The Use of the Oxygenation Stretch Index to Predict Outcomes in Mechanically Ventilated PatientsWith COVID-19 ARDS
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Tipo de produção
article
Data de publicação
2023
Título da Revista
ISSN da Revista
Título do Volume
Editora
DAEDALUS ENTERPRISES INC
Autores
ROLDAN, Rollin
BARRIGA, Fernando
VILLAMONTE, Renan
ROMANI, Franco
GONZALES, Arturo
WONG, Paolo
ZAGACETA, Jorge
BROCHARD, Laurent
Citação
RESPIRATORY CARE, v.68, n.12, p.1683-1692, 2023
Resumo
BACKGROUND: In ARDS caused by COVID-19 pneumonia, appropriate adjustment of physiologic parameters based on lung stretch or oxygenation may optimize the ventilatory strategy. This study aims to describe the prognostic performance on 60-d mortality of single and composite respiratory variables in subjects with COVID- 19 ARDS who are on mechanical ventilation with a lung-protective strategy, including the oxygenation stretch index combining oxygenation and driving pressure (Delta P). METHODS: This single-center observational cohort study enrolled 166 subjects on mechanical ventilation and diagnosed with COVID-19 ARDS. We evaluated their clinical and physiologic characteristics. The primary study outcome was 60-d mortality. Prognostic factors were evaluated through receiver operating characteristic analysis, Cox proportional hazards regression model, and Kaplan-Meier survival curves. RESULTS: Mortality at day 60 was 18.1%, and hospital mortality was 22.9%. Oxygenation, DP, and composite variables were tested: oxygenation stretch index (P-aO2 /F-IO2 divided by Delta P) and Delta P 3 4 + breathing frequency (f) (Delta P 3 4 + f). At both day 1 and day 2 after inclusion, the oxygenation stretch index had the best area under the receiver operating characteristic curve (oxygenation stretch index on day 1 0.76 (95% CI 0.67-0.84) and on day 2 0.83 (95% CI 0.76-0.91) to predict 60-d mortality, although without significant difference from other indexes. In multivariable Cox regression, Delta P, PaO2 /FIO2, Delta P 3 4 + f, and oxygenation stretch index were all associated with 60-d mortality. When dichotomizing the variables, Delta P >= 14, P-aO2 / F-IO2 >= 152 mm Hg, Delta P x 4 + f >= 80, and oxygenation stretch index < 7.7 showed lower 60-d survival probability. At day 2, after optimization of ventilatory settings, the subjects who persisted with the worse cutoff values for the oxygenation stretch index showed a lower probability of survival at 60 d compared with day 1; this was not the case for other parameters. CONCLUSIONS: The oxygenation stretch index, which combines P-aO2 /F-IO2 and DP, is associated with mortality and may be useful to predict clinical outcomes in COVID-19 ARDS.
Palavras-chave
COVID-19, acute respiratory distress syndrome, outcome, assessment, prognostic
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