Publications by authors named "Oka A"

Purpose: Infantile epileptic spasms syndrome (IESS) often has a severe neurodevelopmental prognosis. However, few studies have examined the aspect of elementary school enrollment. This study evaluated elementary school enrollment after adrenocorticotropic hormone (ACTH) therapy in patients with IESS.

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Amiodarone is an antiarrhythmic drug that is widely used for atrial fibrillation and other refractory arrhythmias. Although beneficial, its long-term administration is associated with adverse effects on various organs. One patient presented with amiodarone-induced liver injury, which led to liver failure.

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Background: Myocarditis is associated with an increased risk of conduction disturbances during the acute phase, which recovers in most cases but rarely recurs during the chronic phase.

Case Summary: A 50-year-old man who developed fulminant myocarditis after COVID-19 mRNA vaccination was discharged 24 days after admission. He was readmitted for heart failure associated with two P waves: one P wave (P1) had a normal amplitude and was dissociated from the QRS, and the other (P2) had a very low amplitude and was associated with the QRS.

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Background: Chronic rhinosinusitis with nasal polyps (CRSwNP) is characterized by type 2 (T2) inflammation. Recent studies, including our own, suggest that neutrophils are also elevated in T2 nasal polyps (NP) and that elevated neutrophils display an activated phenotype. However, the actual roles of neutrophils in NP pathogenesis in T2 CRSwNP are still largely unclear.

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The sulfate transporter gene SLC26A2 is crucial for skeletal formation, as evidenced by its role in diastrophic dysplasia, a type of skeletal dysplasia in humans. Although SLC26A2-related chondrodysplasia also affects craniofacial and tooth development, its specific role in these processes remains unclear. In this study, we explored the pivotal roles of SLC26A2-mediated sulfate metabolism during tooth development.

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Purpose: Epileptic spasms are the primary symptom of infantile epileptic spasms syndrome (IESS); however, their direct impact on blood-brain barrier (BBB) function is unknown. Matrix metallopeptidase-9 (MMP-9), degrades type IV collagen, a key component of the blood-brain barrier, while tissue inhibitor of metalloproteinase-1 (TIMP-1) suppresses its activity, protecting BBB integrity. This study aimed to assess serum MMP-9 and TIMP-1 levels in patients with IESS of unknown etiology.

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Purpose: Infantile epileptic spasms syndrome (IESS) with epileptic spasms as the main seizure type, is treated with adrenocorticotropic hormone (ACTH). This study, for the first time, examines the effects of epileptic spasms and ACTH on blood-brain barrier (BBB) permeability in patients with IESS of unknown etiology.

Methods: We prospectively evaluated the changes in BBB permeability in patients with IESS of unknown etiology at the Saitama Children's Medical Center between February 2012 and February 2024.

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Article Synopsis
  • Congenital cytomegalovirus (cCMV) infection is the most prevalent congenital infection in developed nations, and while there’s no established standard therapy yet, management evidence is growing.
  • The first edition of the "Clinical Practice Guidelines for the Management of Congenital Cytomegalovirus Infection" was published in Japan in 2023, outlining key clinical questions related to cCMV.
  • The guidelines cover 20 clinical questions on aspects like prenatal risk assessment, diagnosis, treatment, and follow-up, along with recommendations and consensus rates to aid healthcare providers in managing cCMV patients.
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  • A study in Japan examined pediatric patients aged 0-19 who died from SARS-CoV-2 infection between January and September 2022, identifying 62 cases and analyzing detailed medical information from 53 of those patients.
  • Of the patients with internal causes of death, 15% were infants under 1 year old, 59% had no underlying health conditions, and 88% of those eligible for vaccination had not been vaccinated.
  • Key findings showed that 46% experienced out-of-hospital cardiac arrest, nonrespiratory symptoms were more prevalent than respiratory symptoms, and the primary suspected causes of death were central nervous system and cardiac abnormalities; the study emphasizes close monitoring of pediatric patients in the week following symptom onset
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Unlabelled: The industrial amino acid production workhorse, Corynebacterium glutamicum naturally produces low levels of 2,3,5,6-tetramethylpyrazine (TMP), a valuable flavor, fragrance, and commodity chemical. Here, we demonstrate TMP production (∼0.8 g L-1) in C.

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  • - A man in his 30s was referred for evaluation of bile duct stricture and an intrahepatic bile duct stone, five years after having surgery for a massive liver tumor (hemangioma).
  • - Imaging tests showed multiple defects in his bile duct, and an endoscopic ultrasound revealed a raised lesion, leading to concerns about a potential tumor.
  • - A diagnosis of intraductal papillary neoplasm (low-grade dysplasia) was confirmed through oral cholangioscopy, which showed no progression of the lesion over 1.5 years.
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  • Lower serum eicosapentaenoic acid (EPA) to arachidonic acid (AA) ratios are linked to cardiovascular events, while high EPA levels increase the risk of new atrial fibrillation (AF) in older patients.
  • A study of patients aged 65 and older undergoing AF ablation showed that those with high EPA/AA ratios experienced more AF recurrence (39.3% versus 27.6%) but fewer major adverse cardiovascular events (MACE; 13.8% versus 25.5%).
  • Ultimately, a higher EPA/AA ratio was found to be a strong predictor for both AF recurrence and a lower rate of MACE among older patients after AF ablation.*
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  • A study evaluated the use of intravenous lacosamide in treating cluster seizures in 25 pediatric patients, finding that 48% showed a positive response with seizure freedom lasting at least 12 hours.
  • Among those treated as a first-line therapy, 52.9% achieved complete seizure remission, particularly in patients with remote causes.
  • No adverse events were reported, suggesting lacosamide therapy could be a safe and effective option for managing cluster seizures in children.
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  • Chronic rhinosinusitis with nasal polyps (CRSwNP) involves complex inflammation, and the specific functions of eosinophils in this condition are not well understood.
  • Researchers used single-cell RNA sequencing to analyze eosinophils in nasal polyp tissue from patients with CRSwNP, comparing them to control samples.
  • The study identified a diverse range of eosinophil subtypes in nasal polyps, with certain genes related to inflammation and cell growth being significantly upregulated, suggesting their key role in CRSwNP pathology.
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  • Whole exome sequencing was performed on affected sibling pairs and their parents to identify harmful single nucleotide variants (SNVs) connected to EDs, with two significant non-synonymous SNVs discovered in genes related to neurotransmitter systems.
  • The identified variants in the corticotropin-releasing hormone receptor 2 and glutamate metabotropic receptor 8 may contribute to the biological understanding of EDs, potentially guiding future treatments and insights into their development.
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Novel therapeutic strategies are urgently required for osteosarcoma, given the early age at onset and persistently high mortality rate. Modern transcriptomics techniques can identify differentially expressed genes (DEGs) that may serve as biomarkers and therapeutic targets, so we screened for DEGs in osteosarcoma. We found that osteosarcoma cases could be divided into fair and poor survival groups based on gene expression profiles.

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  • The study aimed to analyze gene expression in the middle ear mucosa of two patients with eosinophilic otitis media.
  • One patient, who experienced severe hearing loss, had elevated levels of genes related to IL-5 and IL-33 receptors.
  • These findings suggest a potential link between specific gene expressions and the severity of symptoms in eosinophilic otitis media.
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Introduction: Autosomal dominant hypophosphatemic rickets (ADHR) is caused by pathogenic variants in the fibroblast growth factor 23 (FGF23) gene, which plays a key role in the regulation of phosphorus metabolism. FGF23 has the RXXR motif recognized by furin, leading to cleavage between R179 and S180 and thereby inactivating the protein's function. Previously reported variants in FGF23 causing ADHR occurred only affecting residues R176 or R179, which are located in the RXXR motif, leading to impaired cleavage.

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Introduction: Insurance coverage for oral valganciclovir (VGCV) began in Japan in April 2023 on the basis of results, including our clinical trials for symptomatic congenital cytomegalovirus (CMV) disease. The VGCV treatment is available throughout Japan, so clinicians must consider the likelihood of hearing improvement and the possibility of neutropenia before dosing.

Materials And Methods: We performed a substudy of an investigator-initiated, single-arm, prospective, multicenter, clinical trial in which 24 infants with symptomatic congenital CMV disease were orally administered 16 mg/kg VGCV twice daily for 6 months as an intervention.

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Background: Superior mesenteric artery (SMA) syndrome is a rare cause of duodenal obstruction by extrinsic compression between the SMA and the aorta (SMA-Ao). Although the left lateral recumbent position is considered effective in the treatment of SMA syndrome, individual variations in the optimal patient position have been noted. In this report, we present two elderly cases of SMA syndrome that exhibited rapid recovery due to ultrasonographic dynamic evaluation of the optimal position for each patient.

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Background: Endothelial dysfunction (ED), a well-established risk marker of cardiovascular events, is associated with heart failure (HF) and atrial fibrillation (AF). Its relationship with cardiovascular events in patients with HF undergoing AF ablation remains unclear. We aimed to elucidate the association between ED and the outcomes after AF ablation in patients with HF.

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