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Hokkaido University Collection of Scholarly and Academic Papers (135.521 recursos)

HUSCAP (Hokkaido University Collection of Scholarly and Academic Papers) contains peer-reviewed journal articles, proceedings, educational resources and any kind of scholarly works of Hokkaido University.

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Mostrando recursos 1 - 20 de 328

  1. Endoscopic ultrasonography features of gastric mucosal cobblestone-like changes from a proton-pump inhibitor

    Miyamoto, Shuichi; Kudo, Takahiko; Kato, Mototsugu; Matsuda, Kana; Abiko, Satoshi; Tsuda, Momoko; Mizushima, Takeshi; Yamamoto, Keiko; Ono, Shoko; Shimizu, Yuichi; Sakamoto, Naoya
    A 68-year-old man with no symptoms presented to Hokkaido University Hospital for esophagogastroduodenoscopy screening. He had a history of Helicobacter pylori eradication. Initial esophagogastroduodenoscopy showed no gastric cobblestone-like mucosa or gastric cracked mucosa. After 1 year, he received esomeprazole (20 mg) once daily for heartburn at another hospital. Esophagogastroduodenoscopy was performed after 2 years of esomeprazole administration. Endoscopic findings showed that after H. pylori eradication, according to the Kyoto classification, gastric cobblestone-like mucosa presented in the gastric body area. Dilation of the oval crypt opening and intervening part in the gastric cobblestone-like mucosa was detected by endoscopy with narrow band...

  2. Bi-ventricular interplay in patients with systemic sclerosis-associated pulmonary arterial hypertension : Detection by cardiac magnetic resonance

    Noguchi, Atsushi; Kato, Masaru; Kono, Michihito; Ohmura, Kazumasa; Ohira, Hiroshi; Tsujino, Ichizo; Oyama-Manabe, Noriko; Oku, Kenji; Bohgaki, Toshiyuki; Horita, Tetsuya; Yasuda, Shinsuke; Nishimura, Masaharu; Atsumi, Tatsuya
    Objectives: Pulmonary arterial hypertension (PAH) associated with systemic sclerosis (SSc) has a poor prognosis compared to PAH associated with other connective tissue diseases (CTD). The objective of this study was to examine the difference in hemodynamic state between SSc-PAH and other CTD-PAH by performing cardiac magnetic resonance (CMR) imaging.Methods: A single center retrospective analysis was conducted comprising 40 consecutive CTD patients who underwent right heart catheterization and CMR at the same period from January 2010 to October 2015. Results: Thirty-two patients had pre-capillary pulmonary hypertension. Of these, 15 had SSc and 17 had other CTD. CMR measurements, particularly the ratio...

  3. USEFULNESS OF THE CONTINUOUS-WAVE DOPPLER-DERIVED PULMONARY ARTERIAL-RIGHT VENTRICULAR PRESSURE GRADIENT JUST BEFORE ATRIAL CONTRACTION FOR THE ESTIMATION OF PULMONARY ARTERIAL DIASTOLIC AND WEDGE PRESSURES

    Murayama, Michito; Mikami, Taisei; Kaga, Sanae; Okada, Kazunori; Hioka, Takuma; Masauzi, Nobuo; Nakabachi, Masahiro; Nishino, Hisao; Yokoyama, Shinobu; Nishida, Mutsumi; Iwano, Hiroyuki; Sakakibara, Mamoru; Yamada, Satoshi; Tsutsui, Hiroyuki
    In our new echocardiographic method, pulmonary regurgitant velocity immediately before right atrial (RA) contraction is used to estimate pulmonary artery diastolic pressure (PADP) and mean PA wedge pressure (MPAWP). Our aim here was to compare the usefulness of this new method with that of the conventional method, which uses pulmonary regurgitant velocity at end diastole. We studied 55 consecutive patients who underwent echocardiography and right-sided heart catheterization. The pulmonary regurgitant velocities just before RA contraction and at end diastole were measured to obtain echocardiographic estimates of PADP (EPADP(preA) and EPADP(ED), respectively) by adding the pressure gradients to the echocardiographically estimated...

  4. Genetic basis for childhood interstitial lung disease among Japanese infants and children

    Hayasaka, Itaru; Cho, Kazutoshi; Akimoto, Takuma; Ikeda, Masahiko; Uzuki, Yutaka; Yamada, Masafumi; Nakata, Koh; Furuta, Itsuko; Ariga, Tadashi; Minakami, Hisanori
    Background: Genetic variants responsible for childhood interstitial lung disease (chILD) have not been studied extensively in Japanese patients. Methods: The study population consisted of 62 Japanese chILD patients. Twenty-one and four patients had pulmonary hypertension resistant to treatment (PH) and hypothyroidism, respectively. Analyses of genetic variants were performed in all 62 patients for SFTPC and ABCA3, in all 21 PH patients for FOXF1, and in a limited number of patients for NKX2.1. Results: Causative genetic variants for chILD were identified in 11 (18%) patients: SFTPC variants in six, NKX2.1 variants in three, and FOXF1 variants in two patients. No patients...

  5. Residual tumour detection in post-treatment granulation tissue by using advanced diffusion models in head and neck squamous cell carcinoma patients

    Fujima, Noriyuki; Yoshida, Daisuke; Sakashita, Tomohiro; Homma, Akihiro; Kudo, Kohsuke; Shirato, Hiroki
    Purpose: To evaluate the detectability of the residual tumour in post-treatment granulation tissue using parameters obtained with an advanced diffusion model in patients with head and neck squamous cell carcinoma (HNSCC) treated by chemoradiation therapy. Materials and methods: We retrospectively evaluated 23 patients with HNSCC after the full course of chemoradiation therapy. The diffusion-weighted image (DWI) acquisition used single-shot spin-echo echo-planar imaging with 11 b-values (0-1000). We calculated 10 DWI parameters using a mono-exponential model, a bi-exponential model, a stretched exponential model (SEM), a diffusion kurtosis imaging (DKI) model and a statistical diffusion model (SDM) in the region of interest...

  6. Relationships of left ventricular strain and strain rate to wall stress and their afterload dependency

    Murai, Daisuke; Yamada, Satoshi; Hayashi, Taichi; Okada, Kazunori; Nishino, Hisao; Nakabachi, Masahiro; Yokoyama, Shinobu; Abe, Ayumu; Ichikawa, Ayako; Ono, Kota; Kaga, Sanae; Iwano, Hiroyuki; Mikami, Taisei; Tsutsui, Hiroyuki
    Whether and how left ventricular (LV) strain and strain rate correlate with wall stress is not known. Furthermore, it is not determined whether strain or strain rate is less dependent on the afterload. In 41 healthy young adults, LV global peak strain and systolic peak strain rate in the longitudinal direction (LS and LSR, respectively) and circumferential direction (CS and CSR, respectively) were measured layer-specifically using speckle tracking echocardiography (STE) before and during a handgrip exercise. Among all the points before and during the exercise, all the STE parameters significantly correlated linearly with wall stress (LS: r = -0.53, p...

  7. Effects of vestibular rehabilitation combined with transcranial cerebellar direct current stimulation in patients with chronic dizziness : An exploratory study

    Koganemaru, Satoko; Goto, Fumiyuki; Arai, Miki; Toshikuni, Keitaro; Hosoya, Makoto; Wakabayashi, Takeshi; Yamamoto, Nobuko; Minami, Shujiro; Ikeda, Satoshi; Ikoma, Katsunori; Mima, Tatsuya
    Background: Vestibular rehabilitation is useful to alleviate chronic dizziness in patients with vestibular dysfunction. It aims to induce neuronal plasticity in the central nervous system (especially in the cerebellum) to promote vestibular compensation. Transcranial cerebellar direct current stimulation (tcDCS) reportedly enhances cerebellar function. Objective/Hypothesis: We investigated whether vestibular rehabilitation partially combined with tcDCS is superior to the use of rehabilitation alone for the alleviation of dizziness. Methods: Patients with chronic dizziness due to vestibular dysfunction received rehabilitation concurrently with either 20-min tcDCS or sham stimulation for 5 days. Pre- and post-intervention (at 1 month) dizziness handicap inventory (DHI) scores and...

  8. Post-relapse survival in patients with the early and late distant recurrence in estrogen receptor-positive HER2-negative breast cancer

    Ogiya, Akiko; Yamazaki, Kieko; Horii, Rie; Shien, Tadahiko; Horimoto, Yoshiya; Masuda, Norikazu; Inao, Touko; Hosoda, Mitsuchika; Ishida, Naoko; Osako, Tomofumi; Takahashi, Masato; Endo, Yumi; Miyoshi, Yuichiro; Yasojima, Hiroyuki; Tomioka, Nobumoto; Yamashita, Hiroko; Collaborative Study Group of Scientific Research of the Japanese Breast Cancer Society
    Background: Few studies have been performed on post-relapse survival in patients with the early and late distant recurrence in estrogen receptor (ER)-positive, HER2-negative breast cancer. Methods: A total of 205 patients with the early distant recurrence and 134 patients with the late distant recurrence of ER-positive, HER2-negative breast cancer who had undergone breast surgery or neoadjuvant chemotherapy between January 2000 and December 2004 were registered from nine institutions. Prognostic factors for post-relapse survival in patients with the early and late recurrence were analyzed. Results: Post-relapse survival was significantly longer in patients with the late recurrence than in patients with the...

  9. Histological Findings in the Trabecular Meshwork of a Patient with Atopic Glaucoma

    Kase, Satoru; Chin, Shinki; Hamanaka, Teruhiko; Shinmei, Yasuhiro; Ohguchi, Takeshi; Kijima, Riki; Matsuda, Akira; Ishida, Susumu
    Purpose: The aim of this study was to report a case of atopic dermatitis showing elevated intraocular pressure (IOP) beyond the baseline levels followed by a modified 360-degree suture trabeculotomy, and to analyze the histological findings in the trabecular meshwork. Methods: A 40-year-old male suffered from blurred vision in the right eye (OD). He had a medical history of severe atopic dermatitis and intraocular lens implantation OU due to atopic cataract. At the initial presentation, the visual acuity was 0.03, and IOP was 35 mmHg OD. Slit-lamp examination demonstrated corneal epithelial edema OD. Increased IOP was refractory to several topical...

  10. Influence of nitrous oxide on granule cell migration in the dentate gyrus of the neonatal rat

    Saito, Hitoshi; Kato, Rui; Hashimoto, Toshikazu; Uchida, Yosuke; Hase, Tetsutaro; Tsuruga, Kenkichi; Takita, Koichi; Morimoto, Yuji
    For several decades, the neurotoxicities of anesthetics to the developing brain have been reported by many researchers focusing on various phenomena such as apoptosis, neurodegeneration, electrophysiological aberrations, and behavioral abnormalities. According to these reports, signals via N-methyl-D-aspartate receptors (NMDA-r) and/or γ-aminobutyric acid type A receptors (GABA(A)-r) are implicated in the anesthetic neurotoxicity. On the other hand, during brain development, NMDA-r and GABA(A)-r are also recognized to play primary roles in neural cell migration. Therefore, anesthetics exposed in this period may influence the neural cell migration of neonates, and increase the number of hilar ectopic granule cells, which are reported to...

  11. 北海道HIV福祉サービスネットワークの構築

    富田, 健一; 白坂, るみ; 遠藤, 知之; 渡部, 恵子; 武内, 阿味; 坂本, 玲子; センテノ田村, 恵子; 石田, 陽子; 豊嶋, 崇徳
    目的:HIV 陽性者へ困難なく福祉サービス提供を行うため,HIV 陽性者からの利用申し込みを拒否しない福祉サービス事業所が参加するネットワークを構築する。方法:北海道ブロック各拠点病院HIV 担当ソーシャルワーカーにより以下の福祉事業所へネットワークへの参加依頼を行った。(1) 2012 年にはばたき福祉事業団が道内の福祉施設を対象に行った「施設を対象としたエイズ患者/HIV 感染者生活支援実態調査」においてHIV 感染者の受け入れ可能と回答した事業所。(2) HIV 陽性者へのサービス提供の経験がある事業所。(3) 北海道大学病院が行っているHIV 出張研修を受けた事業所。(4) ソーシャルワーカーが職能団体を通じて繋がりのある事業所。さらに,北海道保健福祉部から北海道内の社会福祉法人に対して,ネットワーク参加依頼の文書が配布された。結果:ネットワークへの参加を働きかけたところ,51 件の法人本部,福祉事業所代表の登録が得られ,グループ内の407 件の福祉事業所に利用申し込みをすることが可能となった。一方でネットワークへの参加を断った福祉事業所もあった。考察:行政からの依頼で多くの社会福祉法人のネットワーク登録があったことから,ネットワーク構築には行政との連携が有効であると考えられた。現在,ネットワークに参加している事業所は札幌圏に集中している。また,訪問看護サービスが多く参加している一方で入所サービスの参加が少ないという偏りもある。HIV 陽性者のニーズに応じた福祉サービスを提供するためには,ネットワークのさらなる拡大が必要である。

  12. Induction of anti-VEGF therapy resistance by upregulated expression of microseminoprotein (MSMP)

    Mitamura, T; Pradeep, S; McGuire, M; Wu, S Y; Ma, S; Hatakeyama, H; Lyons, Y A; Hisamatsu, T; Noh, K; Villar-Prados, A; Chen, X; Ivan, C; Rodriguez-Aguayo, C; Hu, W; Lopez-Berestein, G; Coleman, R L; Sood, A K
    Anti-vascular endothelial growth factor (VEGF) therapy has demonstrated efficacy in treating human metastatic cancers, but therapeutic resistance is a practical limitation and most tumors eventually become unresponsive. To identify microenvironmental factors underlying the resistance of cancer to antiangiogenesis therapy, we conducted genomic analyses of intraperitoneal ovarian tumors in which adaptive resistance to anti-VEGF therapy (B20 antibody) developed. We found that expression of the microseminoprotein, prostate-associated (MSMP) gene was substantially upregulated in resistant compared with control tumors. MSMP secretion from cancer cells was induced by hypoxia, triggering MAPK signaling in endothelial cells to promote tube formation in vitro. Recruitment of the...

  13. Radical prostatectomy restores detrusor contraction pattern according to pressure flow parameters

    Kitta, Takeya; Kanno, Yukiko; Chiba, Hiroki; Moriya, Kimihiko; Maruyama, Satoru; Abe, Takashige; Shinohara, Nobuo
    Objectives: Pressure flow studies are regarded as the gold standard for evaluating both bladder outlet obstruction and detrusor contractility, but none of the current methods for evaluating bladder contraction patterns are well validated. Impaired bladder contraction results in a lower peak Watts factor and poorly sustained detrusor contractions. From this viewpoint, the maximum Watts factor and its pattern should be considered separately. To examine detrusor contraction pattern in patients after radical prostatectomy by using multiple parameters. Methods: A total of 37 patients with clinically localized prostate cancer underwent both pre- and post-radical prostatectomy urodynamic evaluations. The examined urodynamic parameters included...

  14. Automatic Estimation of Volumetric Breast Density Using Artificial Neural Network-Based Calibration of Full-Field Digital Mammography : Feasibility on Japanese Women With and Without Breast Cancer

    Wang, Jeff; Kato, Fumi; Yamashita, Hiroko; Baba, Motoi; Cui, Yi; Li, Ruijiang; Oyama-Manabe, Noriko; Shirato, Hiroki
    Background: Breast cancer is the most common invasive cancer among women and its incidence is increasing. Risk assessment is valuable and recent methods are incorporating novel biomarkers such as mammographic density. Artificial neural networks (ANN) are adaptive algorithms capable of performing pattern-to-pattern learning and are well suited for medical applications. They are potentially useful for calibrating Full-Field Digital Mammography (FFDM) for quantitative analysis. This study uses ANN modeling to estimate volumetric breast density (VBD) from FFDM on Japanese women with and without breast cancer. Methods: ANN calibration of VBD was performed using phantom data for one FFDM system. Mammograms of...

  15. Identification of novel serum autoantibodies against EID3 in non-functional pancreatic neuroendocrine tumors

    Hontani, Koji; Tsuchikawa, Takahiro; Hiwasa, Takaki; Nakamura, Toru; Ueno, Takashi; Kushibiki, Toshihiro; Takahashi, Mizuna; Inoko, Kazuho; Takano, Hironobu; Takeuchi, Satoshi; Dosaka-Akita, Hirotoshi; Kuwatani, Masaki; Sakamoto, Naoya; Hatanaka, Yutaka; Mitsuhashi, Tomoko; Shimada, Hideaki; Shichinohe, Toshiaki; Hirano, Satoshi
    Pancreatic neuroendocrine tumors (pNETs) are relatively rare heterogenous tumors, comprising only 1-2% of all pancreatic neoplasms. The majority of pNETs are non-functional tumors (NF-pNETs) that do not produce hormones, and as such, do not cause any hormone-related symptoms. As a result, these tumors are often diagnosed at an advanced stage because patients do not present with specific symptoms. Although tumor markers are used to help diagnosis and predict some types of cancers, chromogranin A, a widely used tumor marker of pNETs, has significant limitations. To identify novel NF-pNET-associated antigens, we performed serological identification of antigens by recombinant cDNA expression cloning...

  16. Direct Immunofluorescence Using Non-Lesional Buccal Mucosa in Mucous Membrane Pemphigoid

    Kamaguchi, Mayumi; Iwata, Hiroaki; Ujiie, Inkin; Ujiie, Hideyuki; Sato, Jun; Kitagawa, Yoshimasa; Shimizu, Hiroshi
    Mucous membrane pemphigoid (MMP) is a rare organ-specific autoimmune subepithelial blistering disease with predominantly mucosal erosions, most frequently affecting the gingiva. Erosions in the oral cavity usually result in markedly decreased quality of life. The major autoantigens are BP180 and laminin332, which are components of basement membrane proteins in the skin and mucosa. Diagnosis is usually difficult due to histological destruction of the tissue and low autoantibody titers. In this study, we evaluated the diagnostic value of direct immunofluorescence (DIF) using non-lesional buccal mucosa in seven cases of MMP. In all seven patients, gingival lesions were clinically observed, and in...

  17. One-Stage Laparoscopic Surgery for Pulmonary Sequestration and Hiatal Hernia in a 2-Year-Old Girl

    Miyagi, Hisayuki; Honda, Shohei; Hamada, Hiromi; Minato, Masashi; Ara, Momoko W.; Taketomi, Akinobu
    We herein report a case of one-stage laparoscopic surgery for extralobar pulmonary sequestration (EPS) and hiatal hernia. Our patient was a 2-year-old girl who was diagnosed as a mediastinal mass lesion. Postnatal computed tomography revealed that the mediastinal mass was an EPS. Two weeks after birth, the patient developed gastroesophageal reflux (GER), and esophagography showed a hiatal hernia. At 2 years of age, she underwent one-stage laparoscopic Nissen's fundoplication for GER with resection of the EPS in the posterior mediastinum. The sequestrated lung was grasped via the esophageal hiatus; three aberrant blood vessels were dissected to allow removal of the...

  18. Prediction of the treatment outcome using intravoxel incoherent motion and diffusional kurtosis imaging in nasal or sinonasal squamous cell carcinoma patients

    Fujima, Noriyuki; Yoshida, Daisuke; Sakashita, Tomohiro; Homma, Akihiro; Tsukahara, Akiko; Shimizu, Yukie; Tha, Khin Khin; Kudo, Kohsuke; Shirato, Hiroki
    Objectives: To evaluate the diagnostic value of intravoxel incoherent motion (IVIM) and diffusional kurtosis imaging (DKI) parameters in nasal or sinonasal squamous cell carcinoma (SCC) patients to determine local control/failure. Methods: Twenty-eight patients were evaluated. MR acquisition used single-shot spin-echo EPI with 12 b-values. Quantitative parameters (mean value, 25th, 50th and 75th percentiles) of IVIM (perfusion fraction f, pseudo-diffusion coefficient D*, and true-diffusion coefficient D), DKI (kurtosis value K, kurtosis corrected diffusion coefficient Dk) and apparent diffusion coefficient (ADC) were calculated. Parameter values at both the pretreatment and early-treatment period, and the percentage change between these two periods were obtained....

  19. R-Spondin1 expands Paneth cells and prevents dysbiosis induced by graft-versus-host disease

    Hayase, Eiko; Hashimoto, Daigo; Nakamura, Kiminori; Noizat, Clara; Ogasawara, Reiki; Takahashi, Shuichiro; Ohigashi, Hiroyuki; Yokoi, Yuki; Sugimoto, Rina; Matsuoka, Satomi; Ara, Takahide; Yokoyama, Emi; Yamakawa, Tomohiro; Ebata, Ko; Kondo, Takeshi; Hiramine, Rina; Aizawa, Tomoyasu; Ogura, Yoshitoshi; Hayashi, Tetsuya; Mori, Hiroshi; Kurokawa, Ken; Tomizuka, Kazuma; Ayabe, Tokiyoshi; Teshima, Takanori
    The intestinal microbial ecosystem is actively regulated by Paneth cell-derived antimicrobial peptides such as α-defensins. Various disorders, including graft-versus-host disease (GVHD), disrupt Paneth cell functions, resulting in unfavorably altered intestinal microbiota (dysbiosis), which further accelerates the underlying diseases. Current strategies to restore the gut ecosystem are bacteriotherapy such as fecal microbiota transplantation and probiotics, and no physiological approach has been developed so far. In this study, we demonstrate a novel approach to restore gut microbial ecology by Wnt agonist R-Spondin1 (R-Spo1) or recombinant α-defensin in mice. R-Spo1 stimulates intestinal stem cells to differentiate to Paneth cells and enhances luminal secretion...

  20. Primary malignant melanoma of the esophagus treated with subtotal esophagectomy : a case report

    Kuwabara, Shota; Ebihara, Yuma; Nakanishi, Yoshitsugu; Asano, Toshimichi; Noji, Takehiro; Kurashima, Yo; Murakami, Soichi; Nakamura, Toru; Tsuchikawa, Takahiro; Okamura, Keisuke; Shichinohe, Toshiaki; Hirano, Satoshi
    Background: Primary malignant melanoma of the esophagus (PMME) is a rare disease with a poor prognosis. There are few reports of early-stage cases in which tumor invasion reached the lamina propria or muscularis mucosae, as in the present case. A standard treatment for early-stage PMME has not yet been established. The present study aimed to summarize previous reports and to discuss the indications for surgical treatment of early-stage primary malignant melanoma of the esophagus. Case presentation: A 70-year-old woman with PMME was referred to our hospital. She underwent thoracoscopic and laparoscopic subtotal esophagectomy with lymphadenectomy. The resected specimen showed melanocytosis...

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