2024/02/02 更新

写真a

ワタナベ ヒロカズ
渡邉 宏和
WATANABE HIROKAZU
所属
医歯薬学域 助教(特任)
職名
助教(特任)
外部リンク

学位

  • 学士 ( 山口大学 )

研究キーワード

  • 早産児酸化ストレス

  • 早産児晩期循環不全

  • 一酸化窒素

研究分野

  • ライフサイエンス / 胎児医学、小児成育学  / 早産児晩期循環不全

  • ライフサイエンス / 胎児医学、小児成育学  / 早産児酸化ストレス

  • ライフサイエンス / 胎児医学、小児成育学  / 一酸化窒素

経歴

  • 岡山大学病院   小児科   助教

    2021年4月 - 現在

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  • 岡山大学病院   小児科   医員

    2019年4月 - 2021年3月

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  • 岡山医療センター   新生児科   医師

    2018年4月 - 2019年3月

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  • 東京女子医科大学病院   母子総合医療センター新生児科   医療練士

    2016年4月 - 2018年3月

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論文

  • Postnatal longitudinal analysis of serum Nitric oxide and eosinophil counts in extremely preterm infants. 国際誌

    Hirokazu Watanabe, Yosuke Washio, Kei Tamai, Daisaku Morimoto, Tomoka Okamura, Junko Yoshimoto, Hidehiko Nakanishi, Misao Kageyama, Atsushi Uchiyama, Hirokazu Tsukahara, Satoshi Kusuda

    Pediatrics and neonatology   2023年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: Nitric oxide (NO) may be related to the pathogenesis of several morbidities in extremely preterm infants, including late-onset adrenal insufficiency. However, eosinophilia is observed under pathological conditions with adrenal insufficiency. Therefore, this study explored postnatal changes in NO levels and eosinophil counts in extremely preterm infants with and without morbidities. METHODS: Nineteen extremely preterm infants with a median gestational age of 27.0 weeks and median birth weight of 888 g were enrolled in this study. Serum levels of nitrogen oxides (NOx) and peripheral blood eosinophil counts were measured at birth and every 2 weeks thereafter. Morbidities of the study group were diagnosed using a single criterion. RESULTS: Serum NOx levels (mean ± standard deviation) were 22.5 ± 14.9 μmol/L, 51.2 ± 23.7 μmol/L, 42.4 ± 15.2 μmol/L, and 33.8 ± 9.4 μmol/L at birth and 2, 4, and 6 weeks of age, respectively. The serum NOx level at 2 weeks of age was significantly higher than that at birth and 6 weeks of age. Eosinophil counts, which increase with adrenal insufficiency, were measured simultaneously and were 145 ± 199/μL, 613 ± 625/μL, 466 ± 375/μL, and 292 ± 228/μL at birth and 2, 4, and 6 weeks of age, respectively. These values showed that the eosinophil count was significantly higher at 2 weeks of age than at birth and 6 weeks of age. The serum NOx level of infants without chorioamnionitis was significantly increased at 4 weeks of age, and the eosinophil count of infants with necrotizing enterocolitis was significantly increased at 2 weeks of age. No correlation with the NOx level or eosinophil count was observed in infants with late-onset circulatory collapse. CONCLUSION: The postnatal serum NOx level and eosinophil count were significantly correlated with each other and peaked at 2 weeks of age.

    DOI: 10.1016/j.pedneo.2023.08.006

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  • 機械学習による血中ビリルビン推定とABO不適合における光線療法基準の評価

    森本 大作, 福田 花奈, 佐藤 剛史, 岡村 朋香, 渡邉 宏和, 鷲尾 洋介, 吉本 順子, 塚原 宏一

    日本周産期・新生児医学会雑誌   59 ( Suppl.1 )   P273 - P273   2023年6月

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    記述言語:日本語   出版者・発行元:(一社)日本周産期・新生児医学会  

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  • Longitudinal Measurement of Histidine-Rich Glycoprotein Levels in Bronchopulmonary Dysplasia: A Pilot Study. 国際誌

    Daisaku Morimoto, Yosuke Washio, Kei Tamai, Takeshi Sato, Tomoka Okamura, Hirokazu Watanabe, Yu Fukushima, Junko Yoshimoto, Misao Kageyama, Kenji Baba, Hirokazu Tsukahara

    Biomedicines   11 ( 1 )   2023年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Histidine-rich glycoprotein (HRG) has been reported to inhibit signaling leading to the release of high mobility group box 1 protein, a damage-associated molecular pattern. The present study aimed to determine the longitudinal change in HRG levels in extremely preterm infants and assess whether complications such as bronchopulmonary dysplasia (BPD) were associated with differences in HRG levels. In this multicenter, prospective, observational study, we measured serum HRG levels every 2 weeks from birth to 8 weeks of age. Serum HRG was measured using an enzyme-linked immunosorbent assay. We included 19 extremely preterm infants in the study and 74 samples were analyzed. The median gestational age was 26.0 weeks, and the median birth weight was 858 g. Serum HRG levels showed a significant upward trend after birth (p < 0.001); median HRG concentrations at birth and at 2, 4, 6, and 8 weeks of age were 1.07, 1.11, 2.86, 6.05, and 7.49 µg/mL, respectively. Onset of BPD was not associated with differences in serum HRG levels. Further, the serum HRG levels increased significantly after birth in extremely preterm infants.

    DOI: 10.3390/biomedicines11010212

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  • Prediction model for nonopiate-induced neonatal abstinence syndrome. 国際誌

    Daisaku Morimoto, Yosuke Washio, Takeshi Sato, Tomoka Okamura, Hirokazu Watanabe, Junko Yoshimoto, Hirokazu Tsukahara

    Pediatrics international : official journal of the Japan Pediatric Society   65 ( 1 )   e15435   2022年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: Neonatal abstinence syndrome (NAS) induced by opiate use is common worldwide. While psychiatric drugs are a more common cause of NAS in Japan, infants of mothers taking psychiatric medications do not always develop NAS. The purpose of this study was to develop a practical model for predicting the onset of nonopiate-induced NAS using variables available at birth. METHODS: In this diagnostic study, prediction models were developed using multivariable logistic regression with retrospective data collected at our hospital between 2010 and 2019. NAS diagnosis was based on the Isobe score, and maternal medications were converted to dose equivalents. RESULTS: A total of 164 maternal and infant dyads met the inclusion criteria; 91 were included in the analysis, of whom 29 infants (32%) were diagnosed with NAS. Final models were created with and without the drug indices. The model without the drug indices consisted of neonatal head circumference in z-score and Apgar score at 5 minutes < 9, and the model with the drug indices included these, as well as antipsychotics and hypnotics indices. The C-statistics were 0.747 (95% CI: 0.638-0.856), and 0.795 (95% CI: 0.683-0.907), respectively, indicating good predictive accuracy of NAS onset for the models. CONCLUSIONS: This study developed models that predicted nonopiate-induced NAS with good accuracy, which may be further improved through the use of drug indices.

    DOI: 10.1111/ped.15435

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  • Head circumference in infants with nonopiate-induced neonatal abstinence syndrome. 国際誌

    Daisaku Morimoto, Yosuke Washio, Kazuki Hatayama, Tomoka Okamura, Hirokazu Watanabe, Junko Yoshimoto, Hirokazu Tsukahara

    CNS spectrums   26 ( 5 )   509 - 512   2021年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: No relationship has been reported between nonopiate neonatal abstinence syndrome (NAS) and anthropometric indices, including head circumference (HC). The purpose of this study was to determine the relationship between maternal nonopioid drug use and HC at birth in neonates with NAS. METHODS: This retrospective observational study included neonates born between January 1, 2010 and March 31, 2019, whose mothers had been taking antipsychotic, antidepressant, sedative, or anticonvulsant medications. The outcome measures were HCs of NAS infants and controls. RESULTS: Of 159 infants, 33 (21%) were diagnosed with NAS. There was no maternal opioid use among mothers during pregnancy. The HCs in the NAS group were significantly smaller than those in the control group. The median z-scores for HC at birth were -0.20 and 0.29 in the NAS group and the control group, respectively (P = .011). The median HCs at birth were 33.0 and 33.5 cm in the NAS group and the control group, respectively. Multivariate analysis revealed that maternal antipsychotic drug use and selective serotonin reuptake inhibitors were independently associated with NAS (P < .001 and P = .004, respectively). Notably, benzodiazepine use and smoking were not independent risk factors. CONCLUSIONS: The results suggest an association between maternal antipsychotic drug use and NAS, which was further associated with decreased HC. Careful monitoring of maternal drug use should be considered to improve fetal outcomes.

    DOI: 10.1017/S1092852920001522

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  • Association Between Eosinophilia and Late-onset Circulatory Collapse in Preterm Infants: A case-Control Study.

    Tomoka Okamura, Yosuke Washio, Hirokazu Watanabe, Hidehiko Nakanishi, Atsushi Uchiyama, Hirokazu Tsukahara, Satoshi Kusuda

    Acta medica Okayama   75 ( 4 )   505 - 509   2021年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Late-onset circulatory collapse (LCC) in preterm infants is presumably caused by relative adrenal insufficiency. Because eosinophilia is known to be associated with adrenal insufficiency, we attempted to clarify the relation-ship between eosinophilia and LCC in preterm infants. We divided the cases of the infants (born at < 28 weeks' gestation) admitted to our neonatal intensive care unit in 2008-2010 into 2 groups: those diagnosed with LCC that received glucocorticoids (LCC group), and those who did not receive glucocorticoids (control group). We compared eosinophil counts between the 2 groups and between before and after glucocorticoid treatment in the LCC group. A total of 28 infants were examined: LCC group (n = 12); control group (n = 16). The peak eosin-ophil counts of the LCC group were significantly higher than those of the control group (median: 1.392 × 109/L vs. 1.033 × 109/L, respectively; p = 0.02). Additionally, in the LCC group, the eosinophil counts declined significantly after glucocorticoid treatment (0.877 × 109/L vs. 0.271 × 109/L, p = 0.003). Eosinophil counts in the LCC group were significantly higher than in the control group and decreased rapidly after gluco-corticoid treatment. These results indicate that eosinophilia may be a factor associated with LCC caused by adrenal insufficiency.

    DOI: 10.18926/AMO/62403

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  • Population-based longitudinal study showed that children born small for gestational age faced a higher risk of hospitalisation during early childhood. 国際誌

    Junko Yoshimoto, Takashi Yorifuji, Yosuke Washio, Tomoka Okamura, Hirokazu Watanabe, Hiroyuki Doi, Hirokazu Tsukahara

    Acta paediatrica (Oslo, Norway : 1992)   108 ( 3 )   473 - 478   2019年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    AIM: We examined the effects of being born small for gestational age (SGA) on the risk of being hospitalised for common diseases during childhood. METHODS: This Japanese nationwide, population-based longitudinal survey followed babies born before 42 weeks of gestation from 10 to 17 January and from 10 to 17 July 2001, using data from the Government's Longitudinal Survey of Babies in the 21st Century. Our study followed 41 268 children until 5.5 years of age: 39 107 full term (8.7% SGA) and 2161 preterm (15.5% SGA). We evaluated the relationship between SGA status and hospitalisation using their history of hospitalisation for common diseases and comparing full-term or preterm births. Logistic regression analysis, adjusted for potential confounders, estimated the odds ratios (ORs) and 95% confidence intervals (CIs). RESULTS: The full-term and preterm children who were born SGA were more likely to be hospitalised during infancy and early childhood than those born non SGA. The ORs for hospitalisation from six months to 18 months of age were 1.23 (95% CI: 1.10-1.37) for full-term and 1.67 (95% CI: 1.23-2.25) for preterm subjects. Higher risks of hospitalisation due to bronchitis, pneumonia, bronchial asthma and diarrhoea were also observed. CONCLUSION: Being born SGA was associated with all-cause and cause-specific hospitalisation in early childhood, particularly for term infants.

    DOI: 10.1111/apa.14507

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  • Small for gestational age is a risk factor for the development of delayed thyrotropin elevation in infants weighing less than 2000 g. 国際誌

    Atsushi Uchiyama, Hirokazu Watanabe, Hidehiko Nakanishi, Satsuki Totsu

    Clinical endocrinology   89 ( 4 )   431 - 436   2018年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    OBJECTIVE: Delayed thyrotropin (TSH) elevation (dTSHe) is common in low birthweight infants. We aimed to clarify the risk factors for the development of dTSHe in infants weighing <2000 g at birth. PATIENTS AND METHODS: According to Japanese guidelines, infants with birthweight <2000 g underwent second capillary TSH screening within 30 days, either at 1 month of age; or when weight reached 2.5 kg; or at discharge. dTSHe was defined as TSH >20 mIU/L by venous sampling following a normal result (<15 mIU/L) at first screening aged 4-6 days. For each infant who developed dTHSe three babies without dTSHe were selected and matched for gestational age and birth year. Small for gestational age (SGA) was defined as a birthweight <10th percentile for the gestational age and sex. A multivariate analysis was performed to identify risk factors for the development of dTSHe. RESULTS: Among the 911 study infants, 17 infants (1.9%) had dTSHe. The median (range) birthweight in the dTSHe group (796 [388-1912] g) was significantly smaller than the comparison group (961 [408-1981] g) (P = 0.04). The number (%) of SGA infants was significantly higher in the dTSHe group (12 [71%]) than in the comparison group (13 [25%]) (P = 0.001). The multivariate analysis revealed that SGA was an independent risk factor for the development of dTSHe (adjusted odds ratio, 9.0; 95% confidence interval, 2.5-32.8; P = 0.001). CONCLUSIONS: Small for gestational age is an independent risk factor for the development of dTSHe in infants with a birthweight <2000 g. The influence of prematurity, a matching criterion for this study, on dTSHe requires additional study.

    DOI: 10.1111/cen.13793

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  • Positive Minimal Residual Disease of FLT3-ITD before Hematopoietic Stem Cell Transplantation Resulted in a Poor Prognosis of an Acute Myeloid Leukemia.

    Yuka Iwasaki, Rituo Nishiuchi, Michinori Aoe, Takahide Takahashi, Hirokazu Watanabe, Chiho Tokorotani, Kiyoshi Kikkawa, Akira Shimada

    Acta medica Okayama   71 ( 1 )   79 - 83   2017年2月

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    記述言語:英語  

    Acute myeloid leukemia (AML) patients with fms-related tyrosine kinase 3 (FLT3)-internal tandem duplication (ITD) often have a poor prognosis, even after hematopoietic stem cell transplantation (HSCT). We report a case of AML with FLT3-ITD identified upon initial diagnosis, who received HSCT at complete remission after 3 consecutive chemotherapies. However, the patient relapsed when the same FLT3-ITD clone emerged, and finally died. Retrospective analysis revealed an allelic ratio of FLT3-ITD/wild type of 1.1 and 0.0096 upon initial diagnosis and before HSCT, respectively. The detection of any minimal residual FLT3-ITD clone before HSCT is useful in the treatment of AML with FLT3-ITD.

    DOI: 10.18926/AMO/54829

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  • Verification of risk scores to predict i.v. immunoglobulin resistance in incomplete Kawasaki disease. 国際誌

    Kiichiro Kanamitsu, Hisako Kakimoto, Akira Shimada, Yusei Nakata, Hiroaki Ochi, Hirokazu Watanabe, Yuka Iwasaki, Chiho Tokorodani, Akane Kanazawa, Hidehiko Maruyama, Mari Miyazawa, Ritsuo Nishiuchi, Kiyoshi Kikkawa

    Pediatrics international : official journal of the Japan Pediatric Society   58 ( 2 )   146 - 51   2016年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: A recent study indicated the efficacy of the addition of prednisolone to i.v. immunoglobulin (IVIG) as initial treatment in patients with higher risk of IVIG resistance. Several different risk scores for predicting IVIG resistance have been proposed, mainly based on typical Kawasaki disease (KD) patients. We investigated the utility of the risk scores to predict IVIG resistance in incomplete KD. METHODS: Clinical records of incomplete KD patients who received a single dose of IVIG between 2005 and 2012 at Kochi Health Sciences Center were retrospectively reviewed. Patients were classified into an IVIG-responsive group and an IVIG-resistant group. The Kobayashi, Egami, and Sano risk scores were calculated for each patient and the proportion of high-risk patients was compared between the two groups for each risk score. RESULTS: For 51 incomplete KD patients, Kobayashi (66.7% vs 47.6%, P = 0.253), Egami (55.6% vs 38.1%, P = 0.274), and Sano (57.1% vs 10.8%, P = 0.068) risk scores identified a higher proportion of high-risk patients in the IVIG-resistant group compared with the IVIG-responsive group, but significant difference was not observed. Sano risk score had the highest OR (6.19; 95%CI: 1.00-38.26). CONCLUSIONS: The proportion of patients identified as being at high risk for IVIG resistance using the Kobayashi, Egami, and Sano risk scores, respectively, was not significantly different between the IVIG-responsive group and the IVIG-resistant group for incomplete KD. Among the three risk scores, the Sano risk score has the best ability to predict IVIG resistance in incomplete KD.

    DOI: 10.1111/ped.12755

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  • Ventriculoperitoneal shunt outcomes among infants.

    Hidehiko Maruyama, Yusei Nakata, Akane Kanazawa, Hirokazu Watanabe, Yusuke Shigemitsu, Yuka Iwasaki, Chiho Tokorodani, Mari Miyazawa, Ritsuo Nishiuchi, Kiyoshi Kikkawa

    Acta medica Okayama   69 ( 2 )   87 - 93   2015年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Ventriculoperitoneal shunts (VPSs) are used for the treatment of hydrocephalus. Here we analyzed the outcomes of VPS placements in 24 infants to determine the risk factors for shunt failure. The infants had undergone the initial VPS operation in our hospital between March 2005 and December 2013. They were observed until the end of January 2014. We obtained Kaplan-Meier curves and performed a multivariate Cox regression analysis of shunt failure. Of the 24 cases, the median (range) values for gestational age, birth weight, and birth head circumference (HC) were 37 (27-39) wks, 2,736 (686-3,788) g, and 35.3 (23.0-45.3) cm, respectively. The total number of shunt procedures was 45. Shunt failure rates were 0.51/shunt and 0.0053/shunt/year. Shunt infection rates were 0.13/shunt and 0.0014/shunt/year. The Kaplan-Meier analysis revealed an increased risk for shunt failure in infants <1 month old or in the HC >90%tile. The Cox regression analysis yielded hazard ratios (HRs) of 2.93(95% confidence interval (CI), 0.96-10.95, p=0.059) for age <1 month, and 4.46 (95%CI:1.20-28.91, p=0.023) for the HC >90%tile. The multivariate Cox regression analysis showed adjusted HRs of 17.56 (95%CI:2.69-202.8, p=0.001) for age <1 month, and 2.95 (95%CI:0.52-24.84, p=0.228) for the HC >90%tile. Our findings thus revealed that the risk factors for shunt failure in infants include age <1 month at the initial VPS placement.

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  • Changes in the features of invasive pneumococcal disease after introduction of the seven-valent pneumococcal conjugate vaccine in a regional core hospital of Kochi, Japan.

    Hiroyuki Miyahara, Hidehiko Maruyama, Akane Kanazawa, Yuka Iwasaki, Yusuke Shigemitsu, Hirokazu Watanabe, Chiho Tokorodani, Mari Miyazawa, Yusei Nakata, Ritsuo Nishiuchi, Kiyoshi Kikkawa

    Acta medica Okayama   69 ( 4 )   255 - 60   2015年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Since the introduction of the seven-valent pneumococcal conjugate vaccine (PCV7) in 2007, invasive pneumococcal disease has declined, but the incidence of Streptococcus pneumoniae serotype 19A has risen worldwide. The present study examined changes in the features of invasive pneumococcal disease since the introduction of the PCV7 in Kochi, Japan. Pediatric cases of invasive pneumococcal disease were investigated before and after vaccine introduction (January 2008 to December 2013). Cases of invasive pneumococcal disease tended to decrease after PCV7 introduction. In addition, before introduction of the vaccine, most serotypes causing invasive pneumococcal disease were those included in the vaccine. However, after the introduction, we found cases infected by serotypes not covered by vaccine. Penicillin-resistant S. pneumoniae was the predominant serotype causing invasive pneumococcal disease before introduction of the PCV7, and the susceptibility of this serotype to antibiotics improved after vaccine introduction. Serotype isolates identified after vaccine introduction were also relatively susceptible to antibiotic therapy, but decreased susceptibility is expected.

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  • Reliability of a rapid test for the clinical diagnosis of influenza A/H1N1 2009. 国際誌

    Daisuke Harada, Ritsuo Nishiuchi, Yuka Iwasaki, Hirokazu Watanabe, Chiho Tokorodani, Akane Kanazawa, Hisako Kiguchi, Shin-Ichiro Gotoh, Mari Miyazawa, Yusei Nakata, Tsuneo Morishima, Kiyoshi Kikkawa

    Scandinavian journal of infectious diseases   44 ( 10 )   776 - 81   2012年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    BACKGROUND: The rapid diagnosis of a pandemic influenza A/H1N1 2009 (H1N1pdm) virus infection is required in ambulatory care settings, since early identification can prevent further transmission. However, the sensitivity of rapid influenza diagnostic tests (RIDTs) is still questionable, and specific indicators for H1N1pdm and/or false-negative results by RIDTs have not been clearly determined. METHODS: From June to December 2009, nasal swabs from 324 patients at Kochi Health Science Center were used for the diagnosis of infection by RIDT and reverse transcription polymerase chain reaction. RESULTS: The sensitivity of the RIDT was determined to be 80.0% and the specificity 97.1%. Multivariate analysis revealed that the frequencies of contagiousness and headache were significant in patients with H1N1pdm infection, in addition to common symptoms of respiratory infection. These data indicated that the H1N1pdm virus had high infectivity and was harmful to the endocranial environment. In the false-negative group, the time interval between onset and consultation was 5.5 ± 6.5 h (median ± interquartile range), which was significantly shorter than the 11.5 ± 7.0 h in the true-positive group. The sensitivity of the RIDT was significantly low during the time-period within 3 h from onset (56.0%); however after 4 h the sensitivity was determined to be >80%. These data indicated that the concentration of the virus in nasal swabs was elevated over the course of the disease. CONCLUSIONS: We have demonstrated that the RIDT is reliable for the diagnosis of H1N1pdm infection. Taking into consideration the time interval between onset and consultation and other features of H1N1pdm, such as contagiousness and headache, it may be necessary to re-test RIDT-negative cases later.

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▼全件表示

書籍等出版物

  • NICUグリーンノート

    内山, 温

    中外医学社  2017年10月  ( ISBN:9784498145542

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    総ページ数:v, 367p   記述言語:日本語

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