Publications by authors named "Tomotaro Wakamura"

Article Synopsis
  • A nationwide surveillance study in Japan assessed the antimicrobial susceptibility of bacterial pathogens related to respiratory tract infections, collecting data from June 2019 to December 2020.
  • The study analyzed 932 bacterial strains from 32 medical facilities, finding notable resistance rates, such as 35.3% for methicillin-resistant Staphylococcus aureus and 16.2% for β-lactamase-producing resistant Haemophilus influenzae.
  • Results from this surveillance aim to inform treatment strategies for respiratory infections in Japan and promote the responsible use of antimicrobial drugs.
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Acute kidney injury (AKI) often develops during the administration of liposomal amphotericin B (L-AMB), a broad-spectrum antifungal drug. However, clinical recovery approaches for AKI patients administered L-AMB are not well established. This retrospective analysis used the data obtained from hospitals throughout Japan.

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Background: Hypokalemia and acute kidney injury (AKI) occur in patients administered liposomal amphotericin B (L-AMB), a wide-spectrum anti-fungicidal drug. However, the association between potassium supplementation and the occurrence of AKI in patients with hypokalemia who were administered L-AMB is not well understood.

Methods: Using nationwide claims data and laboratory data, the occurrence of AKI during L-AMB treatment was retrospectively compared between patients with hypokalemia who were or were not supplemented with potassium and between those adequately or inadequately supplemented with potassium (serum potassium levels corrected to ≥3.

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Introduction: Liposomal amphotericin B (L-AMB), a broad spectrum anti-fungicidal drug, is often administered to treat invasive fungal infections (IFIs). However, the most suitable time to initiate treatment in septic shock patients with IFI is unknown.

Methods: Patients with septic shock treated with L-AMB were identified from the Japanese Diagnosis Procedure Combination national database and were stratified according to L-AMB treatment initiation either at septic shock onset (early L-AMB group) or after the onset (delayed L-AMB group) to determine their survival rates following septic shock onset and the shock cessation period.

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Background: Liposomal amphotericin B (L-AMB), a broad-spectrum antifungicidal drug, is often used to treat fungal infections. However, clinical evidence of its use in patients with renal dysfunction, especially those receiving renal replacement therapy (RRT), is limited. Therefore, we evaluated the usage and occurrence of adverse reactions during L-AMB therapy in patients undergoing RRT.

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Liposomal amphotericin B (L-AMB) is a broad-spectrum antifungal drug that is used to treat fungal infections. However, clinical evidence of its use in patients with renal failure is limited. Here, we aimed to identify factors associated with acute kidney injury (AKI) in patients administered L-AMB.

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Article Synopsis
  • The study is the first of its kind in Japan, surveying antimicrobial susceptibility in 246 samples from patients with various odontogenic infections, revealing high positivity rates for bacterial growth across four infection groups.
  • Streptococcus spp. and anaerobic bacteria were the main isolates, with notable resistance in Prevotella spp. to certain antibiotics due to β-lactamase production, though no resistance was found against carbapenems or metronidazole.
  • Sensitivity testing indicated that while penicillins and cephems were generally effective, Prevotella spp. required combination therapy involving β-lactamase inhibitors for better treatment outcomes.
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The nationwide surveillance on antimicrobial susceptibility of bacterial respiratory pathogens from the patients in Japan was conducted by the Japanese Society of Chemotherapy, the Japanese Association for Infectious Diseases, and the Japanese Society for Clinical Microbiology in 2016. The isolates were collected from clinical specimens obtained from well-diagnosed adult patients with respiratory tract infections during the period between February 2016 and August 2016 by three societies. Antimicrobial susceptibility testing was conducted at the central reference laboratory according to the method recommended by Clinical Laboratory Standards Institute.

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Article Synopsis
  • A nationwide surveillance study on the antimicrobial susceptibility of bacterial respiratory pathogens in Japan was conducted between January 2014 and April 2015 by three medical societies.
  • The study evaluated 1534 bacterial strains obtained from diagnosed adult patients with respiratory infections, focusing on various pathogens like Staphylococcus aureus and Streptococcus pneumoniae.
  • Results indicated high resistance rates, with 43.6% of Staphylococcus aureus being methicillin-resistant and significant percentages of Haemophilus influenzae showing resistance to ampicillin.
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Article Synopsis
  • A nationwide study in Japan in 2012 focused on monitoring the antibiotic resistance of bacterial pathogens responsible for respiratory infections in adult patients.
  • A total of 1,236 bacterial strains were tested, revealing high resistance rates, including 51.3% methicillin-resistant Staphylococcus aureus and concerning levels of antibiotic resistance in other bacteria like Klebsiella pneumoniae and Pseudomonas aeruginosa.
  • The findings highlight the importance of ongoing surveillance to understand and address the increasing resistance of bacterial respiratory pathogens to antimicrobial treatments.
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The nationwide surveillance on antimicrobial susceptibility of bacterial respiratory pathogens from patients in Japan, was conducted by Japanese Society of Chemotherapy, Japanese Association for Infectious Diseases and Japanese Society for Clinical Microbiology in 2010. The isolates were collected from clinical specimens obtained from well-diagnosed adult patients with respiratory tract infections during the period from January and April 2010 by three societies. Antimicrobial susceptibility testing was conducted at the central reference laboratory according to the method recommended by Clinical and Laboratory Standard Institutes using maximum 45 antibacterial agents.

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For the purpose of nationwide surveillance of antimicrobial susceptibility of bacterial respiratory pathogens from patients in Japan, the Japanese Society of Chemotherapy (JSC) started a survey in 2006. From 2009, JSC continued the survey in collaboration with the Japanese Association for Infectious Diseases and the Japanese Society for Clinical Microbiology. The fourth-year survey was conducted during the period from January and April 2009 by the three societies.

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