Publications by authors named "Yusuke Asai"

Oxy-hydroxides represent potential proton carriers for solid acid catalysts and proton conductors owing to their hydroxide-rich compositions. However, their applications in high-temperature environments are limited due to thermal instability associated with dehydration at moderate to high temperatures. Therefore, the development of oxy-hydroxides with enhanced thermal stability is of critical importance.

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Aims: Inflammatory bowel disease is characterized by various cytokine patterns. In this study, we aimed to investigate the markers that can distinguish Th1/Th2 cytokines in patients with inflammatory bowel disease.

Methods And Results: In patients with inflammatory bowel disease treated at our hospital, the Th1/Th2 ratio (interferon-γ/interleukin-4 ratio), serum immunoglobulin E level, leucine-rich alpha 2 glycoprotein level, serum amyloid A level, and leukocyte fraction were measured simultaneously, and the relationship between them was examined.

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The catalytic reduction of CO into value-added chemicals has become important in recent years, and a catalyst that is efficient, nontoxic, and inexpensive is highly demanded. In particular, room still exists for exploring mixed-anion compounds as new catalysts. Here, we show that the Zn-based mixed-anion compounds Zn(OH)(NO) and Zn(OH)(NO), which were formed on the surface of AlO using Zn(NO)·6HO as the precursor, can convert CO into HCOOH with >80% selectivity in the presence of a Ru(II) photosensitizer and 1-benzyl-1,4-dihydro-nicotinamide as an electron donor under visible light ( = 460 nm).

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Objective: This study aimed to identify the factors associated with the use of penicillins as the first-choice antimicrobial in Japan's dental clinics.

Design: Cross-sectional questionnaire-based survey.

Setting: Dental clinics throughout Japan.

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End-of-life decision making regarding invasive mechanical ventilation (IMV) for patients with severe coronavirus disease (COVID-19) is challenging. We aimed to explore the factors associated with the withholding of IMV in patients with COVID-19. This retrospective study included patients registered in a nationwide COVID-19 Registry Japan.

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Introduction: Women are more often prescribed antibiotics than men for a number of health conditions. Adults' behaviours in engaging with healthcare for themselves, especially when attending appointments with a child with a respiratory tract infection for whom they provide care, may contribute to the gender differences in antimicrobial use. This study aimed to evaluate gender differences in caregivers' attendance at healthcare visits for children with respiratory tract infections, their behaviours in engaging with healthcare for themselves and their children, and associated antibiotic prescriptions.

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The diagnostic performance and clinical utility of fecal calprotectin (FC), fecal immunochemical occult blood test (FIT), leucine-rich alpha-2 glycoprotein (LRG), C-reactive protein (CRP), and prostaglandin E-major urinary metabolite (PGE-MUM) as established biomarkers for ulcerative colitis (UC) were evaluated. Significant correlations were observed between the clinical activity index, Mayo endoscopic subscore (MES), and each biomarker. Among MES groups, fecal biomarkers demonstrated significant differences, except between MES 2 and MES 3.

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Interleukin-17 (IL-17) has been suggested to have a protective effect on the intestinal mucosa. The administration of an anti-IL-17 receptor monoclonal antibody has been associated with the onset of inflammatory bowel disease. We present a case of ulcerative colitis caused by secukinumab, an anti-IL-17 receptor A monoclonal antibody, that was treated with mirikizumab, a p19-directed antibody against IL-23.

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Background: The goal of treatment for Crohn's disease (CD) is to achieve mucosal or transmural healing, and biomarker measurements are useful in monitoring disease activity and guiding treatment. This study aimed to investigate the utility of a new urinary biomarker, prostaglandin E-major urinary metabolite (PGE-MUM), in assessing CD activity.

Methods: The study involved 87 patients with CD who underwent endoscopic examination and measurements of 4 biomarkers: Prostaglandin E-major urinary metabolite, fecal calprotectin (FC), leucine-rich α2 glycoprotein (LRG), and C-reactive protein (CRP).

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Fecal calprotectin (FC) is a Crohn's disease (CD) biomarker, although the impact of disease duration on its accuracy remains unclear. This study was aimed at investigating the effects of CD disease duration on FC. In this prospective, single-center, cross-sectional study, we performed 113 endoscopies and biomarker measurements.

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Background: In real-world clinical settings, the clinical efficacy of vedolizumab (VDZ) in patients with ulcerative colitis (UC) remains unclear. In this study, we aimed to evaluate the efficacy of prednisolone (PSL)-VDZ combination therapy in patients with UC.

Methods: Changes in the clinical activity index (CAI), blood test results, and the factors affecting VDZ rate and continuity were investigated.

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Background: We examined the association between the COVID-19-specific prefectural bed utilization rate and in-hospital mortality during the first three years of the pandemic in Japan.

Methods: This nationwide study included 58,175 COVID-19 patients from the COVID-19 Registry Japan, hospitalized between May 1, 2020 and November 30, 2022. Based on the weekly COVID-19-specific bed utilization rate in each prefecture at diagnosis, patients were categorized into four groups (< 25%, 25% to < 50%, 50% to < 75%, and ≥ 75%).

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Introduction: Horse kicks are a rare cause of injury and tend to cause severe complications such as visceral organ injury. Traumatic duodenal injuries are associated with high mortality rates. Furthermore, their reconstructive procedures vary widely and require appropriate on-the-spot judgment by the surgeon.

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Background And Objectives: Carbapenem-resistant Gram-negative bacilli (CRGNB), especially and , are critical pathogens associated with excess morbidity and mortality. To elucidate their molecular epidemiology and clinical outcomes in Japan, patients with CRGNB were enrolled in the MDR organisms clinical research network (MDRnet) consisting of eight tertiary care facilities.

Methods: Between 2019 and 2022, 246 unique patients with carbapenem-resistant (CRE), carbapenem-resistant (CRPA) and carbapenem-resistant (CRAB) isolates were prospectively enrolled.

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Objective: The duration of viral shedding and criteria for de-isolation in the hospital among immunocompromised patients with coronavirus disease 2019 (COVID-19) remain unclear. This study aimed to evaluate viral shedding duration in immunocompromised patients infected with the Omicron variant of severe acute respiratory syndrome coronavirus 2.

Methods: A prospective cohort study was performed at 2 tertiary medical centers in Japan during the Omicron epidemic waves from July 2022 to January 2023.

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Objectives: The COVID-19 pandemic was associated with a global decrease in antimicrobial consumption (AMC) in 2020. However, the persistence of this downwards trend is not known at a global level. This study examined the global and longer-term trends in AMC after the emergence of COVID-19.

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Article Synopsis
  • This study investigates esophageal squamous cell carcinoma (ESCC) by examining its occurrence in both longitudinal and circumferential positions, focusing on lesions removed via endoscopic submucosal dissection (ESD).
  • Researchers analyzed 193 ESCC lesions and found that the anterior wall of the esophagus had smaller median tumor sizes and a higher proportion of early-stage, superficial lesions compared to other locations.
  • Despite being less common, lesions on the anterior wall were more likely to be small and only invade the epithelial layer, indicating unique characteristics compared to lesions in other positions.
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Background: Ulcerative colitis (UC) causes extensive ulceration attributable to intestinal inflammation. This study investigated the effect of past extensive ulcers (PEUs) on fecal calprotectin (FC).

Methods: This retrospective, single-center, observational study included patients with UC with a Mayo endoscopic subscore of 0.

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  • Co-infection with other viruses can worsen the severity of COVID-19 in children, but research on this topic is still limited, particularly in the context of the Omicron variant.
  • A study of 245 hospitalized pediatric COVID-19 patients found that 31.8% had co-infections, mainly with enterovirus/rhinovirus, and these patients exhibited more respiratory symptoms and a higher need for oxygen support.
  • The analysis identified co-infection and existing comorbidities as significant risk factors for requiring oxygen therapy in these pediatric patients.
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This study affords mechanistic insights into the formation mechanism of carbodiimide ions (NCN) from urea during the synthesis of LaONCN by employing the "proanion" strategy without using NH gas. It is a safer, cost-effective, and environmentally friendly approach. Urea, acting as a proanion, decomposes upon heating, facilitating conversion to NCN.

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Background: Evaluating the selective pressure of antimicrobials on bacteria is important for promoting antimicrobial stewardship programs (ASPs). The aim of this study was to assess the selective pressure of antimicrobials by evaluating their use (carbapenem [CBP] and CBP-sparing therapy) over time and the detection status of CBP-resistant organisms using multicenter data.

Methods: Among the facilities whose data were registered in the Japan Surveillance for Infection Prevention and Healthcare Epidemiology from 2017 to 2020, those that had data on the use of CBP and CBP-sparing therapy (fluoroquinolones [FQs], cefmetazole [CMZ], piperacillin-tazobactam [PIP/TAZ], ampicillin-sulbactam [ABPC/SBT], ceftriaxone/cefotaxime [CTRX/CTX], CAZ (ceftazidime), cefepime [CFPM], and aminoglycosides [AGs]) as well as on CBP-resistant Enterobacterales (CRE) and CBP-resistant Pseudomonas aeruginosa (CRPA) detection were included.

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Background The report of epidemiological data on coronavirus disease 2019 (COVID-19) patients treated using extracorporeal membrane oxygenation (ECMO) in Japan has been limited. Our study seeks to fill the existing gap in knowledge by providing an in-depth analysis of the clinical epidemiological characteristics and diverse medical outcomes of COVID-19 patients treated with ECMO in Japan. Methods This study used the COVID-19 Registry Japan nationwide database.

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Article Synopsis
  • * While the overall improvement in Crohn's disease activity was not significant after 48 weeks, patients with only small intestine lesions showed notable progress in their condition and improved albumin levels.
  • * Treatment retention rates were high for both groups, indicating ustekinumab is a safe and effective option, particularly for those with small intestinal lesions.
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  • The omicron variant has been responsible for nearly all new COVID-19 cases in Japan since February 2023, leading the government to prioritize preventing the spread while maintaining socioeconomic activities.
  • The focus is on protecting vulnerable populations like pregnant women and the elderly, and addressing those who require hospitalization without imposing new social restrictions.
  • The review explores the ongoing issues of late disease awareness and proposes a urine analysis method for early detection of severe illness risk, highlighting its potential for drug discovery and development.
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Article Synopsis
  • - This study explores the effectiveness of antibody testing for assessing immunity and diagnosing conditions like multisystem inflammatory syndrome related to COVID-19, focusing on antibodies targeting the SARS-CoV-2 spike protein.
  • - Researchers measured the neutralizing activity of immunoglobulin-G (IgG) in COVID-19 convalescent patients, finding a strong correlation between serum neutralizing activity (IgG-EC) and specific antibodies (S-IgG).
  • - The findings suggest that quantitative S-IgG tests can reliably estimate neutralizing antibody activity, provided the cut-off values for interpreting results are carefully established for accuracy.
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