospective multicenter study enrolling 961 patients undergoing multivessel PCI including left anterior descending coronary artery using IVUS with an intention to meet the prespecified criteria for optimal stent expansion.

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  • The study explored the impact of intravascular ultrasound (IVUS) on patient outcomes in those with multivessel disease undergoing percutaneous coronary intervention (PCI), showing it was infrequently used in past trials.
  • The OPTIVUS-Complex PCI study enrolled 1,021 patients to evaluate the effectiveness of IVUS-guided PCI, aiming to achieve optimal stent expansion based on specific criteria.
  • Results indicated a 1-year major adverse cardiac and cerebrovascular events (MACCE) rate of 10.3%, which was significantly lower than the predefined PCI goal of 27.5%, suggesting that contemporary PCI practices may lead to better outcomes in this patient group.
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Patients with chronic kidney disease develop vascular calcification, owing to impaired calcium and phosphate metabolism. The prevention of vascular calcification is important to improve the prognosis of such patients. In this study, we investigated whether treatment with FYB-931, a novel bisphosphonate compound, prevents vascular calcification in rat aortic rings cultured in high-phosphate medium for 9 days, assessed by measurement of the calcium content and the degree of calcium deposition, visualized using von Kossa staining.

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  • The OPTIVUS-Complex PCI study investigated the effectiveness of intravascular ultrasound (IVUS)-guided percutaneous coronary intervention (PCI) compared to standard PCI and coronary artery bypass grafting (CABG) in patients with multivessel coronary disease.
  • The study included 1,021 patients and analyzed outcomes through propensity score matching with historical PCI and CABG groups, focusing on major events like death and myocardial infarction.
  • Results showed that the IVUS-guided approach significantly reduced the risk of major adverse events at one year compared to both historical PCI and CABG controls, indicating better clinical outcomes.
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Acute respiratory distress syndrome (ARDS) is a serious complication of systemic inflammatory response syndrome, and diffuse alveolar damage (DAD) is a histological manifestation of ARDS. Endothelial cell injury is mainly responsible for ARDS. Many neutrophils and macrophages/monocytes, which are inflammatory cells that play a role in innate immunity, infiltrate the lung tissue in DAD.

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Objective: Postprocedural ischaemic and bleeding risks after transcatheter aortic valve replacement (TAVR) remain a major concern. Nevertheless, no reliable risk models incorporating both possibilities are currently available. We aimed to assess the accuracy of percutaneous coronary intervention (PCI)-derived models and the performance of a recalibrated model that included variables more applicable to TAVR.

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  • The study assessed how well clopidogrel works for diabetes patients after a short period of dual antiplatelet therapy during heart procedures.
  • It involved over 5,900 patients, including a significant number with diabetes, comparing the effects of 1-month vs. 12-month dual therapy.
  • Results showed no significant difference in major health risks between the two treatment durations, but those on the shorter therapy experienced less bleeding.
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Background: Data on long-term outcomes of transcatheter aortic valve replacement (TAVR) in Japanese patients beyond 5 years are limited.

Methods: Between June 2010 and December 2014, 55 consecutive inoperable or high surgical risk patients underwent TAVR with SAPIEN XT valves (Edwards Lifesciences, Irvine, CA, USA) for severe aortic stenosis at our institution. Among them, 2 patients were excluded from the analysis because one was converted to open surgery during the TAVR procedure and the other could not undergo TAVR due to device delivery failure.

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The distal radial approach (DRA) has been proposed as an alternative approach for coronary angiography (CAG) and percutaneous coronary intervention (PCI); however, the predictors of DRA failure and puncture site complications are unclear. Among 7153 consecutive patients undergoing CAG or PCI between November 2018 and January 2021, 3610 patients undergoing CAG or PCI with DRA were analyzed. The primary endpoint of this study was the procedural success, and the secondary endpoint of this study was puncture site complications during procedure.

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The long-term prognostic implication of periprocedural myocardial infarction (PMI) after coronary stent implantation in patients with diabetes mellitus (DM) remains unclear. We assessed the incidence and size of PMI and the impact of PMI on 10-year all-cause and cardiac deaths using competing risk analysis in 1,095 patients, including 453 patients with DM. All patients had normal preprocedural creatinine kinase-myocardial band levels and underwent their first elective sirolimus-eluting stent implantation for stable angina pectoris.

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Aim There are few reports on the prognostic factors associated with mortality in coronavirus disease (COVID-19) patients with critical disease. This study assessed prognostic factors associated with mortality of patients with critical COVID-19 who required ventilator management. Methods This single-center, retrospective cohort study used medical record data of COVID-19 patients admitted to an emergency ICU at a hospital in Japan between March 1, 2020 and September 30, 2021, and provided with ventilator management.

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