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Editor, Senior Moderator
BMJ Open. 2019 Jan 17;9(1):e024687. doi: 10.1136/bmjopen-2018-024687.
[h=1]Incidence of hospitalisation for severe complications of influenza virus infection in Japanese patients between 2012 and 2016: a cross-sectional study using routinely collected administrative data.[/h] Yokomichi H[SUP]1[/SUP], Mochizuki M[SUP]2[/SUP], Lee JJ[SUP]3[/SUP], Kojima R[SUP]1[/SUP], Yokoyama T[SUP]4[/SUP], Yamagata Z[SUP]1[/SUP].
[h=3]Author information[/h]
[h=3]Abstract[/h] [h=4]OBJECTIVE:[/h] To calculate the incidence of hospitalisation due to acute respiratory failure, pneumonia, acute respiratory distress syndrome (ARDS), febrile seizures and encephalitis/encephalopathy among influenza-positive patients in Japan, where point-of-care tests are routinely used to diagnose influenza.
[h=4]DESIGN:[/h] A cross-sectional study using routinely collected data.
[h=4]SETTING:[/h] Japanese clinics and hospitals between 2012 and 2016.
[h=4]PARTICIPANTS:[/h] Japanese patients aged 0-74 years diagnosed with influenza by a rapid test in employment-related health insurance records.
[h=4]PRIMARY OUTCOME MEASURES:[/h] Incidence of hospitalisation per 100 000 influenza-positive episodes.
[h=4]RESULTS:[/h] We included over 16 million influenza-positive episodes, 1.0% of whom were hospitalised. Of these, 3361 were acute respiratory failure, 27 253 pneumonia, 18 ARDS, 2603 febrile seizure and 159 encephalitis/encephalopathy. The percentage of hospitalisations by age was 2.96% of patients aged 0-1 years, 0.77% aged 2-5, 0.51% aged 6-12, 0.78% aged 13-18, 1.36% aged 19-44, 1.19% aged 45-64, and 2.21% aged 65-74. The incidence of hospitalisations from these five complications combined was highest in influenza-positive patients aged 0-1 years (943 per 100 000) compared with 307 in those aged 2-5 years and 271 in those aged 65-74 years. For pneumonia, the incidence was highest for influenza-positive patients aged 0-5 years and 65 years or more. There were statistically significant decreasing trends over the years in the incidence of all-cause hospitalisations, pneumonia and febrile seizures.
[h=4]CONCLUSIONS:[/h] Japanese administrative data revealed that 1.0% of influenza-positive patients aged under 75 years were hospitalised. Male patients had a higher incidence of pulmonary complications and febrile seizures. Children aged 0-5 years and adults aged 65-74 years were at high risk of being admitted to hospital for pneumonia.
? Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.
[h=4]KEYWORDS:[/h] febrile seizure; hospitalisation; influenza; influenza encephalitis; influenza encephalopathy; pneumonia
PMID: 30782739 PMCID: PMC6340484 DOI: 10.1136/bmjopen-2018-024687
Free PMC Article
[h=1]Incidence of hospitalisation for severe complications of influenza virus infection in Japanese patients between 2012 and 2016: a cross-sectional study using routinely collected administrative data.[/h] Yokomichi H[SUP]1[/SUP], Mochizuki M[SUP]2[/SUP], Lee JJ[SUP]3[/SUP], Kojima R[SUP]1[/SUP], Yokoyama T[SUP]4[/SUP], Yamagata Z[SUP]1[/SUP].
[h=3]Author information[/h]
[h=3]Abstract[/h] [h=4]OBJECTIVE:[/h] To calculate the incidence of hospitalisation due to acute respiratory failure, pneumonia, acute respiratory distress syndrome (ARDS), febrile seizures and encephalitis/encephalopathy among influenza-positive patients in Japan, where point-of-care tests are routinely used to diagnose influenza.
[h=4]DESIGN:[/h] A cross-sectional study using routinely collected data.
[h=4]SETTING:[/h] Japanese clinics and hospitals between 2012 and 2016.
[h=4]PARTICIPANTS:[/h] Japanese patients aged 0-74 years diagnosed with influenza by a rapid test in employment-related health insurance records.
[h=4]PRIMARY OUTCOME MEASURES:[/h] Incidence of hospitalisation per 100 000 influenza-positive episodes.
[h=4]RESULTS:[/h] We included over 16 million influenza-positive episodes, 1.0% of whom were hospitalised. Of these, 3361 were acute respiratory failure, 27 253 pneumonia, 18 ARDS, 2603 febrile seizure and 159 encephalitis/encephalopathy. The percentage of hospitalisations by age was 2.96% of patients aged 0-1 years, 0.77% aged 2-5, 0.51% aged 6-12, 0.78% aged 13-18, 1.36% aged 19-44, 1.19% aged 45-64, and 2.21% aged 65-74. The incidence of hospitalisations from these five complications combined was highest in influenza-positive patients aged 0-1 years (943 per 100 000) compared with 307 in those aged 2-5 years and 271 in those aged 65-74 years. For pneumonia, the incidence was highest for influenza-positive patients aged 0-5 years and 65 years or more. There were statistically significant decreasing trends over the years in the incidence of all-cause hospitalisations, pneumonia and febrile seizures.
[h=4]CONCLUSIONS:[/h] Japanese administrative data revealed that 1.0% of influenza-positive patients aged under 75 years were hospitalised. Male patients had a higher incidence of pulmonary complications and febrile seizures. Children aged 0-5 years and adults aged 65-74 years were at high risk of being admitted to hospital for pneumonia.
? Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.
[h=4]KEYWORDS:[/h] febrile seizure; hospitalisation; influenza; influenza encephalitis; influenza encephalopathy; pneumonia
PMID: 30782739 PMCID: PMC6340484 DOI: 10.1136/bmjopen-2018-024687
Free PMC Article