Publications by authors named "Koichi Oki"

Introduction: Acute stroke rehabilitation is crucial for achieving good functional recovery, even during the coronavirus disease 2019 (COVID-19) pandemic. This study aimed to clarify the impact of the COVID-19 pandemic on acute stroke rehabilitation and identify which components in the acute stroke rehabilitation provision system were susceptible to the pandemic.

Methods: A web-based questionnaire survey was conducted in all primary stroke centers (PSCs) in Japan between February 7 and April 21, 2022.

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Background: The Amplatzer PFO Occluder was approved for marketing in Japan in May 2019, and the Amplatzer PFO Occluder Japan Post-marketing Surveillance (PFO Japan PMS) study was initiated in December 2019. This analysis presents 30-day clinical outcomes for PFO Japan PMS study patients.

Methods And Results: PFO Japan PMS is a prospective single-arm non-randomized multicenter clinical study.

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Article Synopsis
  • The Tsuruoka Metabolomics Cohort Study (TMCS) is a large-scale, ongoing research project in rural Japan aiming to improve disease prevention strategies for complex illnesses by analyzing risk factors and predictors.
  • The study includes 11,002 participants aged 35-74 from Tsuruoka City, who provide extensive health and lifestyle data and undergo molecular profiling to identify potential disease-linked biomarkers.
  • TMCS focuses on outcomes related to cardiovascular diseases, cancer, and aging effects, utilizing a multi-omics approach to capture comprehensive biological, behavioral, and social data, and boasts a high participation rate and robust study design.
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Objectives: The early initiation of acute stroke rehabilitation with a sufficient dose, including at weekends/holidays, is important to improve functional outcome. We investigated the status of acute stroke rehabilitation in Japan by using a nationwide survey.

Materials And Methods: Facility features, rehabilitation dose provided in the first week in each stroke subtype, and weekend/holiday rehabilitation were investigated by using the results of a web-based survey among primary stroke centers.

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Introduction: Soluble C-type lectin-like receptor 2 (sCLEC-2) is a new biomarker for platelet activation, which can be easily measured by usual blood collection. We conducted the CLECSTRO, a prospective, observational cohort study, to evaluate the clinical implications of sCLEC-2 in patients with acute ischaemic stroke (AIS) and transient ischaemic attack (TIA).

Methods And Analysis: The participants are patients with AIS/TIA and control patients required for differentiation from AIS/TIA.

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Introduction: Many guidelines now recommend early rehabilitation for acute stroke patients. However, evidence remains lacking regarding the specific timings for initiation of various rehabilitation steps and management when complications are encountered in acute stroke rehabilitation. This survey aimed to investigate actual clinical situations in acute stroke rehabilitation in Japan and to improve the medical systems for rehabilitation and plan further studies.

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A 76-year-old man was admitted to our hospital with Guillain-Barré syndrome (GBS), presenting with facial palsy, dysarthria, and dysphagia as Grade 3 immune-related adverse events (irAEs) due to pembrolizumab administration for Stage IV lung adenocarcinoma. Although prednisolone (1 mg/kg) was started for GBS due to the irAE, dark erythema and skin eruptions appeared on the patient's torso. Then erosion was observed on 18% of the body surface area and skin biopsy was performed.

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We herein report a 70-year-old man with recurrent multiple cerebral infarctions under warfarin therapy who was finally diagnosed with Trousseau's syndrome resulting from advanced bladder cancer. A histological examination of the mesenteric lymph nodes revealed metastasis of micropapillary urothelial cancer with positive mucin markers CA125 and MUC1. Blood examinations also indicated elevated tumor markers, such as CA19-9 and CA125.

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Objective: The purpose of the present study is to report the clinical characteristics of polyradiculoneuropathy induced by immune checkpoint inhibitors (ICIs).

Methods: We retrospectively reviewed lists of all inpatients with neurological immune-related adverse events (irAEs) treated at the neurology departments of three hospitals in January 2017 and December 2019. We also performed a review of the previous case reports with polyradiculoneuropathy induced by ICI therapy.

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Recently published long-term data from randomized controlled trials have provided evidence for the prevention of recurrent embolic stroke of undetermined source by percutaneous closure of the patent foramen ovale. However, most data were obtained from Caucasian populations and evidence on patent foramen ovale closure in Asian-Pacific patients is limited. The relative paucity in clinical data from this population, as well as the fact that Asian-Pacific patients may have higher bleeding risks than Caucasians, complicates clinical decision-making.

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Background: Perioperative cerebral infarction is one of the concerning complications after transcatheter aortic valve implantation in patients with aortic stenosis. Several studies have reported on this complication; however, those included only Caucasians and analyzed a small number of cases. Here, we report on the characteristics and risk factors of symptomatic cerebral infarction after transcatheter aortic valve implantation in a single, high-volume center in Japan.

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Central neurogenic hyperventilation (CNH) is a rare condition, with 37 cases reported in the literature to date. The underlying mechanisms remain unclear. Primary central nervous system lymphoma (PCNSL) is the most common cause of CNH, with 17 cases reported so far.

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We report the case of a 53-year-old-man who developed human T-cell leukemia virus type-1-associated myelopathy (HAM) after ABO-incompatible liver transplantation for alcoholic liver cirrhosis. The living donor was seropositive for human T-cell leukemia virus type-1 (HTLV-1) and the recipient was seronegative for HTLV-1 before transplantation. After transplantation, the recipient developed steroid-resistant acute cellular rejection, which was successfully treated using anti-thymocyte globulin, and he was eventually discharged.

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Previous reports have suggested that direct oral anticoagulants exert a prothrombolytic effect against intracardiac thrombi. We hypothesized that these anticoagulants may also help recanalize occluded intracranial arteries via prothrombolytic effects. In this study, we evaluated the effects of rivaroxaban, a direct oral anticoagulant, on fibrin emboli within the cerebrocortical microvessels in a mouse model of embolic stroke.

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Background: The efficacy and safety of antiplatelet drugs in the treatment of moyamoya disease remain unclear. This study reports results of a nationwide survey conducted in 2016 on the trends of antiplatelet therapy for moyamoya disease in Japan.

Methods: Data were obtained through questionnaires related to treatment policies regarding antiplatelet drugs from each specialized stroke management department of 765 hospitals in Japan.

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Seipinopathy is an autosomal dominant neurodegenerative disease caused by mutations of the Berardinelli-Seip Congenital Lipodystrophy 2 (BSCL2) gene. We report the first Japanese case of seipinopathy with a heterozygous mutation of p.N88S in the BSCL2 gene.

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A hemodynamic mechanism has long been assumed to play an important role in watershed infarction. In recent years, however, clinical evidence has indicated that an embolic mechanism is involved. The mechanism by which emboli are trapped preferentially in watershed areas remains unclear.

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Background: Despite the common practice of surgery and antiplatelet therapy for the prevention of recurrent stroke in patients with moyamoya disease, the benefit of these treatments is controversial. We analyzed the stroke recurrence rate in the Registry Study of Research Committee on Moyamoya Disease in Japan funded by the Health, Labor and Welfare Ministry of Japan.

Methods: An annual follow-up study of the registered cases was continued for 10 years.

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Background: Various sensory impairments have been reported in patients with lateral medullary syndrome, also known as Wallenberg syndrome. The typical sensory impairments experienced by patients with this condition are ipsilateral facial and contralateral trunk and limb thermal hypesthesia and hypoalgesia. Tactile (light touch) sensation is not generally diminished.

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Purpose: Induced pluripotent stem cells (iPSCs) improve behavior and form neurons after implantation into the stroke-injured adult rodent brain. How the aged brain responds to grafted iPSCs is unknown. We determined survival and differentiation of grafted human fibroblast-derived iPSCs and their ability to improve recovery in aged rats after stroke.

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