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Annals of Intensive Care
Published in: Annals of Intensive Care 1/2019

Open Access 01-12-2019 | Acute Respiratory Distress-Syndrome | Research

Estimated dead space fraction and the ventilatory ratio are associated with mortality in early ARDS

Authors: Luis Morales-Quinteros, Marcus J. Schultz, Josep Bringué, Carolyn S. Calfee, Marta Camprubí, Olaf L. Cremer, Janneke Horn, Tom van der Poll, Pratik Sinha, Antonio Artigas, Lieuwe D. Bos, MARS Consortium

Published in: Annals of Intensive Care | Issue 1/2019

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Abstract

Background

Indirect indices for measuring impaired ventilation, such as the estimated dead space fraction and the ventilatory ratio, have been shown to be independently associated with an increased risk of mortality. This study aimed to compare various methods for dead space estimation and the ventilatory ratio in patients with acute respiratory distress syndrome (ARDS) and to determine their independent values for predicting death at day 30. The present study is a post hoc analysis of a prospective observational cohort study of ICUs of two tertiary care hospitals in the Netherlands.

Results

Individual patient data from 940 ARDS patients were analyzed. Estimated dead space fraction and the ventilatory ratio at days 1 and 2 were significantly higher among non-survivors (p < 0.01). Dead space fraction calculation using the estimate from physiological variables [VD/VT phys] and the ventilatory ratio at day 2 showed independent association with mortality at 30 days (odds ratio 1.28 [95% CI 1.02–1.61], p < 0.03 and 1.20 [95% CI, 1.01–1.40], p < 0.03, respectively); whereas, the Harris–Benedict [VD/VT HB] and Penn State [VD/VT PS] estimations were not associated with mortality. The predicted validity of the estimated dead space fraction and the ventilatory ratio improved the baseline model based on PEEP, PaO2/FiO2, driving pressure and compliance of the respiratory system at day 2 (AUROCC 0.72 vs. 0.69, p < 0.05).

Conclusions

Estimated methods for dead space calculation and the ventilatory ratio during the early course of ARDS are associated with mortality at day 30 and add statistically significant but limited improvement in the predictive accuracy to indices of oxygenation and respiratory system mechanics at the second day of mechanical ventilation.
Appendix
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Metadata
Title
Estimated dead space fraction and the ventilatory ratio are associated with mortality in early ARDS
Authors
Luis Morales-Quinteros
Marcus J. Schultz
Josep Bringué
Carolyn S. Calfee
Marta Camprubí
Olaf L. Cremer
Janneke Horn
Tom van der Poll
Pratik Sinha
Antonio Artigas
Lieuwe D. Bos
MARS Consortium
Publication date
01-12-2019
Publisher
Springer International Publishing
Published in
Annals of Intensive Care / Issue 1/2019
Electronic ISSN: 2110-5820
DOI
https://doi.org/10.1186/s13613-019-0601-0

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