Kazuko Yamamoto

Dr. Kazuko Yamamoto

Department of Respiratory Medicine, Nagasaki University Hospital, Nagasaki, Japan
orcid

Research Focus & Metrics

Academic Career Length

25Years (2002-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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15 May 2024 in HIV Medicine
Verified
Journal Article
Open access
HNHideta Nakamura
Hideta Nakamura
KYKazuko Yamamoto
Kazuko Yamamoto
Objective: The 2022 global mpox outbreak disproportionately impacted people living with HIV. This review explores recent evidence on mpox in this group, focusing on clinical presentation, complications, treatment modalities and vaccine strategies.Recent findings: Recent studies have suggested that people with HIV diagnosed with mpox have a greater risk of proctitis and hospitalization compared with people without HIV. In addition, those with advanced immunosuppression face an elevated risk of severe mpox infection, which can lead to mortality. Comprehensive and prompt supportive care using antiretrovirals and mpox antivirals is crucial in this group. Although results from randomized clinical trials are still forthcoming, recent studies suggest that early initiation of tecovirimat can prevent disease progression in people with HIV. The non‐replicative attenuated smallpox vaccine is well tolerated and effective in preventing monkeypox virus infections in people with HIV. Further studies are needed regarding long‐term vaccine effectiveness for this population.Conclusion: Evaluating the risk of severe mpox in people living with HIV requires assessing the level of immune suppression and viral control. Universal access to vaccination is imperative to prevent the resurgence of future outbreaks.

29 December 2017 in BMC Pulmonary Medicine
Verified
Journal Article
Open access
PDF file
MTMasato Tashiro
Masato Tashiro
KFKiyohide Fushimi
Kiyohide Fushimi
KKKei Kawano
Kei Kawano
TTTakahiro Takazono
Takahiro Takazono
TSTomomi Saijo
Tomomi Saijo
KIKoichi Izumikawa
Koichi Izumikawa
There is conflicting evidence regarding the benefit of adjunctive corticosteroid therapy in patients with Mycoplasma pneumoniae pneumonia. We hypothesised that corticosteroid therapy could reduce mortality and length of stay (LOS) in such patients. Adult patients with M. pneumoniae pneumonia from January 2010 to December 2013 were identified from the Japanese Diagnosis Procedure Combination inpatient database. The effects of low-dose and high-dose corticosteroid therapies on mortality, LOS, drug costs and hyperglycaemia requiring insulin treatment were evaluated using propensity score analyses. Eligible patients (n = 2228) from 630 hospitals were divided into no-corticosteroid (n = 1829), low-dose corticosteroid (n = 267) and high-dose corticosteroid (n = 132) groups. The propensity score-matched pairs were generated from no-corticoid and low-dose corticoid groups (251 pairs), or no-corticoid and high-dose corticosteroid groups (120 pairs). Adjunctive corticosteroid therapy did not decrease 30-day mortality. In addition, both low-dose and high-dose corticosteroid therapies were associated with increases in LOS. Furthermore, hyperglycaemia requiring insulin treatment and drug cost increased with corticosteroid use. Adjunctive treatment with low-dose or high-dose corticosteroids may not be beneficial in M. pneumoniae pneumonia.

1 January 2016 in Internal Medicine
Verified
Journal Article
Open access
PDF file
YNYohsuke Nagayoshi
Yohsuke Nagayoshi
KYKazuko Yamamoto
Kazuko Yamamoto
SHSatoru Hashimoto
Satoru Hashimoto
KHKeiko Hisatomi
Keiko Hisatomi
SDSeiji Doi
Seiji Doi
SKShigeru Kohno
Shigeru Kohno
We herein report the first case of pulmonary metastasis with lepidic growth that originated from cholangiocarcinoma. A 77-year-old man was admitted to our hospital due to exertional dyspnea and liver dysfunction. Computed tomography showed widespread infiltration and a ground-glass opacity in the lung and dilation of the intrahepatic bile duct. The pulmonary lesion progressed rapidly, and the patient died of respiratory failure. Cholangiocarcinoma and lepidic pulmonary metastasis were pathologically diagnosed by an autopsy. Lepidic pulmonary growth is an atypical pattern of metastasis, and immunopathological staining is useful to distinguish pulmonary metastasis from extrapulmonary cancer and primary pulmonary adenocarcinoma.

25 January 2019 in European Journal of Clinical Microbiology & Infectious Diseases
Verified
Journal Article
Closed access
PDF file
TTTakahiro Takazono
Takahiro Takazono
TSTomomi Saijo
Tomomi Saijo
NANobuyuki Ashizawa
Nobuyuki Ashizawa
KOKazuhiro Oshima
Kazuhiro Oshima
KNKeitaro Nishimura
Keitaro Nishimura
DSDonald C. Sheppard
Donald C. Sheppard

23 April 2022 in Journal of Fungi
Verified
Journal Article
Open access
PDF file
YIYuya Ito
Yuya Ito
TTTakahiro Takazono
Takahiro Takazono
YOYasushi Obase
Yasushi Obase
SFSusumu Fukahori
Susumu Fukahori
NANobuyuki Ashizawa
Nobuyuki Ashizawa
HMHiroshi Mukae
Hiroshi Mukae
Allergic bronchopulmonary aspergillosis (ABPA) and chronic pulmonary aspergillosis (CPA) are important fungal infections caused by Aspergillus species. An overlap of ABPA and CPA has been reported; therefore, it is critical to determine whether the main pathology is ABPA or CPA and whether antifungals are required. In this study, we investigated whether the serum cytokine profile is useful for understanding the pathology and for differentiating between these diseases. We compared the various serum cytokine levels among healthy subjects and patients diagnosed with asthma, ABPA, or CPA at Nagasaki University Hospital between January 2003 and December 2018. In total, 14 healthy subjects, 19 patients with asthma, 11 with ABPA, and 10 with CPA were enrolled. Interleukin (IL) -5 levels were significantly higher in patients with ABPA than in those with CPA, and IL-33 and tumor necrosis factor (TNF) levels were significantly higher in patients with CPA than in those with asthma (p < 0.05, Dunn’s multiple comparison test). The sensitivity and specificity of the IL-10/IL-5 ratio (cutoff index 2.47) for diagnosing CPA were 70% and 100%, respectively. The serum cytokine profile is useful in understanding the pathology of ABPA and CPA, and the IL-10/IL-5 ratio may be a novel supplemental biomarker for indicating the pathology of CPA.

2 August 2022 in Journal of Clinical Medicine
Verified
Journal Article
Open access
PDF file
KFKenta Fujio
Kenta Fujio
JSJaemyoung Sung
Jaemyoung Sung
SNSatoru Nakatani
Satoru Nakatani
KYKazuko Yamamoto
Kazuko Yamamoto
MIMasao Iwagami
Masao Iwagami
TITakenori Inomata
Takenori Inomata
This study aimed to determine the characteristics and clinical ocular manifestations of acute corneal graft rejection after coronavirus disease 2019 (COVID-19) vaccination. We conducted an online search of the PubMed and EMBASE databases. Data on recipients’ characteristics, corneal transplantation types, interval between vaccination and allograft rejection, clinical manifestations, and graft rejection medication were extracted. Thirteen articles on 21 patients (23 eyes) with acute corneal graft rejection after COVID-19 vaccination, published between April and December 2021, were included. The median (interquartile range) age at the onset of rejection was 68 (27–83) years. Types of transplantation included penetrating keratoplasty (12 eyes), Descemet membrane endothelial keratoplasty (six eyes), Descemet stripping automated endothelial keratoplasty (four eyes), and living-related conjunctival-limbal allograft (one eye). The interval between vaccination and rejection ranged from 1 day to 6 weeks. Corneal edema was the leading clinical manifestation (20 eyes), followed by keratic precipitates (14 eyes) and conjunctival or ciliary injection (14 eyes). Medications included frequently applied topical corticosteroids (12 eyes), followed by a combination of topical and oral corticosteroids (four eyes). In addition, the clinical characteristics of corneal allograft rejection after COVID-19 vaccination were identified. Corneal transplant recipients may require further vaccination, necessitating appropriate management and treatment.