Impact of neuraminidase inhibitors on influenza A(H1N1)pdm09-related pneumonia: an individual participant data meta-analysis.
Muthuri SG., Venkatesan S., Myles PR., Leonardi-Bee J., Lim WS., Al Mamun A., Anovadiya AP., Araújo WN., Azziz-Baumgartner E., Báez C., Bantar C., Barhoush MM., Bassetti M., Beovic B., Bingisser R., Bonmarin I., Borja-Aburto VH., Cao B., Carratala J., Cuezzo MR., Denholm JT., Dominguez SR., Duarte PA., Dubnov-Raz G., Echavarria M., Fanella S., Fraser J., Gao Z., Gérardin P., Giannella M., Gubbels S., Herberg J., Higuera Iglesias AL., Hoeger PH., Hoffmann M., Hu X., Islam QT., Jiménez MF., Kandeel A., Keijzers G., Khalili H., Khandaker G., Knight M., Kusznierz G., Kuzman I., Kwan AM., Lahlou Amine I., Langenegger E., Lankarani KB., Leo YS., Linko R., Liu P., Madanat F., Manabe T., Mayo-Montero E., McGeer A., Memish ZA., Metan G., Mikić D., Mohn KG., Moradi A., Nymadawa P., Ozbay B., Ozkan M., Parekh D., Paul M., Poeppl W., Polack FP., Rath BA., Rodríguez AH., Siqueira MM., Skręt-Magierło J., Talarek E., Tang JW., Torres A., Törün SH., Tran D., Uyeki TM., van Zwol A., Vaudry W., Velyvyte D., Vidmar T., Zarogoulidis P., PRIDE Consortium Investigators None., Nguyen-Van-Tam JS.
BACKGROUND: The impact of neuraminidase inhibitors (NAIs) on influenza-related pneumonia (IRP) is not established. Our objective was to investigate the association between NAI treatment and IRP incidence and outcomes in patients hospitalised with A(H1N1)pdm09 virus infection. METHODS: A worldwide meta-analysis of individual participant data from 20 634 hospitalised patients with laboratory-confirmed A(H1N1)pdm09 (n = 20 021) or clinically diagnosed (n = 613) 'pandemic influenza'. The primary outcome was radiologically confirmed IRP. Odds ratios (OR) were estimated using generalised linear mixed modelling, adjusting for NAI treatment propensity, antibiotics and corticosteroids. RESULTS: Of 20 634 included participants, 5978 (29·0%) had IRP; conversely, 3349 (16·2%) had confirmed the absence of radiographic pneumonia (the comparator). Early NAI treatment (within 2 days of symptom onset) versus no NAI was not significantly associated with IRP [adj. OR 0·83 (95% CI 0·64-1·06; P = 0·136)]. Among the 5978 patients with IRP, early NAI treatment versus none did not impact on mortality [adj. OR = 0·72 (0·44-1·17; P = 0·180)] or likelihood of requiring ventilatory support [adj. OR = 1·17 (0·71-1·92; P = 0·537)], but early treatment versus later significantly reduced mortality [adj. OR = 0·70 (0·55-0·88; P = 0·003)] and likelihood of requiring ventilatory support [adj. OR = 0·68 (0·54-0·85; P = 0·001)]. CONCLUSIONS: Early NAI treatment of patients hospitalised with A(H1N1)pdm09 virus infection versus no treatment did not reduce the likelihood of IRP. However, in patients who developed IRP, early NAI treatment versus later reduced the likelihood of mortality and needing ventilatory support.