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Minerva Anestesiologica 2012 December;78(12):1333-40


language: English

Effectiveness and predictors of success of noninvasive ventilation during H1N1 pandemics: a multicenter study

Nicolini A. 1, Tonveronachi E. 2, Navalesi P. 3, Antonelli M. 4, Valentini I. 2, Melotti R. M. 5, Pigna A. 5, Carrassi A. 6, Righini P. 7, Ferrari Bravo M. 8, Pelosi P. 9, Nicoli F. 10, Cosentini R. 10, Vaschetto R. 3, Faenza S. 11, Nava S. 2

1 Respiratory Diseases Unit, Hospital of Sestri Levante, Sestri Levante, Genoa, Italy: 2 Respiratory and Critical Care Unit, Sant’Orsola Malpighi Hospital, Bologna, Italy; 3 ICU Ospedale della Carità, Università del Piemonte Orientale, Novara, Italy; 4 ICU Policlinico Universitario Gemelli, Rome, Italy; 5 Dipartimento di Chirurgie Specialistiche e Anestesiologia, U.O. di Anestesiologia e Terapia Intensiva Polivalente, Sant’Orsola Malpighi Hospital, Bologna, Italy; 6 Department of Respiratory Diseases, San Paolo Hospital, Bari, Italy; 7 Department of Respiratory Diseases, Mauriziano Hospital, Turin, Italy; 8 Public Health Unit, Chiavari, Genoa, Italy; 9 ICU San Martino Hospital, Università degli Studi, Genoa, Italy; 10 Emergency Medicine Department, Fondazione IRCCS Ca’ Granda, Ospedale Maggiore Policlinico, Milan, Italy; 11 Dipartimento di Anestesiologia e Rianimazione, Sant’Orsola Malpighi Hospital, Bologna, Italy


BACKGROUND: The use of non-invasive ventilation (NIV) in acute hypoxemic respiratory failure (AHRF) due to H1N1 virus infection is controversial. In this multicenter study we aimed to assess the efficacy of NIV in avoiding endotracheal intubation (ETI) and to identify predictors of success or failure.
METHODS: In this prospective multicenter study, 98 patients with new pulmonary infiltrate(s) sustained by H1N1 virus and a PaO2/FiO2<300 were eligible for study; 38/98 required immediate ETI, while the others received NIV as a first line therapy; 13/60 patients failed NIV and were intubated after 5.8+5.5 hours from enrolment. The remaining 47/60 patients were successfully ventilated with NIV.
RESULTS: Hospital mortality was significantly higher in those patients who failed NIV vs. those who succeeded (53.8% vs. 2.1%; OR=0.52, P<0.001). ETI was associated with higher number of infectious complications, mainly sepsis and septic shock. The OR of having one of these events in the NIV failure group vs. NIV success was 16.7, P<0.001. According to logistic regression model, a SAPS II>29 and a PaO2/FIO2≤127 at admission and PaO2/FIO2≤149 after 1 hr of NIV were independently associated with the need for ETI.
CONCLUSION: The early application of NIV, with the aim to avoid invasive ventilation, during the H1N1 pandemics was associated with an overall success rate of 47/98 (48%). Patients presenting at admission with an high SAPS II score and a low PaO2/FiO2 ratio and/or unable to promptly correct gas exchange are at high risk of intubation and mortality.

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