Publications by authors named "Ryuichi Sada"

Objective Rheumatoid pleural effusion (RPE) usually occurs in middle-aged men. Pleural fluid analyses have revealed high lactate dehydrogenase (LDH) levels and low pH and glucose levels in RPE. We aimed to investigate the clinical and laboratory features of patients with RPE since the beginning of the 21st century.

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  • Recent clinical trials on the effect of CPC mouthwashes on SARS-CoV-2 viral load in COVID-19 patients showed inconsistent results, and no studies have tested on-demand chlorine dioxide mouthwash.
  • A randomized, placebo-controlled trial was conducted with 90 COVID-19-positive participants to compare the efficacy of 0.05% CPC, 0.01% aqueous chlorine dioxide, and a placebo on salivary viral load.
  • Results indicated neither mouthwash significantly decreased the viral load compared to placebo across various time points, suggesting both mouthwashes are not effective in reducing salivary SARS-CoV-2 levels.
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Hydroxychloroquine (HCQ) use is indicated for patients with systemic lupus erythematosus (SLE). Nevertheless, reports discussing the reasons for not prescribing HCQ are limited. We identified the factors that interfere with HCQ use in patients with SLE.

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  • * A study at Osaka University Hospital found 5 cases of C. butyricum bacteremia out of over 6,500 patients, mainly affecting those with weakened immune systems, with symptoms like fever and abdominal pain.
  • * Genome sequencing confirmed that all strains causing bacteremia were derived from probiotics, highlighting the need for careful prescription of such products in hospitalized patients to mitigate risks.
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  • The study investigates the effectiveness of the Sternheimer stain, a common qualitative urinalysis method in Japan, to identify bacteriuria compared to the Gram stain.
  • It included 342 patients with pyuria from a larger group of 986 emergency room patients, analyzing the sensitivity and specificity of both staining methods against urine culture results.
  • Findings showed that the Sternheimer stain has a sensitivity of 92.2% but a lower specificity of 48.5%, making it a quick tool for ruling out bacteriuria in patients with pyuria.
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Streptococcal toxic shock syndrome (STSS) has a dramatic clinical course and high mortality rate. Here, we report a case of STSS complicated by primary peritonitis and bilateral empyema. A previously healthy young woman was diagnosed with STSS complicated by primary peritonitis and bilateral empyema.

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  • A study is investigating the effectiveness of mouthwashes containing cetylpyridinium chloride (CPC) and on-demand aqueous chlorine dioxide (ACD) in reducing SARS-CoV-2 levels in saliva for people with mild COVID-19 symptoms.
  • The clinical trial will involve 90 participants split into three groups (CPC mouthwash, ACD mouthwash, and placebo), with participants using the mouthwash for a week or until recovery.
  • Saliva samples will be collected at various times and analyzed to measure changes in viral load, with the primary focus on changes 2 hours after initial mouthwash use.
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Background: Extended-spectrum β-lactamase (ESBL)-producing Enterobacterales have become a global concern owing to increased infections, high mortality, and limited antibiotic treatment options. Carbapenems (CPMs) are effective against ESBL-producing Enterobacterales, but their overuse leads to the emergence of multidrug-resistant bacteria. Cefmetazole (CMZ) is effective in vitro; however, its clinical efficacy remains unclear.

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An 84-year-old man in Japan who had undergone endovascular aortic repair 9 years earlier had an infected aneurysm develop. We detected Desulfovibrio desulfuricans MB at the site. The patient recovered after surgical debridement, artificial vessel replacement, and appropriate antimicrobial therapy.

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Using the Fukushima accident experience, this letter discusses recent efforts on measuring scientific consensus views-that is, quantifying the agreement among scientists. In the field of radiological protection, the efforts to measure scientific consensus views deserve attention, because hoaxes have been spreading even after the Fukushima nuclear accident. We discussed two points.

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Objective: This study aimed to identify factors associated with polypharmacy, including social aspects, among patients with rheumatoid arthritis.

Methods: We conducted this single-centre, cross-sectional study at a 715-bed regional tertiary care teaching hospital in Japan from 1 September to 30 November 2020. Polypharmacy was defined as having five or more medications administered orally regularly, and excessive polypharmacy was defined as having 10 or more medications administered orally regularly.

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Objectives: We aimed to investigate the vaccination coverage and the factors associated with non-vaccination for vaccine-preventable diseases among patients with rheumatoid arthritis.

Methods: This single-centre, cross-sectional study was conducted in a 715-bed regional tertiary-care teaching hospital in Japan from 1 September to 30 November 2020. Vaccination status and the factors and reasons for not receiving the influenza vaccine, 23-valent pneumococcal polysaccharide vaccine (PPSV23), 13-valent pneumococcal conjugate vaccine (PCV13), and varicella vaccine live (VVL) were investigated.

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Objectives: This study aimed to clarify factors associated with polypharmacy among patients with systemic lupus erythematosus.

Methods: This single-centre cross-sectional study was conducted by reviewing the medical records and questionnaire data of 261 systemic lupus erythematosus patients at a teaching hospital in Japan from 1 September to 30 November 2020. Polypharmacy was defined as the regular administration of five or more oral medications; excessive polypharmacy consisted of the regular use of 10 or more oral medications.

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TAFRO syndrome is a rare disorder that manifests as thrombocytopenia, anasarca, fever, reticulin myelofibrosis, renal dysfunction, and organomegaly. Although this disease often follows a severe clinical course, the cause remains unknown. The coronavirus disease 2019 (COVID-19) pandemic is a major global problem.

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Introduction: Surgical site infection (SSI) is associated with increased morbidity and mortality rates, postoperative length of stay (pLOS), and medical costs. In colorectal surgery, cefmetazole (CMZ) and flomoxef (FMOX) are predominantly used in Japan, and they have almost the same spectrum of antibiotic activity against SSI pathogens, and an approximately four-fold cost difference (CMZ: ∼4$, FMOX: ∼16$). However, the difference between these antibiotics in SSI prophylaxis in colorectal surgery remains poorly understood.

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Aim: The emergency department requires simple and useful clinical indicators to identify bacteremia. This retrospective study explored the Systemic Inflammatory Response Syndrome (SIRS) and quick Sequential Organ Failure Assessment (qSOFA) scores for predicting bacteremia.

Methods: Between April and September 2017, we assessed blood cultures of 307 patients in our emergency department.

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Background: Research engagement contributes to the improvement of patient care. A systematic review is a suitable first scholarly activity because it entails summarization of publicly available data and usually requires neither rigorous ethical review nor research funding.

Methods: This study aimed to develop a model workshop for healthcare staff to acquire skills in creating systematic review protocols based on their own clinical questions at teaching hospitals.

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During the influenza season, most patients suspected of having influenza undergo rapid influenza diagnostic tests (RIDTs) in Japan despite their low sensitivity. However, the physician's actual rationale for prescribing antivirals, besides the results of RIDTs, remains poorly understood. Our study sought to identify the role of clinical information and physicians' experience in the initiation of anti-influenza agents.

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Lupus aortitis is a rare and potentially life-threatening disorder. Previous studies have reported the utility of high-dose systemic glucocorticoids or surgery as the treatment, although there have been no related controlled trials. We herein report a 49-year-old woman with a 35-year history of systemic lupus erythematosus who was diagnosed with aortitis.

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Background: Community-onset pneumonia (COP) is a combined concept of community acquired pneumonia and the previous classification of healthcare-associated pneumonia. Although ceftriaxone (CRO) is one of the treatment choices for COP, it is unclear whether 1 or 2 g CRO daily has better efficacy. We compared the effectiveness of 1 g with 2 g of CRO for COP treatment.

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Community-acquired methicillin-resistant has been spreading worldwide, including in Japan. However, few cases of toxic shock syndrome caused by Community-acquired methicillin-resistant have been reported in Japan. We report 2 cases, in middle-aged women, of toxic shock syndrome due to Community-acquired methicillin-resistant via a vaginal portal of entry.

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