Faculty Profiles - OTSUKA Fumio

Papers - OTSUKA Fumio

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Prevalence of Inducible Macrolide, Lincosamide, and Streptogramin B (inducible MLSB) Resistance in Clindamycin-Susceptible Staphylococcus aureus at Okayama University Hospital. Reviewed

Lutfun Nahar, Hideharu Hagiya, Takahiro Nada, Koji Iio, Kazuyoshi Gotoh, Osamu Matsushita, Fumio Otsuka

Acta Medica Okayama 77 ( 1 ) 1 - 9 2023.2

Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

Inducible resistance to the macrolide, lincosamide, and streptogramin B (iMLSB) antibiotic family is a latent mechanism for antimicrobial resistance in Staphylococcus aureus. We here investigated the frequency and genotypic profiles of iMLSB resistance in clindamycin (CLDM)-susceptible S. aureus isolated in Okayama University Hospital from June 2020 to June 2021. We phenotypically screened the iMLSB resistance via D-zone test and performed PCR testing for the erythromycin ribosomal methylase (erm) genes: ermA and ermC. Among 432 CLDM-susceptible S. aureus isolates, 138 (31.9%) exhibited an iMLSB-resistance phenotype, with methicillinresistant S. aureus isolates (MRSA; 61 isolates: 58.6%) exhibiting higher positivity than methicillin-sensitive S. aureus isolates (MSSA; 77 isolates: 23.5%) (p<0.001). Male patients had a higher frequency of iMLSB resistance than females (OR [95%CI]: 1.8 [1.2-2.8]; p=0.007). Genotypically, ermA predominated in both MSSA (70.1%) and MRSA (86.9%) compared to ermC (14.3% in MSSA and 11.5% in MRSA). A single strain of MRSA possessed both ermA and ermC, while 12 (15.6%) MSSA isolates were negative for both ermA and ermC, suggesting the presence of other genetic mechanisms. Collectively, these results show that approximately 33% of CLDM-susceptible S. aureus isolates at our university hospital exhibited iMLSB resistance, predominantly caused by ermA in both MSSA and MRSA.

DOI： 10.18926/AMO/64355

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不明熱の原因となるカンピロバクター菌血症の臨床的特徴に関する多施設後方研究

大塚勇輝, 萩谷英大, 高橋美砂, 福島伸乃介, 前田瑠璃, 砂田匠彦, 山田晴士, 岸田雅之, 藤田浩二, 大塚文男

日本病院総合診療医学会雑誌 19 ( 臨増1 ) 214 - 214 2023.2

COVID-19罹患後症状と血清亜鉛濃度の関連

松田祐依, 徳増一樹, 大塚勇輝, 砂田匠彦, 本多寛之, 櫻田泰江, 中野靖浩, 長谷川徹, 萩谷英大, 小比賀美香子, 植田圭吾, 片岡仁美, 大塚文男

日本病院総合診療医学会雑誌 19 ( 臨増1 ) 168 - 168 2023.2

COVID-19罹患後にME/CFSに移行する症例の臨床的特徴血清ferritinと内分泌系に注目した検討

山本幸近, 大塚勇輝, 徳増一樹, 萩谷英大, 砂田匠彦, 本多寛之, 中野靖浩, 櫻田泰江, 松田祐依, 長谷川徹, 長谷川功, 小比賀美香子, 植田圭吾, 片岡仁美, 大塚文男

日本病院総合診療医学会雑誌 19 ( 臨増1 ) 173 - 173 2023.2

大腿骨頸部骨折を契機に発見されたビタミンD欠乏の1例

高瀬了輔, 本多寛之, 中野靖浩, 山本紘一郎, 大國皓平, 越智可奈子, 長谷川功, 三好智子, 花山宜久, 小川弘子, 森泰宏, 大塚文男

日本病院総合診療医学会雑誌 19 ( 臨増1 ) 223 - 223 2023.2

Trends in Long COVID Symptoms in Japanese Teenage Patients. Reviewed International journal

Yasue Sakurada, Yuki Otsuka, Kazuki Tokumasu, Naruhiko Sunada, Hiroyuki Honda, Yasuhiro Nakano, Yui Matsuda, Toru Hasegawa, Kanako Ochi, Hideharu Hagiya, Keigo Ueda, Hitomi Kataoka, Fumio Otsuka

Medicina (Kaunas, Lithuania) 59 ( 2 ) 2023.1

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

Background: Since the start of the global pandemic of coronavirus disease 2019 (COVID-19), not only adults but also many children have suffered from it. However, the clinical characteristics of long COVID in children remain unclear. Methods: In this retrospective observational study conducted in a single facility, we reviewed the medical records of all long COVID patients who visited Okayama University Hospital from February 2021 to October 2022, and we compared the clinical characteristics of long COVID in teenagers (11 to 18 years of age) with those in adults. Results: Data for 452 long COVID patients including 54 teenagers (11.9%) were analyzed. Fatigue was the most frequent symptom in teenagers (55.6% of the patients) and also in adults. On the other hand, the percentage of teenagers who complained of headache, which was the second most frequent complaint, was significantly higher than the percentage of adults (35.2% vs. 21.9%, p < 0.05). A comparison of the frequencies of symptoms depending on the viral variant showed that fatigue and headache were predominant symptoms in the Omicron variant phase. Of the 50 teenagers who were enrolled in schools, 28 (56.0%) could not attend school due to long COVID symptoms. The most common symptoms as reasons for absence from school were fatigue (85.7% of the patients), headache (42.9%), and insomnia (32.1%). Conclusions: Attention should be paid to the symptoms of fatigue and headache in teenagers with long COVID.

DOI： 10.3390/medicina59020261

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Tuberculous meningitis Reviewed

Shinnosuke Fukushima, Kazuki Ocho, Koji Fujita, Hideharu Hagiya, Fumio Otsuka

Clinical Case Reports 11 ( 1 ) 2023.1

Differences in Stress Perception of Medical Students Depending on In-Person Communication and Online Communication during the COVID-19 Pandemic: A Japanese Cross-Sectional Survey. Reviewed International journal

Kazuki Tokumasu, Yoshito Nishimura, Yoko Sakamoto, Mikako Obika, Hitomi Kataoka, Fumio Otsuka

International journal of environmental research and public health 20 ( 2 ) 2023.1

Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: Excessive psychological stress in medical students affects their mental health and causes problems such as burnout and depression. Furthermore, changes in the learning environment to online learning due to the COVID-19 pandemic have had a psychological effect on medical students. However, the relationships between medical students' perceived stress and different methods of communication, including in-person and online communication, remain unclear. The purpose of this study was to investigate the differences in stress perception of medical students depending on in-person communication and online communication during the COVID-19 pandemic. METHODS: This study was a cross-sectional study conducted from September to October in 2020. All of the students of Okayama University School of Medicine were asked to participate in a questionnaire survey. The explanatory variables were the frequency and length of communications with others (by in-person or online communication), empathy, and lifestyle. The main outcome measure was perceived stress. Subgroup analysis was conducted for students who preferred to be by themselves and students who preferred to study together and interact with other people. Univariate analysis and multivariate multiple regression analysis were conducted. Gender and grade, which have been shown to be associated with stress in previous studies, were used as covariates for multiple regression analysis. RESULTS: Valid responses to the questionnaire survey were received from 211 (29.4%) of the 717 students. There was no significant association between perceived stress and online communication, but the number of people with which students had in-person communication (1-2 people compared to 0 as a control, regression coefficient [B] = -4.4, 95% confidence interval [CI]; -7.8, -1.1, more than 10 people, B = -12, 95% CI: -18, -5.8) and the length of communication (more than 120 min, B = -4.5, 95% CI: -8.1, -0.92) were associated with a reduction in perceived stress. In subgroup analysis, the number of people with in-person communication and the length of communication had significant associations with stress reduction even in the group of students who had a preference for being by themselves. CONCLUSION: In-person communications rather than online communications were associated with a lower level of perceived stress. In subgroup analysis, this trend was statistically significant in the group of students who had a preference for being by themselves.

DOI： 10.3390/ijerph20021579

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Clinical characteristics of Campylobacter bacteremia: a multicenter retrospective study. Reviewed International journal

Yuki Otsuka, Hideharu Hagiya, Misa Takahashi, Shinnosuke Fukushima, Ruri Maeda, Naruhiko Sunada, Haruto Yamada, Masayuki Kishida, Koji Fujita, Fumio Otsuka

Scientific reports 13 ( 1 ) 647 - 647 2023.1

Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

Campylobacter species are the pathogens of the intestinal tract, which infrequently cause bacteremia. To reveal the clinical characteristics of Campylobacter bacteremia, we performed a retrospective, multicenter study. Patients diagnosed with Campylobacter bacteremia in three general hospitals in western Japan between 2011 and 2021 were included in the study. Clinical, microbiological, and prognostic data of the patients were obtained from medical records. We stratified the cases into the gastroenteritis (GE) and fever predominant (FP) types by focusing on the presence of gastrointestinal symptoms. Thirty-nine patients (24 men and 15 women) were included, with a median age of 57 years and bimodal distribution between those in their 20 s and the elderly. The proportion of GE and FP types were 21 (53.8%) and 18 (46.2%), respectively. Comparing these two groups, there was no significant difference in patient backgrounds in terms of sex, age, and underlying diseases. Campylobacter jejuni was exclusively identified in the GE type (19 cases, 90.5%), although other species such as Campylobacter fetus and Campylobacter coli were isolated in the FP type as well. Patients with the FP type underwent intravenous antibiotic therapy more frequently (47.6% vs. 88.9%), and their treatment (median: 5 days vs. 13 days) and hospitalization (median: 7 days vs. 21 days) periods were significantly longer. None of the patients died during the hospitalization. In summary, we found that nearly half of the patients with Campylobacter bacteremia presented with fever as a predominant manifestation without gastroenteritis symptoms.

DOI： 10.1038/s41598-022-27330-4

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Takayasu Arteritis Mimicking Phlegmon Reviewed

Yuki Taira, Yasuhiro Nakano, Yoshihisa Hanayama, Fumio Otsuka

Internal Medicine 62 ( 1 ) 149 - 149 2023.1

Oxytocin enhances progesterone production with upregulation of BMP-15 activity by granulosa cells Reviewed

Koichiro Yamamoto, Yasuhiro Nakano, Nahoko Iwata, Yoshiaki Soejima, Atsuhito Suyama, Toru Hasegawa, Fumio Otsuka

Biochemical and Biophysical Research Communications 646 103 - 109 2023.1

Late-Onset Neutropenia With Clozapine Associated With Lithium Carbonate–Related Hyperthyroidism Reviewed

Yuto Yamada, Masaki Fujiwara, Shuhei Tsujino, Satoru Edahiro, Shinji Sakamoto, Koichiro Yamamoto, Fumio Otsuka, Norihito Yamada, Manabu Takaki

Journal of Clinical Psychopharmacology 43 ( 1 ) 76 - 77 2023.1

Examining the association between vaccine reactogenicity and antibody titer dynamics after the third dose of BNT162b2 vaccine using a mixed-effects model Reviewed

Naomi Matsumoto, Hideharu Hagiya, Masanori Nakayama, Masanori Furukawa, Toshiharu Mitsuhashi, Soshi Takao, Fumio Otsuka, Takashi Yorifuji

Journal of Infection and Chemotherapy 29 ( 1 ) 39 - 42 2023.1

Antimicrobials in the Hospital are Unevenly Discontinued on Weekdays Reviewed

Hideharu Hagiya, Mika Uno, Tsukasa Higashionna, Hiroyuki Honda, Fumio Otsuka

Internal Medicine 2023

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Internal Medicine

Objective Amid the global spread of antimicrobial resistance, antimicrobial stewardship should be further promoted in the clinical setting. Our previous study suggested an intra-week disproportion of discontinuation of broad-spectrum antibiotics. We therefore explored the generalization of this prescription trend by investigating the use of all intravenous antibiotics. Methods A retrospective, observational study. Patients Between January 1, 2018, and December 31, 2020, we collected data on the initiation and discontinuation of intravenous antimicrobials on each day of the week and on days after holidays at Okayama University Hospital, Japan. We compared the monthly antimicrobial prescription initiation and discontinuation using the Kruskal-Wallis test and Mann-Whitney U-test with Bonferroni correction as a post-hoc procedure. Results Data from 15,293 hospitalized cases were analyzed. The initiation of antimicrobials differed slightly among days of the week, although this trend was clinically insignificant. Compared with the initiations, antimicrobial discontinuations were disproportionately biased among the weekdays, tending to occur on Mondays (p <0.001) about twice as often as on other days. Similarly, antimicrobials were unevenly discontinued on the day after holidays compared to other days (p <0.001), with an approximately 2-fold difference. The use of antimicrobials in the hospital was thus unequally terminated on weekdays. Conclusion To further promote antimicrobial stewardship, clinicians should be aware of the influence of behavioral, environmental, and social factors on antimicrobial prescription, which is seemingly beyond medical indications.

DOI： 10.2169/internalmedicine.0707-22

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Biofilm-associated candidal thrombophlebitis Reviewed

Shinnosuke Fukushima, Koichiro Yamamoto, Yasuhiro Nakano, Hideharu Hagiya, Fumio Otsuka

IDCases 31 e01733 - e01733 2023

Contributions of Japanese Hospitalists During the COVID-19 Pandemic and the Need for Infectious Disease Crisis Management Education for Hospitalists: An Online Cross-Sectional Study. Reviewed International journal

Masaki Tago, Risa Hirata, Naoko E Katsuki, Yuki Otsuka, Taro Shimizu, Yosuke Sasaki, Kiyoshi Shikino, Takashi Watari, Hiromizu Takahashi, Kazunobu Une, Toshio Naito, Fumio Otsuka, Rachel Thompson, Susumu Tazuma

Risk management and healthcare policy 16 1645 - 1651 2023

Language：English Publishing type：Research paper (scientific journal)

INTRODUCTION: Hospitalists in Japan have been at the forefront of the COVID-19 pandemic. However, contributions of Japanese hospitalists during the COVID-19 pandemic and hospitalists' awareness of crisis management education remain unclear. MATERIAL AND METHODS: We conducted a questionnaire survey to investigate the role of Japanese hospitalists during the COVID-19 pandemic. The questionnaire was conducted using email and Google Forms targeting the chairpersons of facilities certified by the Japanese Society of Hospital General Medicine (JSHGM). Members of the academic committee of the JSHGM and several hospitals conducted a narrative review and determined the questions for the survey in a discussion. RESULTS: We conducted descriptive statistics based on the responses of 97 hospitals that agreed to participate in this survey. In total, 91.8% of general medicine departments in the included hospitals were involved in the medical care of COVID-19 patients. Furthermore, in 73.2% of hospitals, hospitalists were involved in infection control for COVID-19 inside or outside the hospital. Our survey revealed that Japanese hospitalists were responsible for COVID-19 treatment in over 60% of hospitals and contributed to hospital management, infection control, and vaccination. In total, 79.4% of hospitals answered that "training of personnel who can provide practical care for emerging infectious diseases is necessary", 78.4% indicated that "the establishment of an infection control system in advance to prepare emerging infectious diseases in the hospital is necessary", and 74.2% stated that "the establishment of an educational system for responding to emerging infectious diseases is necessary.". CONCLUSION: In conclusion, during the pandemic, in addition to inpatient care, Japanese hospitalists provided outpatient care for COVID-19, which is the role of primary care physicians in other countries. Furthermore, Japanese hospitalists who experienced the COVID-19 pandemic expressed the need for personnel development and education to prepare for future emerging infectious disease pandemics.

DOI： 10.2147/RMHP.S422412

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Ossification of the Posterior Longitudinal Ligament Caused by X-linked Hypophosphatemia Reviewed

JMA journal 2023

Cryptococcal Meningitis Developing in a Patient with Neurosarcoidosis Reviewed

Shinnosuke Fukushima, Hideharu Hagiya, Yukichika Yamamoto, Kohei Oguni, Kou Hasegawa, Fumio Otsuka

Internal Medicine 2023

Characteristics of Sleep Disturbance in Patients with Long COVID: A Retrospective Observational Study in Japan. Reviewed International journal

Naruhiko Sunada, Yasuhiro Nakano, Yuki Otsuka, Kazuki Tokumasu, Hiroyuki Honda, Yasue Sakurada, Yui Matsuda, Toru Hasegawa, Daisuke Omura, Kanako Ochi, Hideharu Hagiya, Keigo Ueda, Hitomi Kataoka, Fumio Otsuka

Journal of clinical medicine 11 ( 24 ) 2022.12

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

OBJECTIVES: The objective of this study was to determine the clinical and endocrinological features of sleep disturbance in patients with long COVID. METHODS: This study was a single-center retrospective observational study for patients who visited the COVID-19 aftercare outpatient clinic (CAC) established in Okayama University Hospital in Japan during the period from 15 February 2021 to 29 July 2022. The long COVID patients were divided into two groups based on the presence or absence of sleep disturbance, and the clinical and laboratory characteristics of the patients were analyzed. RESULTS: Out of 363 patients with long COVID, after excluding 6 patients, 60 patients (16.5%) (55% males, median age of 38 years) complaining of sleep disturbance were compared with 303 patients (83.5%) (43% males, median age of 40 years) without sleep-related symptoms. Although there were no significant differences in clinical backgrounds and severities of COVID-19 between the two groups by the multivariate analysis, the percentage of long COVID patients with sleep disturbance was significantly increased among patients infected in the Omicron-dominant phase. In addition, the prevalence rate of sleep disturbance in patients when infected in the Omicron phase (24.8%) was two-times higher than that in patients infected in the Delta phase (12.8%). Of note, the percentages of patients with sleep disturbance who also complained of general fatigue, headache, concentration loss, anxiety, low-grade fever, and brain fog symptoms were higher than the percentages of patients without sleep disturbance who had the same complaints. Among the types of sleep disturbance, the percentage of patients who complained of loss of sleep induction (75%) was much higher than the percentage of patients with early-awakening sleep disturbance (6.7%), and many of the patients with mid-awakening types of insomnia had brain fog symptoms. Endocrine examinations revealed that long COVID patients with sleep disturbance had significantly higher levels of plasma adrenocorticotropin and lower levels of serum growth hormone, suggesting the presence of hypothalamic-pituitary stress. CONCLUSION: The prevalence of sleep disturbance has been increasing in long COVID patients infected in the Omicron phase with a certain clinical and endocrine trend.

DOI： 10.3390/jcm11247332

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Key signs indicating mesenteric panniculitis Reviewed

Koichiro Yamamoto, Hiroyuki Honda, Hiroko Ogawa, Fumio Otsuka

Clinical Case Reports 10 ( 12 ) 2022.12

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