Masaki, Katsunori

写真a

Affiliation

School of Medicine, Department of Internal Medicine (Pulmonary Medicine) (Shinanomachi)

Position

Instructor
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Papers 【 Display / hide 】

  • Impact of accumulative smoking exposure and chronic obstructive pulmonary disease on COVID-19 outcomes: report based on findings from the Japan COVID-19 task force.

    Watase M, Masaki K, Chubachi S, Namkoong H, Tanaka H, Lee H, Fukushima T, Otake S, Nakagawara K, Kusumoto T, Asakura T, Kamata H, Ishii M, Hasegawa N, Oyamada Y, Harada N, Ueda T, Ueda S, Ishiguro T, Arimura K, Saito F, Yoshiyama T, Nakano Y, Mutoh Y, Suzuki Y, Edahiro R, Sano H, Sato Y, Okada Y, Koike R, Kitagawa Y, Tokunaga K, Kimura A, Imoto S, Miyano S, Ogawa S, Kanai T, Fukunaga K, Japan COVID-19 Task Force

    International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases 128   121 - 127 2022.12

    ISSN  1201-9712

  • Characteristics of hospitalized patients with COVID-19 during the first to fifth waves of infection: a report from the Japan COVID-19 Task Force

    Lee H., Chubachi S., Namkoong H., Asakura T., Tanaka H., Otake S., Nakagawara K., Morita A., Fukushima T., Watase M., Kusumoto T., Masaki K., Kamata H., Ishii M., Hasegawa N., Harada N., Ueda T., Ueda S., Ishiguro T., Arimura K., Saito F., Yoshiyama T., Nakano Y., Mutoh Y., Suzuki Y., Murakami K., Okada Y., Koike R., Kitagawa Y., Kimura A., Imoto S., Miyano S., Ogawa S., Kanai T., Fukunaga K.

    BMC infectious diseases (BMC infectious diseases)  22 ( 1 ) 935 2022.12

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    BACKGROUND: We aimed to elucidate differences in the characteristics of patients with coronavirus disease 2019 (COVID-19) requiring hospitalization in Japan, by COVID-19 waves, from conventional strains to the Delta variant. METHODS: We used secondary data from a database and performed a retrospective cohort study that included 3261 patients aged ≥ 18 years enrolled from 78 hospitals that participated in the Japan COVID-19 Task Force between February 2020 and September 2021. RESULTS: Patients hospitalized during the second (mean age, 53.2 years [standard deviation {SD}, ± 18.9]) and fifth (mean age, 50.7 years [SD ± 13.9]) COVID-19 waves had a lower mean age than those hospitalized during the other COVID-19 waves. Patients hospitalized during the first COVID-19 wave had a longer hospital stay (mean, 30.3 days [SD ± 21.5], p < 0.0001), and post-hospitalization complications, such as bacterial infections (21.3%, p < 0.0001), were also noticeable. In addition, there was an increase in the use of drugs such as remdesivir/baricitinib/tocilizumab/steroids during the latter COVID-19 waves. In the fifth COVID-19 wave, patients exhibited a greater number of presenting symptoms, and a higher percentage of patients required oxygen therapy at the time of admission. However, the percentage of patients requiring invasive mechanical ventilation was the highest in the first COVID-19 wave and the mortality rate was the highest in the third COVID-19 wave. CONCLUSIONS: We identified differences in clinical characteristics of hospitalized patients with COVID-19 in each COVID-19 wave up to the fifth COVID-19 wave in Japan. The fifth COVID-19 wave was associated with greater disease severity on admission, the third COVID-19 wave had the highest mortality rate, and the first COVID-19 wave had the highest percentage of patients requiring mechanical ventilation.

  • Clinical clustering with prognostic implications in Japanese COVID-19 patients: report from Japan COVID-19 Task Force, a nation-wide consortium to investigate COVID-19 host genetics

    Otake S., Chubachi S., Namkoong H., Nakagawara K., Tanaka H., Lee H., Morita A., Fukushima T., Watase M., Kusumoto T., Masaki K., Kamata H., Ishii M., Hasegawa N., Harada N., Ueda T., Ueda S., Ishiguro T., Arimura K., Saito F., Yoshiyama T., Nakano Y., Mutoh Y., Suzuki Y., Murakami K., Okada Y., Koike R., Kitagawa Y., Kimura A., Imoto S., Miyano S., Ogawa S., Kanai T., Fukunaga K.

    BMC Infectious Diseases (BMC Infectious Diseases)  22 ( 1 ) 735 2022.12

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    Background: The clinical course of coronavirus disease (COVID-19) is diverse, and the usefulness of phenotyping in predicting the severity or prognosis of the disease has been demonstrated overseas. This study aimed to investigate clinically meaningful phenotypes in Japanese COVID-19 patients using cluster analysis. Methods: From April 2020 to May 2021, data from inpatients aged ≥ 18 years diagnosed with COVID-19 and who agreed to participate in the study were collected. A total of 1322 Japanese patients were included. Hierarchical cluster analysis was performed using variables reported to be associated with COVID-19 severity or prognosis, namely, age, sex, obesity, smoking history, hypertension, diabetes mellitus, malignancy, chronic obstructive pulmonary disease, hyperuricemia, cardiovascular disease, chronic liver disease, and chronic kidney disease. Results: Participants were divided into four clusters: Cluster 1, young healthy (n = 266, 20.1%); Cluster 2, middle-aged (n = 245, 18.5%); Cluster 3, middle-aged obese (n = 435, 32.9%); and Cluster 4, elderly (n = 376, 28.4%). In Clusters 3 and 4, sore throat, dysosmia, and dysgeusia tended to be less frequent, while shortness of breath was more frequent. Serum lactate dehydrogenase, ferritin, KL-6, d-dimer, and C-reactive protein levels tended to be higher in Clusters 3 and 4. Although Cluster 3 had a similar age as Cluster 2, it tended to have poorer outcomes. Both Clusters 3 and 4 tended to exhibit higher rates of oxygen supplementation, intensive care unit admission, and mechanical ventilation, but the mortality rate tended to be lower in Cluster 3. Conclusions: We have successfully performed the first phenotyping of COVID-19 patients in Japan, which is clinically useful in predicting important outcomes, despite the simplicity of the cluster analysis method that does not use complex variables.

  • Effects of mild obesity on outcomes in Japanese patients with COVID-19: a nationwide consortium to investigate COVID-19 host genetics

    Lee H., Chubachi S., Namkoong H., Tanaka H., Otake S., Nakagawara K., Morita A., Fukushima T., Watase M., Kusumoto T., Masaki K., Kamata H., Ishii M., Hasegawa N., Harada N., Ueda T., Ueda S., Ishiguro T., Arimura K., Saito F., Yoshiyama T., Nakano Y., Mutoh Y., Suzuki Y., Murakami K., Okada Y., Koike R., Kitagawa Y., Kimura A., Imoto S., Miyano S., Ogawa S., Kanai T., Fukunaga K.

    Nutrition and Diabetes (Nutrition and Diabetes)  12 ( 1 ) 38 2022.12

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    Background: Obesity is reported to be a risk factor for severe disease in patients with coronavirus disease 2019 (COVID-19). However, there are no specific reports on the risk of severe disease according to body mass index (BMI) in Japan. Thus, this study aimed to investigate the effect of obesity stratified by BMI on the severity of COVID-19 in the general Japanese population. Methods: From February 2020 to May 2021, 1 837 patients aged ≥18 years were enrolled in the Japan COVID-19 Task Force. Patients with known BMI and disease severity were analyzed. Severity was defined as critical if the patient was treated in the intensive care unit, required invasive mechanical ventilation, or died. Results: Class 1 obesity (25.0 ≤ BMI < 30.0 kg/m2), class 2 obesity (30.0 ≤ BMI < 35.0 kg/m2), and class 3 or 4 obesity (BMI ≥ 35 kg/m2) were present in 29%, 8%, and 3% of the cases, respectively. Multiple logistic regression analysis with known risk factors for critical illness indicated that class 2 obesity was an independent risk factor for oxygenation (adjusted odds ratio, 4.75) and critical cases (adjusted odds ratio, 1.81). Class 1 obesity and class 3 or 4 obesity were independent risk factors for oxygen administration (adjusted odds ratios 2.01 and 3.12, respectively), but not for critical cases. However, no differences in the mortality rates were observed between the BMI classes (P = 0.5104). Conclusion: Obesity is a risk factor for respiratory failure in Japanese patients with COVID-19, regardless of the degree of obesity. However, it may not cause severe COVID-19 in a dose–response relationship with BMI. COVID-19 patients with mild obesity may benefit from aggressive intensive care.

  • Impact of upper and lower respiratory symptoms on COVID-19 outcomes: a multicenter retrospective cohort study

    Nakagawara K., Chubachi S., Namkoong H., Tanaka H., Lee H., Azekawa S., Otake S., Fukushima T., Morita A., Watase M., Sakurai K., Kusumoto T., Asakura T., Masaki K., Kamata H., Ishii M., Hasegawa N., Harada N., Ueda T., Ueda S., Ishiguro T., Arimura K., Saito F., Yoshiyama T., Nakano Y., Mutoh Y., Suzuki Y., Edahiro R., Murakami K., Sato Y., Okada Y., Koike R., Kitagawa Y., Tokunaga K., Kimura A., Imoto S., Miyano S., Ogawa S., Kanai T., Fukunaga K.

    Respiratory Research (Respiratory Research)  23 ( 1 ) 315 2022.12

    ISSN  14659921

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    Background: Respiratory symptoms are associated with coronavirus disease 2019 (COVID-19) outcomes. However, the impacts of upper and lower respiratory symptoms on COVID-19 outcomes in the same population have not been compared. The objective of this study was to characterize upper and lower respiratory symptoms and compare their impacts on outcomes of hospitalized COVID-19 patients. Methods: This was a multicenter, retrospective cohort study; the database from the Japan COVID-19 Task Force was used. A total of 3314 COVID-19 patients were included in the study, and the data on respiratory symptoms were collected. The participants were classified according to their respiratory symptoms (Group 1: no respiratory symptoms, Group 2: only upper respiratory symptoms, Group 3: only lower respiratory symptoms, and Group 4: both upper and lower respiratory symptoms). The impacts of upper and lower respiratory symptoms on the clinical outcomes were compared. The primary outcome was the percentage of patients with poor clinical outcomes, including the need for oxygen supplementation via high-flow oxygen therapy, mechanical ventilation, and extracorporeal membrane oxygenation or death. Results: Of the 3314 COVID-19 patients, 605, 1331, 1229, and 1149 were classified as Group 1, Group 2, Group 3, and Group 4, respectively. In univariate analysis, patients in Group 2 had the best clinical outcomes among all groups (odds ratio [OR]: 0.21, 95% confidence interval [CI]: 0.11–0.39), while patients in Group 3 had the worst outcomes (OR: 3.27, 95% CI: 2.43–4.40). Group 3 patients had the highest incidence of pneumonia, other complications due to secondary infections, and thrombosis during the clinical course. Conclusions: Upper and lower respiratory tract symptoms had vastly different impacts on the clinical outcomes of COVID-19.

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Papers, etc., Registered in KOARA 【 Display / hide 】

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Reviews, Commentaries, etc. 【 Display / hide 】

  • How Can Dupilumab Cause Eosinophilic Pneumonia?

    Kurihara M., Masaki K., Matsuyama E., Fujioka M., Hayashi R., Tomiyasu S., Sasahara K., Sunata K., Asaoka M., Akiyama Y., Nishie M., Irie M., Tanosaki T., Kabata H., Fukunaga K.

    Biomolecules (Biomolecules)  12 ( 12 )  2022.12

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    Reports of eosinophilic pneumonia (EP) as a side effect of dupilumab administration are limited in previous studies. Herein, we report two cases in which EP developed subsequent to the administration of dupilumab for eosinophilic chronic rhinosinusitis (ECRS). Case 1: A 55-year-old woman presented with ECRS, eosinophilic otitis media, and bronchial asthma, and was treated with dupilumab for ECRS. Five weeks later, fever and dyspnea developed, and infiltration shadows were observed in her lungs. The peripheral blood eosinophil count (PBEC) was 3848/μL (26%), bronchoalveolar lavage fluid showed eosinophilic infiltration, and EP was subsequently diagnosed. Her condition improved following prednisolone treatment. Case 2: A 59-year-old man presented with fatigue and dyspnea after receiving dupilumab for ECRS. He had infiltrative shadows throughout his left lung field, and his PBEC was 4850/μL (26.5%). Prednisolone was initiated, and his condition improved. EP developed in both patients during the period of elevated PBEC after dupilumab administration, and dupilumab was suspected to be the causative agent in their EP. Hence, EP should be considered as a differential diagnosis when fever and dyspnea appear following dupilumab administration.

  • スパイロメトリーで中枢気道狭窄パターンを示し、診断・治療に繋がった2例

    古郡 理帆, 松岡 志保, 田邊 晃子, 正木 克宜, 山澤 稚子, 横田 浩充, 松下 弘道

    日本臨床検査医学会誌 ((一社)日本臨床検査医学会)  70 ( 補冊 ) 192 - 192 2022.10

    ISSN  2436-2727

  • 【シン・アレルギー診療　プライマリ・ケア領域のアレルギーアップデート】薬物療法　抗ヒスタミン薬以外の抗アレルギー薬

    松山 笑子, 正木 克宜

    治療 ((株)南山堂)  104 ( 10 ) 1201 - 1204 2022.10

    ISSN  0022-5207

  • アレルギー診療スキルアップ講座(No.10)　食物アレルギー　成人編

    正木 克宜

    新薬と臨牀 ((株)医薬情報研究所)  71 ( 9 ) 973 - 979 2022.09

    ISSN  0559-8672

  • アレルギー診療における抗ヒスタミン薬・汎用薬を見直す　気管支喘息に適応のある抗ヒスタミン薬,鎮咳薬,去痰薬

    林 玲奈, 正木 克宜

    Allos Ergon ((同)クリニコ出版)  2 ( 3 ) 741 - 745 2022.09

    ISSN  2436-3820

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Courses Taught 【 Display / hide 】

  • PHYSIOLOGY 2

    2025

  • LECTURE SERIES, INTERNAL MEDICINE (PULMONOLOGY)

    2025

  • INTRODUCTION TO CLINICAL CLERKSHIPS

    2023

  • INTRODUCTION TO CLINICAL CLERKSHIPS

    2022

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