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Effects of Prone Positioning on Respiratory Mechanics and Oxygenation in Critically Ill Patients With COVID-19 Requiring Venovenous Extracorporeal Membrane Oxygenation

Overview
Specialty General Medicine
Date 2022 Feb 3
PMID 35111786
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Abstract

Background: The effect of prone positioning (PP) on respiratory mechanics remains uncertain in patients with severe acute respiratory distress syndrome (ARDS) requiring venovenous extracorporeal membrane oxygenation (VV-ECMO).

Methods: We prospectively analyzed the effects of PP on respiratory mechanics from continuous data with over a thousand time points during 16-h PP sessions in patients with COVID-19 and ARDS under VV-ECMO conditions. The evolution of respiratory mechanical and oxygenation parameters during the PP sessions was evaluated by dividing each PP session into four time quartiles: first quartile: 0-4 h, second quartile: 4-8 h, third quartile: 8-12 h, and fourth quartile: 12-16 h.

Results: Overall, 38 PP sessions were performed in 10 patients, with 3 [2-5] PP sessions per patient. Seven (70%) patients were responders to at least one PP session. PP significantly increased the PaO/FiO ratio by 14 ± 21% and compliance by 8 ± 15%, and significantly decreased the oxygenation index by 13 ± 18% and driving pressure by 8 ± 12%. The effects of PP on respiratory mechanics but not on oxygenation persisted after supine repositioning. PP-induced changes in different respiratory mechanical parameters and oxygenation started as early as the first-time quartile, without any difference in PP-induced changes among the different time quartiles. PP-induced changes in driving pressure (-14 ± 14 vs. -6 ± 10%, = 0.04) and mechanical power (-11 ± 13 vs. -0.1 ± 12%, = 0.02) were significantly higher in responders (increase in PaO/FiO ratio > 20%) than in non-responder patients.

Conclusions: In patients with COVID-19 and severe ARDS, PP under VV-ECMO conditions improved the respiratory mechanical and oxygenation parameters, and the effects of PP on respiratory mechanics persisted after supine repositioning.

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