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Effectiveness of neuraminidase inhibitors in reducing mortality in patients admitted to hospital with influenza A H1N1pdm09 virus infection: an individual participant data meta-analysis

Identifieur interne : 000181 ( Hal/Curation ); précédent : 000180; suivant : 000182

Effectiveness of neuraminidase inhibitors in reducing mortality in patients admitted to hospital with influenza A H1N1pdm09 virus infection: an individual participant data meta-analysis

Auteurs : Stella G. Muthuri ; Sudhir Venkatesan ; Puja R. Myles ; Jo Leonardi-Bee ; Tarig S. A. Al Khuwaitir ; Adbullah Al Mamun ; Ashish P. Anovadiya ; Eduardo Azziz-Baumgartner ; Clarisa Báez ; Matteo Bassetti ; Bojana Beovic ; Barbara Bertisch ; Isabelle Bonmarin [France] ; Robert Booy ; Victor H. Borja-Aburto ; Heinz Burgmann ; Bin Cao [République populaire de Chine] ; Jordi Carratala ; Justin T. Denholm ; Samuel R. Dominguez ; Pericles A. D. Duarte ; Gal Dubnov-Raz ; Marcela Echavarria ; Sergio Fanella ; Zhancheng Gao [République populaire de Chine] ; Patrick Gérardin [Réunion] ; Maddalena Giannella ; Sophie Gubbels ; Jethro Herberg ; Anjarath L. H. Iglesias ; Peter H. Hoger ; Xiaoyun Hu ; Quazi T. Islam ; Mirela F. Jiménez ; Amr Kandeel ; Gerben Keijzers ; Hossein Khalili ; Marian Knight [Royaume-Uni] ; Koichiro Kudo ; Gabriela Kusznierz ; Ilija Kuzman ; Arthur M. C. Kwan ; Idriss L. Amine ; Eduard Langenegger ; Kamran B. Lankarani ; Yee-Sin Leo ; Rita Linko ; Pei Liu ; Faris Madanat ; Elga Mayo-Montero ; Allison Mcgeer ; Ziad Memish ; Gokhan Metan ; Auks Mickiene ; Dragan Miki ; Kristin G. I. Mohn ; Ahmadreza Moradi ; Pagbajabyn Nymadawa ; Maria E. Oliva ; Mehpare Ozkan ; Dhruv Parekh ; Mical Paul ; Fernando P. Polack ; Barbara A. Rath ; Alejandro H. Rodríguez ; Elena B. Sarrouf ; Anna C. Seale ; Bunyamin Sertogullarindan ; Marilda M. Siqueira ; Joanna Skr T-Magierło ; Frank Stephan ; Ewa Talarek ; Julian W. Tang ; Kelvin K. W. To ; Antoni Torres ; Selda H. Törün ; Dat Tran ; Timothy M. Uyeki ; Annelies Van Zwol ; Wendy Vaudry ; Tjasa Vidmar ; Renata T. C. Yokota ; Paul Zarogoulidis ; Jonathan S. Nguyen-Van-Tam

Source :

RBID : Hal:hal-01274568

Abstract

Background: Neuraminidase inhibitors were widely used during the 2009–10 influenza A H1N1 pandemic, but evidence for their effectiveness in reducing mortality is uncertain. We did a meta-analysis of individual participant data to investigate the association between use of neuraminidase inhibitors and mortality in patients admitted to hospital with pandemic influenza A H1N1pdm09 virus infection.Methods: We assembled data for patients (all ages) admitted to hospital worldwide with laboratory confirmed or clinically diagnosed pandemic influenza A H1N1pdm09 virus infection. We identified potential data contributors from an earlier systematic review of reported studies addressing the same research question. In our systematic review, eligible studies were done between March 1, 2009 (Mexico), or April 1, 2009 (rest of the world), until the WHO declaration of the end of the pandemic (Aug 10, 2010); however, we continued to receive data up to March 14, 2011, from ongoing studies. We did a meta-analysis of individual participant data to assess the association between neuraminidase inhibitor treatment and mortality (primary outcome), adjusting for both treatment propensity and potential confounders, using generalised linear mixed modelling. We assessed the association with time to treatment using time-dependent Cox regression shared frailty modelling.Findings: We included data for 29 234 patients from 78 studies of patients admitted to hospital between Jan 2, 2009, and March 14, 2011. Compared with no treatment, neuraminidase inhibitor treatment (irrespective of timing) was associated with a reduction in mortality risk (adjusted odds ratio [OR] 0·81; 95% CI 0·70–0·93; p=0·0024). Compared with later treatment, early treatment (within 2 days of symptom onset) was associated with a reduction in mortality risk (adjusted OR 0·48; 95% CI 0·41–0·56; p<0·0001). Early treatment versus no treatment was also associated with a reduction in mortality (adjusted OR 0·50; 95% CI 0·37–0·67; p<0·0001). These associations with reduced mortality risk were less pronounced and not significant in children. There was an increase in the mortality hazard rate with each day's delay in initiation of treatment up to day 5 as compared with treatment initiated within 2 days of symptom onset (adjusted hazard ratio [HR 1·23] [95% CI 1·18–1·28]; p<0·0001 for the increasing HR with each day's delay).Interpretation: We advocate early instigation of neuraminidase inhibitor treatment in adults admitted to hospital with suspected or proven influenza infection. Funding F Hoffmann-La Roche.


Url:
DOI: 10.1016/S2213-2600(14)70041-4

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<title xml:lang="en">Effectiveness of neuraminidase inhibitors in reducing mortality in patients admitted to hospital with influenza A H1N1pdm09 virus infection: an individual participant data meta-analysis</title>
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<name sortKey="Al Khuwaitir, Tarig S A" sort="Al Khuwaitir, Tarig S A" uniqKey="Al Khuwaitir T" first="Tarig S. A." last="Al Khuwaitir">Tarig S. A. Al Khuwaitir</name>
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<name sortKey="Miki, Dragan" sort="Miki, Dragan" uniqKey="Miki D" first="Dragan" last="Miki">Dragan Miki</name>
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<author>
<name sortKey="Rodriguez, Alejandro H" sort="Rodriguez, Alejandro H" uniqKey="Rodriguez A" first="Alejandro H." last="Rodríguez">Alejandro H. Rodríguez</name>
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<author>
<name sortKey="Sarrouf, Elena B" sort="Sarrouf, Elena B" uniqKey="Sarrouf E" first="Elena B." last="Sarrouf">Elena B. Sarrouf</name>
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<author>
<name sortKey="Seale, Anna C" sort="Seale, Anna C" uniqKey="Seale A" first="Anna C." last="Seale">Anna C. Seale</name>
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<name sortKey="Sertogullarindan, Bunyamin" sort="Sertogullarindan, Bunyamin" uniqKey="Sertogullarindan B" first="Bunyamin" last="Sertogullarindan">Bunyamin Sertogullarindan</name>
</author>
<author>
<name sortKey="Siqueira, Marilda M" sort="Siqueira, Marilda M" uniqKey="Siqueira M" first="Marilda M." last="Siqueira">Marilda M. Siqueira</name>
</author>
<author>
<name sortKey="Skr T Magierlo, Joanna" sort="Skr T Magierlo, Joanna" uniqKey="Skr T Magierlo J" first="Joanna" last="Skr T-Magierło">Joanna Skr T-Magierło</name>
</author>
<author>
<name sortKey="Stephan, Frank" sort="Stephan, Frank" uniqKey="Stephan F" first="Frank" last="Stephan">Frank Stephan</name>
</author>
<author>
<name sortKey="Talarek, Ewa" sort="Talarek, Ewa" uniqKey="Talarek E" first="Ewa" last="Talarek">Ewa Talarek</name>
</author>
<author>
<name sortKey="Tang, Julian W" sort="Tang, Julian W" uniqKey="Tang J" first="Julian W." last="Tang">Julian W. Tang</name>
</author>
<author>
<name sortKey="To, Kelvin K W" sort="To, Kelvin K W" uniqKey="To K" first="Kelvin K. W." last="To">Kelvin K. W. To</name>
</author>
<author>
<name sortKey="Torres, Antoni" sort="Torres, Antoni" uniqKey="Torres A" first="Antoni" last="Torres">Antoni Torres</name>
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<author>
<name sortKey="Torun, Selda H" sort="Torun, Selda H" uniqKey="Torun S" first="Selda H." last="Törün">Selda H. Törün</name>
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<author>
<name sortKey="Tran, Dat" sort="Tran, Dat" uniqKey="Tran D" first="Dat" last="Tran">Dat Tran</name>
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<author>
<name sortKey="Uyeki, Timothy M" sort="Uyeki, Timothy M" uniqKey="Uyeki T" first="Timothy M." last="Uyeki">Timothy M. Uyeki</name>
</author>
<author>
<name sortKey="Van Zwol, Annelies" sort="Van Zwol, Annelies" uniqKey="Van Zwol A" first="Annelies" last="Van Zwol">Annelies Van Zwol</name>
</author>
<author>
<name sortKey="Vaudry, Wendy" sort="Vaudry, Wendy" uniqKey="Vaudry W" first="Wendy" last="Vaudry">Wendy Vaudry</name>
</author>
<author>
<name sortKey="Vidmar, Tjasa" sort="Vidmar, Tjasa" uniqKey="Vidmar T" first="Tjasa" last="Vidmar">Tjasa Vidmar</name>
</author>
<author>
<name sortKey="Yokota, Renata T C" sort="Yokota, Renata T C" uniqKey="Yokota R" first="Renata T. C." last="Yokota">Renata T. C. Yokota</name>
</author>
<author>
<name sortKey="Zarogoulidis, Paul" sort="Zarogoulidis, Paul" uniqKey="Zarogoulidis P" first="Paul" last="Zarogoulidis">Paul Zarogoulidis</name>
</author>
<author>
<name sortKey="Nguyen Van Tam, Jonathan S" sort="Nguyen Van Tam, Jonathan S" uniqKey="Nguyen Van Tam J" first="Jonathan S." last="Nguyen-Van-Tam">Jonathan S. Nguyen-Van-Tam</name>
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</analytic>
<idno type="DOI">10.1016/S2213-2600(14)70041-4</idno>
<series>
<title level="j">Lancet Respiratory medicine</title>
<idno type="ISSN">2213-2600</idno>
<imprint>
<date type="datePub">2014</date>
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<front>
<div type="abstract" xml:lang="en">
<p>Background: Neuraminidase inhibitors were widely used during the 2009–10 influenza A H1N1 pandemic, but evidence for their effectiveness in reducing mortality is uncertain. We did a meta-analysis of individual participant data to investigate the association between use of neuraminidase inhibitors and mortality in patients admitted to hospital with pandemic influenza A H1N1pdm09 virus infection.Methods: We assembled data for patients (all ages) admitted to hospital worldwide with laboratory confirmed or clinically diagnosed pandemic influenza A H1N1pdm09 virus infection. We identified potential data contributors from an earlier systematic review of reported studies addressing the same research question. In our systematic review, eligible studies were done between March 1, 2009 (Mexico), or April 1, 2009 (rest of the world), until the WHO declaration of the end of the pandemic (Aug 10, 2010); however, we continued to receive data up to March 14, 2011, from ongoing studies. We did a meta-analysis of individual participant data to assess the association between neuraminidase inhibitor treatment and mortality (primary outcome), adjusting for both treatment propensity and potential confounders, using generalised linear mixed modelling. We assessed the association with time to treatment using time-dependent Cox regression shared frailty modelling.Findings: We included data for 29 234 patients from 78 studies of patients admitted to hospital between Jan 2, 2009, and March 14, 2011. Compared with no treatment, neuraminidase inhibitor treatment (irrespective of timing) was associated with a reduction in mortality risk (adjusted odds ratio [OR] 0·81; 95% CI 0·70–0·93; p=0·0024). Compared with later treatment, early treatment (within 2 days of symptom onset) was associated with a reduction in mortality risk (adjusted OR 0·48; 95% CI 0·41–0·56; p<0·0001). Early treatment versus no treatment was also associated with a reduction in mortality (adjusted OR 0·50; 95% CI 0·37–0·67; p<0·0001). These associations with reduced mortality risk were less pronounced and not significant in children. There was an increase in the mortality hazard rate with each day's delay in initiation of treatment up to day 5 as compared with treatment initiated within 2 days of symptom onset (adjusted hazard ratio [HR 1·23] [95% CI 1·18–1·28]; p<0·0001 for the increasing HR with each day's delay).Interpretation: We advocate early instigation of neuraminidase inhibitor treatment in adults admitted to hospital with suspected or proven influenza infection. Funding F Hoffmann-La Roche.</p>
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<title xml:lang="en">Effectiveness of neuraminidase inhibitors in reducing mortality in patients admitted to hospital with influenza A H1N1pdm09 virus infection: an individual participant data meta-analysis</title>
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<title xml:lang="en">Effectiveness of neuraminidase inhibitors in reducing mortality in patients admitted to hospital with influenza A H1N1pdm09 virus infection: an individual participant data meta-analysis</title>
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<forename type="first">Anjarath L. H.</forename>
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<forename type="first">Peter H.</forename>
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<persName>
<forename type="first">Xiaoyun</forename>
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</author>
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<persName>
<forename type="first">Quazi T.</forename>
<surname>Islam</surname>
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<idno type="halauthorid">1294287</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Mirela F.</forename>
<surname>Jiménez</surname>
</persName>
<idno type="halauthorid">1294288</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Amr</forename>
<surname>Kandeel</surname>
</persName>
<idno type="halauthorid">862200</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Gerben</forename>
<surname>Keijzers</surname>
</persName>
<idno type="halauthorid">1294289</idno>
</author>
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<persName>
<forename type="first">Hossein</forename>
<surname>Khalili</surname>
</persName>
<idno type="halauthorid">1294290</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Marian</forename>
<surname>Knight</surname>
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<email type="domain">npeu.ox.ac.uk</email>
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<forename type="first">Koichiro</forename>
<surname>Kudo</surname>
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<idno type="halauthorid">1294291</idno>
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<persName>
<forename type="first">Gabriela</forename>
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<idno type="halauthorid">1294292</idno>
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<persName>
<forename type="first">Ilija</forename>
<surname>Kuzman</surname>
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</author>
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<persName>
<forename type="first">Arthur M. C.</forename>
<surname>Kwan</surname>
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<idno type="halauthorid">1294294</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Idriss L.</forename>
<surname>Amine</surname>
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<idno type="halauthorid">1294295</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Eduard</forename>
<surname>Langenegger</surname>
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<idno type="halauthorid">1294296</idno>
</author>
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<persName>
<forename type="first">Kamran B.</forename>
<surname>Lankarani</surname>
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<idno type="halauthorid">1294297</idno>
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<author role="aut">
<persName>
<forename type="first">Yee-Sin</forename>
<surname>Leo</surname>
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<idno type="halauthorid">1294298</idno>
</author>
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<persName>
<forename type="first">Rita</forename>
<surname>Linko</surname>
</persName>
<idno type="halauthorid">1294299</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Pei</forename>
<surname>Liu</surname>
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<idno type="halauthorid">1019228</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Faris</forename>
<surname>Madanat</surname>
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<idno type="halauthorid">1294300</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Elga</forename>
<surname>Mayo-Montero</surname>
</persName>
<idno type="halauthorid">1294301</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Allison</forename>
<surname>McGeer</surname>
</persName>
<idno type="halauthorid">1294302</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Ziad</forename>
<surname>Memish</surname>
</persName>
<idno type="halauthorid">1294303</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Gokhan</forename>
<surname>Metan</surname>
</persName>
<idno type="halauthorid">1206065</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Auksė</forename>
<surname>Mickiene</surname>
</persName>
<idno type="halauthorid">1294304</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Dragan</forename>
<surname>Mikić</surname>
</persName>
<idno type="halauthorid">1294305</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Kristin G. I.</forename>
<surname>Mohn</surname>
</persName>
<idno type="halauthorid">1294306</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Ahmadreza</forename>
<surname>Moradi</surname>
</persName>
<idno type="halauthorid">1294307</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Pagbajabyn</forename>
<surname>Nymadawa</surname>
</persName>
<idno type="halauthorid">1294308</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Maria E.</forename>
<surname>Oliva</surname>
</persName>
<idno type="halauthorid">1294309</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Mehpare</forename>
<surname>Ozkan</surname>
</persName>
<idno type="halauthorid">1294310</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Dhruv</forename>
<surname>Parekh</surname>
</persName>
<idno type="halauthorid">1294311</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Mical</forename>
<surname>Paul</surname>
</persName>
<idno type="halauthorid">1294312</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Fernando P.</forename>
<surname>Polack</surname>
</persName>
<idno type="halauthorid">1294313</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Barbara A.</forename>
<surname>Rath</surname>
</persName>
<idno type="halauthorid">1294314</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Alejandro H.</forename>
<surname>Rodríguez</surname>
</persName>
<idno type="halauthorid">1294315</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Elena B.</forename>
<surname>Sarrouf</surname>
</persName>
<idno type="halauthorid">1294316</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Anna C.</forename>
<surname>Seale</surname>
</persName>
<idno type="halauthorid">1294317</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Bunyamin</forename>
<surname>Sertogullarindan</surname>
</persName>
<idno type="halauthorid">1294318</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Marilda M.</forename>
<surname>Siqueira</surname>
</persName>
<idno type="halauthorid">1294319</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Joanna</forename>
<surname>Skręt-Magierło</surname>
</persName>
<idno type="halauthorid">1294320</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Frank</forename>
<surname>Stephan</surname>
</persName>
<email type="md5">b57e441adb78cb40ab6bd765cb9398f2</email>
<email type="domain">comp.nus.edu.sg</email>
<idno type="halauthorid">230241</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Ewa</forename>
<surname>Talarek</surname>
</persName>
<idno type="halauthorid">1294321</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Julian W.</forename>
<surname>Tang</surname>
</persName>
<idno type="halauthorid">1294322</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Kelvin K. W.</forename>
<surname>To</surname>
</persName>
<idno type="halauthorid">1294323</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Antoni</forename>
<surname>Torres</surname>
</persName>
<idno type="halauthorid">1294324</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Selda H.</forename>
<surname>Törün</surname>
</persName>
<idno type="halauthorid">1294325</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Dat</forename>
<surname>Tran</surname>
</persName>
<idno type="halauthorid">1294326</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Timothy M.</forename>
<surname>Uyeki</surname>
</persName>
<idno type="halauthorid">1294327</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Annelies</forename>
<surname>Van Zwol</surname>
</persName>
<idno type="halauthorid">1294328</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Wendy</forename>
<surname>Vaudry</surname>
</persName>
<idno type="halauthorid">1294329</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Tjasa</forename>
<surname>Vidmar</surname>
</persName>
<idno type="halauthorid">1294330</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Renata T. C.</forename>
<surname>Yokota</surname>
</persName>
<idno type="halauthorid">1294331</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Paul</forename>
<surname>Zarogoulidis</surname>
</persName>
<idno type="halauthorid">1294332</idno>
</author>
<author role="aut">
<persName>
<forename type="first">Jonathan S.</forename>
<surname>Nguyen-Van-Tam</surname>
</persName>
<idno type="halauthorid">1294333</idno>
</author>
</analytic>
<monogr>
<idno type="halJournalId" status="VALID">113394</idno>
<idno type="issn">2213-2600</idno>
<idno type="eissn">2213-2619</idno>
<title level="j">Lancet Respiratory medicine</title>
<imprint>
<publisher>Elsevier</publisher>
<biblScope unit="volume">2</biblScope>
<biblScope unit="issue">5</biblScope>
<biblScope unit="pp">395-404</biblScope>
<date type="datePub">2014</date>
<date type="dateEpub">2014-03-19</date>
</imprint>
</monogr>
<idno type="doi">10.1016/S2213-2600(14)70041-4</idno>
<ref type="seeAlso" target="http://www.sciencedirect.com/science/article/pii/S2213260014700414">http://www.sciencedirect.com/science/article/pii/S2213260014700414</ref>
</biblStruct>
</sourceDesc>
<profileDesc>
<langUsage>
<language ident="en">English</language>
</langUsage>
<textClass>
<classCode scheme="halDomain" n="sdv.sp.pharma">Life Sciences [q-bio]/Pharmaceutical sciences/Pharmacology</classCode>
<classCode scheme="halDomain" n="sdv.mhep.mi">Life Sciences [q-bio]/Human health and pathology/Infectious diseases</classCode>
<classCode scheme="halDomain" n="sdv.mhep.me">Life Sciences [q-bio]/Human health and pathology/Emerging diseases</classCode>
<classCode scheme="halTypology" n="ART">Journal articles</classCode>
</textClass>
<abstract xml:lang="en">
<p>Background: Neuraminidase inhibitors were widely used during the 2009–10 influenza A H1N1 pandemic, but evidence for their effectiveness in reducing mortality is uncertain. We did a meta-analysis of individual participant data to investigate the association between use of neuraminidase inhibitors and mortality in patients admitted to hospital with pandemic influenza A H1N1pdm09 virus infection.Methods: We assembled data for patients (all ages) admitted to hospital worldwide with laboratory confirmed or clinically diagnosed pandemic influenza A H1N1pdm09 virus infection. We identified potential data contributors from an earlier systematic review of reported studies addressing the same research question. In our systematic review, eligible studies were done between March 1, 2009 (Mexico), or April 1, 2009 (rest of the world), until the WHO declaration of the end of the pandemic (Aug 10, 2010); however, we continued to receive data up to March 14, 2011, from ongoing studies. We did a meta-analysis of individual participant data to assess the association between neuraminidase inhibitor treatment and mortality (primary outcome), adjusting for both treatment propensity and potential confounders, using generalised linear mixed modelling. We assessed the association with time to treatment using time-dependent Cox regression shared frailty modelling.Findings: We included data for 29 234 patients from 78 studies of patients admitted to hospital between Jan 2, 2009, and March 14, 2011. Compared with no treatment, neuraminidase inhibitor treatment (irrespective of timing) was associated with a reduction in mortality risk (adjusted odds ratio [OR] 0·81; 95% CI 0·70–0·93; p=0·0024). Compared with later treatment, early treatment (within 2 days of symptom onset) was associated with a reduction in mortality risk (adjusted OR 0·48; 95% CI 0·41–0·56; p<0·0001). Early treatment versus no treatment was also associated with a reduction in mortality (adjusted OR 0·50; 95% CI 0·37–0·67; p<0·0001). These associations with reduced mortality risk were less pronounced and not significant in children. There was an increase in the mortality hazard rate with each day's delay in initiation of treatment up to day 5 as compared with treatment initiated within 2 days of symptom onset (adjusted hazard ratio [HR 1·23] [95% CI 1·18–1·28]; p<0·0001 for the increasing HR with each day's delay).Interpretation: We advocate early instigation of neuraminidase inhibitor treatment in adults admitted to hospital with suspected or proven influenza infection. Funding F Hoffmann-La Roche.</p>
</abstract>
</profileDesc>
</hal>
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