Abstract
Purpose
Noninvasive continuous positive airway pressure (n-CPAP) has been proposed for the treatment of hypoxemic acute respiratory failure (h-ARF). Recruitment maneuvers were shown to improve oxygenation, i.e., the ratio of arterial oxygen tension to inspiratory oxygen fraction (PaO2/FiO2), during either invasive mechanical ventilation, and n-CPAP, with a response depending on the distribution of lung collapse. We hypothesized that, during n-CPAP, early h-ARF patients with bilateral (BL) distribution of lung involvement would benefit from recruitment maneuvers more than those with unilateral (UL) involvement.
Methods
To perform a recruitment maneuver, once a minute we increased the pressure applied to the airway from 10 cmH2O to 25 cmH2O for 8 s (SIGH). We enrolled 24 patients with h-ARF (12 BL and 12 UL) who underwent four consecutive trials: (1) 30 min breathing through a Venturi mask (VMASK), (2) 1 h n-CPAP (n-CPAP1), (3) 1 h n-CPAP plus SIGH (n-CPAPSIGH), and (4) 1 h n-CPAP (n-CPAP2).
Results
Compared to VMASK, n-CPAP at 10 cmH2O delivered via a helmet, increased PaO2/FiO2 and decreased dyspnea in both BL and UL; furthermore, it reduced the respiratory rate and brought PaCO2 up to normal in BL only. Compared to n-CPAP, n-CPAPSIGH significantly improved PaO2/FiO2 in BL (225 ± 88 vs. 308 ± 105, respectively), whereas it produced no further improvement in PaO2/FiO2 in UL (232 ± 72 vs. 231 ± 77, respectively). SIGH did not affect hemodynamics in both groups.
Conclusions
Compared to n-CPAP, n-CPAPSIGH further improved arterial oxygenation in BL patients, whereas it produced no additional benefit in those with UL.
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Acknowledgments
We are grateful to all the physicians and nurses of the Intensive Care Unit of the Maggiore della Carità Hospital, Novara, Italy, without whose help and dedication this work could not have been possible. This work has not been funded by any external source. TwinPAP® was kindly provided by StarMed, Mirandola, Modena, Italy. The preliminary results of this study were presented at the 2009 meeting of the European Society of Intensive Care Medicine, Vienna.
Conflict of interest
GC, RV, ET, FD, DC, CB, FDC, and SMM have no conflicts of interest to disclose. PN is contributing to the development of a new interface whose license for patent belongs to Starmed S.p.A.
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G. Cammarota and R. Vaschetto equally contributed.
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Cammarota, G., Vaschetto, R., Turucz, E. et al. Influence of lung collapse distribution on the physiologic response to recruitment maneuvers during noninvasive continuous positive airway pressure. Intensive Care Med 37, 1095–1102 (2011). https://doi.org/10.1007/s00134-011-2239-8
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DOI: https://doi.org/10.1007/s00134-011-2239-8