Koichi Arimura

ORCID: 0000-0003-2455-9506
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About
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Research Areas
  • Intracranial Aneurysms: Treatment and Complications
  • Cerebrovascular and Carotid Artery Diseases
  • Acute Ischemic Stroke Management
  • Moyamoya disease diagnosis and treatment
  • Vascular Malformations Diagnosis and Treatment
  • Traumatic Brain Injury and Neurovascular Disturbances
  • Stroke Rehabilitation and Recovery
  • Intracerebral and Subarachnoid Hemorrhage Research
  • Neurosurgical Procedures and Complications
  • Neurological Disease Mechanisms and Treatments
  • Barrier Structure and Function Studies
  • Neurological Complications and Syndromes
  • Cerebrospinal fluid and hydrocephalus
  • Meningioma and schwannoma management
  • Neuroinflammation and Neurodegeneration Mechanisms
  • Neurological Disorders and Treatments
  • Face and Expression Recognition
  • Venous Thromboembolism Diagnosis and Management
  • Image Processing Techniques and Applications
  • Spinal Hematomas and Complications
  • Image Retrieval and Classification Techniques
  • Medical Imaging and Analysis
  • Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Renal and Vascular Pathologies
  • Atrial Fibrillation Management and Outcomes

Kyushu University
2016-2025

Koga Hospital
2007-2025

Kyushu University Hospital
2021

Kobe City Medical Center General Hospital
2015-2019

Clinical Research Institute
2018

Nara Medical University
2018

Kyorin University
2018

Showa University Hospital
2018

Iwate Medical University
2018

National Cerebral and Cardiovascular Center
2018

Platelet derived growth factor (PDGF)-B plays a neuroprotective role in brain damages, including ischemic stroke. It has been suggested recently that PDGF receptor β (PDGFRβ) expressed pericytes as well neurons and astrocytes may mediate the of PDGF-B. The aims this study were to elucidate roles PDGFRβ signaling after In rat middle cerebral artery occlusion (MCAO) model, expression was induced specifically peri-infarct areas its level gradually increased. PDGF-B marked phosphorylation Akt...

10.2174/156720212799297100 article EN Current Neurovascular Research 2012-02-01
Ryota Kurogi Kunihiro Nishimura Michikazu Nakai Akiko Kada Satoru Kamitani and 95 more Jyoji Nakagawara Ḱazunori Toyoda Kuniaki Ogasawara Junichi Ono Yoshiaki Shiokawa Toru Aruga Shigeru Miyachi Izumi Nagata Shinya Matsuda Shinichi Yoshimura Kazuo Okuchi Akifumi Suzuki Fumiaki Nakamura Daisuke Onozuka Keisuke Ido Ai Kurogi Nobutaka Mukae Ataru Nishimura Koichi Arimura Takanari Kitazono Akihito Hagihara Koji Iihara Masayoshi Takigami Kenji Kamiyama Kiyohiro Houkin Shougo Nishi Tetsuyuki Yoshimoto Sadao Kaneko Koji Oka Yusuke Nakagaki Hiroshi Ooyama Kyousuke Kamada Kenichi Makino Naoki Tokumitsu Kazuhiro Sako Naoki Tokumitsu Susumu Suzuki Nozomi Suzuki Teruo Kimura Naoto Izumi K. Nitta Masahumi Ootaki Masanori Isobe Mikio NISHIYA Takaaki Yamazaki Syouji Mabuchi Kuniaki Ogasawara Naohiko Kubo Yukihiko Shimizu Keiichi Saito Tatumi Yamanome Akinori Yabuta Akira Suzuki Atsuo Yoshino Junichi Harashina Mitsuyuki Fujitsuka Hiroyuki Masaoka Masaaki Takami Hirotoshi Ohtaka Teruyuki Hirano Y Shiokawa Takaharu Okada Ichirô Suzuki Michihiro Kohno Jou Haraoka Yoshinori Arai Noriyoshi Kawamura Akira Isoshima Masaharu Yasue Mitsuhiko Hokari Takayoshi Kobayashi Kensuke Kawai Taketoshi Maehara Hajime Arai Takakazu Kawamata Yoshikazu Okada Makoto Noguchi Haruhiko Hoshino Hirofumi Hiyama Kensaku Yoshida Mitsuyuki Fujitsuka Osamu Utsugi Yasuaki Takeda Kouichi Tamaki Hirohide Karasudani Takao Urabe Shiro Kobayashi Michio Nakamura Yorio Koguchi Junichi Ono Sumio Suda Hiromu Hadeishi Toshio Fukutake Kenji Wakui Hirokazu Tanno

<h3>Objectives</h3> This cross-sectional survey explored the characteristics and outcomes of direct oral anticoagulant (DOAC)–associated nontraumatic intracerebral hemorrhages (ICHs) by analyzing a large nationwide Japanese discharge database. <h3>Methods</h3> We analyzed data from 2,245 patients who experienced ICHs while taking anticoagulants (DOAC: 227; warfarin: 2,018) were urgently hospitalized at 621 institutions in Japan between April 2010 March 2015. compared DOAC- warfarin-treated...

10.1212/wnl.0000000000005207 article EN cc-by-nc-nd Neurology 2018-03-01

Pericytes are mural cells abundantly present in cerebral microvessels and play important roles, including the formation maintenance of blood-brain barrier. Nox4 is a major source reactive oxygen species cardiovascular modulate cellular functions, particularly under pathological conditions. In study, we found that expression was markedly induced microvascular cells, pericytes, peri-infarct areas after middle artery occlusion stroke models mice. The upregulation greater permanent model...

10.1177/0271678x15606456 article EN Journal of Cerebral Blood Flow & Metabolism 2015-10-13

Purpose To evaluate and compare the performance of acceleration-selective arterial spin labeling (AccASL) magnetic resonance (MR) angiography in visualization cerebral arteries collateral vessels patients with Moyamoya disease that time-of-flight (TOF) MR angiography, digital subtraction (DSA) as reference standard. Materials Methods Thirty-six hemispheres from 22 underwent TOF AccASL DSA. Qualitative evaluations included imaging terminal internal carotid artery (ICA), distal middle (MCAs),...

10.1148/radiol.2017162279 article EN Radiology 2017-09-15

Objective We sought to examine whether the effect of treatment modality and drugs for cerebral vasospasm on clinical outcomes differs between elderly non-elderly subarachnoid hemorrhage (SAH) patients in Japan. Methods analyzed J-ASPECT Study Diagnosis Procedure Combination database (n = 17,343) that underwent clipping or coiling 2010 2014 579 hospitals. stratified into two groups according their age (elderly [≥75 years old], n 3,885; non-elderly, 13,458). anti-vasospasm agents (fasudil...

10.1371/journal.pone.0230953 article EN cc-by PLoS ONE 2020-04-09

We have previously shown that Na(+)/H(+) exchanger isoform 1 (NHE1) plays an important role in Ca(2+) signaling and cell proliferation human central nervous system (CNS) pericytes. The aims of the present study were to elucidate how NHE1-induced during acidosis is transformed into cellular responses CNS pericytes.Human pericytes cultured, activation cAMP responsive element-binding protein (CREB) was evaluated by Western blotting analysis, immunofluorescence, luciferase assays. In pericytes,...

10.1161/atvbaha.112.254946 article EN Arteriosclerosis Thrombosis and Vascular Biology 2012-08-25
Keitaro Yamagami Ryota Kurogi Ai Kurogi Kunihiro Nishimura Daisuke Onozuka and 95 more Nice Ren Akiko Kada Ataru Nishimura Koichi Arimura Keisuke Ido Masahiro Mizoguchi Tetsuya Sakamoto Takamasa Kayama Michiyasu Suzuki Hajime Arai Akihito Hagihara Koji Iihara Masayoshi Takigami Kenji Kamiyama Kiyohiro Houkin Shougo Nishi Tetsuyuki Yoshimoto Sadao Kaneko Koji Oka Hiroshi Ooyama Kyousuke Kamada Kenichi Makino Naoki Tokumitsu Kazuhiro Sako Naoki Tokumitsu Susumu Suzuki Nozomi Suzuki Naoto Izumi K. Nitta Masahumi Ootaki Masanori Isobe Mikio NISHIYA Takaaki Yamazaki Syouji Mabuchi Kuniaki Ogasawara Naohiko Kubo Yukihiko Shimizu Keiichi Saito Tatumi Yamanome Atsuo Yoshino Mitsuyuki Fujitsuka Masaaki Takami Hirotoshi Ohtaka Teruyuki Hirano Y Shiokawa Takaharu Okada Ichirō Suzuki Michihiro Kohno Jou Haraoka Yoshinori Arai Noriyoshi Kawamura Akira Isoshima Masaharu Yasue Mitsuhiko Hokari Takayoshi Kobayashi Kensuke Kawai Taketoshi Maehara Hajime Arai Makoto Noguchi Haruhiko Hoshino Hirofumi Hiyama Kensaku Yoshida Osamu Utsugi Yasuaki Takeda Kouichi Tamaki Hirohide Karasudani Takao Urabe Shiro Kobayashi Michio Nakamura Yorio Koguchi Junichi Ono Sumio Suda Hiromu Hadeishi Toshio Fukutake Kenji Wakui Hirokazu Tanno Naoki Ishige Takashi Ohasi Hideki Sakai Yasuaki Nishimura Takayuki Watanabe Takashi Matsumoto Naoki Koketsu Yuichi Hirose Manabu Doyu Toshinori Hasegawa Naoto Kuwayama Shin-ichi Terao Nobuhiko Mizutani Noriyuki Suzaki Satoshi Okuda Keizo Yasui Yukio Seki Yasuhiro Hasegawa Akira Ikeda Youtarou Takeuchi

10.1016/j.wneu.2019.05.140 article EN World Neurosurgery 2019-05-24

Background The efficacy of combined stent retriever (SR) and aspiration catheter (AC; technique: CBT) use for acute ischemic stroke (AIS) is unclear. We investigated the safety single-unit CBT (SCBT)—retrieving thrombus as a single unit with SR AC into guide catheter—compared either or contact (CA). Methods analysed 763 consecutive patients who underwent mechanical thrombectomy AIS between January 2013 2020, at six comprehensive centers. Patients were divided SCBT device (SR/CA) groups....

10.1136/neurintsurg-2021-017837 article EN Journal of NeuroInterventional Surgery 2021-09-20

<h3>BACKGROUND AND PURPOSE:</h3> An accurate assessment of the hemodynamics an intracranial dural AVF is necessary for treatment planning. We aimed to investigate utility 4D-MRA based on superselective pseudocontinuous arterial spin-labeling with CENTRA-keyhole and view-sharing (4D-S-PACK) vessel-selective visualization AVFs. <h3>MATERIALS METHODS:</h3> retrospectively analyzed images 21 patients (12 men 9 women; mean age, 62.2 [SD,19.2] years) AVFs, each whom was imaged DSA, 4D-S-PACK,...

10.3174/ajnr.a7426 article EN cc-by American Journal of Neuroradiology 2022-03-01

Abstract Objective We evaluated the effect of CHA 2 DS ‐VASc score and prior use oral anticoagulants (OACs) on endovascular treatment (EVT) in patients with acute ischemic stroke atrial fibrillation (AF). Methods Patients AF who received EVT 353 centers Japan (2018–2020) were included. The outcomes symptomatic intracerebral hemorrhage (sICH), in‐hospital mortality, functional independence, successful complete reperfusion. effects score, its components, OACs assessed via a multiple logistic...

10.1002/acn3.52217 article EN cc-by Annals of Clinical and Translational Neurology 2024-10-09

Improved outcomes in patients with subarachnoid hemorrhage (SAH) treated at high-volume centers have been reported. The authors sought to examine whether hospital case volume and comprehensive stroke center (CSC) capabilities affect clipping or coiling for SAH.

10.3171/2019.12.jns192584 article EN Journal of neurosurgery 2020-03-21
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