Impaired Ventilation Is Not Independently Associated With 28-day Mortality in COVID-19 ARDS
Background: Surrogates for impaired ventilation such as estimated dead-space fractions and the ventilatory ratio have been shown to be independently associated with an increased risk of mortality in the acute respiratory distress syndrome and small case series of COVID-19 related ARDS.
Methods: Secondary analysis from the PRoVENT-COVID study. The PRoVENT-COVID is a national, multicentre, retrospective observational study done at 22 intensive care units in the Netherlands. Consecutive patients aged at least 18 years were eligible for participation if they had received invasive ventilation for COVID-19 at a participating ICU during the first month of the national outbreak in the Netherlands. The aim was to quantify the dynamics and determine the prognostic value of surrogate markers of impaired ventilation patients with COVID-19 related ARDS.
Results: 927 consecutive patients admitted with COVID-19 related ARDS were included in this study. Surrogates of impaired ventilation such as the estimated dead space fraction (by Harris-Benedict and direct method) and ventilatory ratio were significantly higher in non-survivors than survivors at baseline and during the following days of mechanical ventilation (p <0.001). The end-tidal-to-arterial PCO2 ratio was lower in non-survivors than in survivors (p<0.001). As ARDS severity increased, mortality increased with successive tertiles of dead space fraction by Harris-Benedict and by direct estimation, and for the VR. The same trend was observed with decreased levels in the tertiles for the end-tidal-to-arterial PCO2 ratio. After adjustment for a base risk model that included chronic comorbidities and ventilation- and oxygenation-parameters, none of the surrogates of impaired ventilation measured at the start of ventilation or the following days were significantly associated with 28-day mortality.
Conclusions: There is significant impairment of ventilation in the early course of COVID-19 related ARDS but quantification of this impairment does not add prognostic information when added to a baseline risk-model.
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Title: Impaired ventilation is not associated with 28-day mortality in COVID-19 ARDS Description of data: methods, tables and figure
Posted 21 Jan, 2021
On 25 Feb, 2021
Received 23 Feb, 2021
Received 16 Feb, 2021
On 06 Feb, 2021
Received 04 Feb, 2021
Received 03 Feb, 2021
On 31 Jan, 2021
On 31 Jan, 2021
On 27 Jan, 2021
Invitations sent on 26 Jan, 2021
On 25 Jan, 2021
On 25 Jan, 2021
On 19 Jan, 2021
On 17 Jan, 2021
Impaired Ventilation Is Not Independently Associated With 28-day Mortality in COVID-19 ARDS
Posted 21 Jan, 2021
On 25 Feb, 2021
Received 23 Feb, 2021
Received 16 Feb, 2021
On 06 Feb, 2021
Received 04 Feb, 2021
Received 03 Feb, 2021
On 31 Jan, 2021
On 31 Jan, 2021
On 27 Jan, 2021
Invitations sent on 26 Jan, 2021
On 25 Jan, 2021
On 25 Jan, 2021
On 19 Jan, 2021
On 17 Jan, 2021
Background: Surrogates for impaired ventilation such as estimated dead-space fractions and the ventilatory ratio have been shown to be independently associated with an increased risk of mortality in the acute respiratory distress syndrome and small case series of COVID-19 related ARDS.
Methods: Secondary analysis from the PRoVENT-COVID study. The PRoVENT-COVID is a national, multicentre, retrospective observational study done at 22 intensive care units in the Netherlands. Consecutive patients aged at least 18 years were eligible for participation if they had received invasive ventilation for COVID-19 at a participating ICU during the first month of the national outbreak in the Netherlands. The aim was to quantify the dynamics and determine the prognostic value of surrogate markers of impaired ventilation patients with COVID-19 related ARDS.
Results: 927 consecutive patients admitted with COVID-19 related ARDS were included in this study. Surrogates of impaired ventilation such as the estimated dead space fraction (by Harris-Benedict and direct method) and ventilatory ratio were significantly higher in non-survivors than survivors at baseline and during the following days of mechanical ventilation (p <0.001). The end-tidal-to-arterial PCO2 ratio was lower in non-survivors than in survivors (p<0.001). As ARDS severity increased, mortality increased with successive tertiles of dead space fraction by Harris-Benedict and by direct estimation, and for the VR. The same trend was observed with decreased levels in the tertiles for the end-tidal-to-arterial PCO2 ratio. After adjustment for a base risk model that included chronic comorbidities and ventilation- and oxygenation-parameters, none of the surrogates of impaired ventilation measured at the start of ventilation or the following days were significantly associated with 28-day mortality.
Conclusions: There is significant impairment of ventilation in the early course of COVID-19 related ARDS but quantification of this impairment does not add prognostic information when added to a baseline risk-model.
Figure 1
Figure 2
Figure 3
Figure 4
Due to technical limitations, full-text HTML conversion of this manuscript could not be completed. However, the manuscript can be downloaded and accessed as a PDF.
Due to technical limitations, tables docx is only available as a download in the Supplemental Files section.