High efficiency particulate air filters and heat & moisture exchanger filters increase positive end-expiratory pressure in helmet continuous positive airway pressure: A bench-top study E. Rezoagli, G. Coppola, L. Dezza, A. Galesi, G.P. Gallo, R. Fumagalli, G. Bellani, G. Foti, A. Lucchini

Helmet continuous positive airway pressure and prone positioning: A proposal for an early management of COVID-19 patients F. Longhini, A. Bruni, E. Garofalo, P. Navalesi, G. Grasselli, R. Cosentini, G. Foti, A. Mattei, M. Ippolito, G. Accurso, F. Vitale, A. Cortegiani, C. Gregoretti

Predictors of intubation in COVID-19 patients treated with out-of-ICU continuous positive airway pressure N. De Vita, L. Scotti, G. Cammarota, F. Racca, C. Pissaia, C. Maestrone, D. Colombo, C. Olivieri, F. Della Corte, F. Barone-Adesi, P. Navalesi, R. Vaschetto