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Ball, Lorenzo; Robba, Chiara; Maiello, Lorenzo; Herrmann, Jacob; Gerard, Sarah E; Xin, Yi; Battaglini, Denise; Brunetti, Iole; Minetti, Giuseppe; Seitun, Sara; Vena, Antonio; Giacobbe, Daniele Roberto; Bassetti, Matteo; Rocco, Patricia R M; Cereda, Maurizio; Castellan, Lucio; Patroniti, Nicolò; Pelosi, Paolo
Critical care (London, England), 02/2021, Volume: 25, Issue: 1Journal Article
There is a paucity of data concerning the optimal ventilator management in patients with COVID-19 pneumonia; particularly, the optimal levels of positive-end expiratory pressure (PEEP) are unknown. We aimed to investigate the effects of two levels of PEEP on alveolar recruitment in critically ill patients with severe COVID-19 pneumonia. A single-center cohort study was conducted in a 39-bed intensive care unit at a university-affiliated hospital in Genoa, Italy. Chest computed tomography (CT) was performed to quantify aeration at 8 and 16 cmH O PEEP. The primary endpoint was the amount of alveolar recruitment, defined as the change in the non-aerated compartment at the two PEEP levels on CT scan. Forty-two patients were included in this analysis. Alveolar recruitment was median interquartile range 2.7 0.7-4.5 % of lung weight and was not associated with excess lung weight, PaO /FiO ratio, respiratory system compliance, inflammatory and thrombophilia markers. Patients in the upper quartile of recruitment (recruiters), compared to non-recruiters, had comparable clinical characteristics, lung weight and gas volume. Alveolar recruitment was not different in patients with lower versus higher respiratory system compliance. In a subgroup of 20 patients with available gas exchange data, increasing PEEP decreased respiratory system compliance (median difference, MD - 9 ml/cmH O, 95% CI from - 12 to - 6 ml/cmH O, p < 0.001) and the ventilatory ratio (MD - 0.1, 95% CI from - 0.3 to - 0.1, p = 0.003), increased PaO with FiO = 0.5 (MD 24 mmHg, 95% CI from 12 to 51 mmHg, p < 0.001), but did not change PaO with FiO = 1.0 (MD 7 mmHg, 95% CI from - 12 to 49 mmHg, p = 0.313). Moreover, alveolar recruitment was not correlated with improvement of oxygenation or venous admixture. In patients with severe COVID-19 pneumonia, higher PEEP resulted in limited alveolar recruitment. These findings suggest limiting PEEP strictly to the values necessary to maintain oxygenation, thus avoiding the use of higher PEEP levels.
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