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Microcirculatory dysfunction and dead-space ventilation in early ARDS: a hypothesis-generating observational study

BACKGROUND: Ventilation/perfusion inequalities impair gas exchange in acute respiratory distress syndrome (ARDS). Although increased dead-space ventilation (V(D)/V(T)) has been described in ARDS, its mechanism is not clearly understood. We sought to evaluate the relationships between dynamic variati...

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Autores principales: Ospina-Tascón, Gustavo A., Bautista, Diego F., Madriñán, Humberto J., Valencia, Juan D., Bermúdez, William F., Quiñones, Edgardo, Calderón-Tapia, Luis Eduardo, Hernandez, Glenn, Bruhn, Alejandro, De Backer, Daniel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer International Publishing 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7093634/
https://www.ncbi.nlm.nih.gov/pubmed/32211957
http://dx.doi.org/10.1186/s13613-020-00651-1
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author Ospina-Tascón, Gustavo A.
Bautista, Diego F.
Madriñán, Humberto J.
Valencia, Juan D.
Bermúdez, William F.
Quiñones, Edgardo
Calderón-Tapia, Luis Eduardo
Hernandez, Glenn
Bruhn, Alejandro
De Backer, Daniel
author_facet Ospina-Tascón, Gustavo A.
Bautista, Diego F.
Madriñán, Humberto J.
Valencia, Juan D.
Bermúdez, William F.
Quiñones, Edgardo
Calderón-Tapia, Luis Eduardo
Hernandez, Glenn
Bruhn, Alejandro
De Backer, Daniel
author_sort Ospina-Tascón, Gustavo A.
collection PubMed
description BACKGROUND: Ventilation/perfusion inequalities impair gas exchange in acute respiratory distress syndrome (ARDS). Although increased dead-space ventilation (V(D)/V(T)) has been described in ARDS, its mechanism is not clearly understood. We sought to evaluate the relationships between dynamic variations in V(D)/V(T) and extra-pulmonary microcirculatory blood flow detected at sublingual mucosa hypothesizing that an altered microcirculation, which is a generalized phenomenon during severe inflammatory conditions, could influence ventilation/perfusion mismatching manifested by increases in V(D)/V(T) fraction during early stages of ARDS. METHODS: Forty-two consecutive patients with early moderate and severe ARDS were included. PEEP was set targeting the best respiratory-system compliance after a PEEP-decremental recruitment maneuver. After 60 min of stabilization, hemodynamics and respiratory mechanics were recorded and blood gases collected. V(D)/V(T) was calculated from the CO(2) production ([Formula: see text] ) and CO(2) exhaled fraction ([Formula: see text] ) measurements by volumetric capnography. Sublingual microcirculatory images were simultaneously acquired using a sidestream dark-field device for an ulterior blinded semi-quantitative analysis. All measurements were repeated 24 h after. RESULTS: Percentage of small vessels perfused (PPV) and microcirculatory flow index (MFI) were inverse and significantly related to V(D)/V(T) at baseline (Spearman’s rho = − 0.76 and − 0.63, p < 0.001; R(2) = 0.63, and 0.48, p < 0.001, respectively) and 24 h after (Spearman’s rho = − 0.71, and − 0.65; p < 0.001; R(2) = 0.66 and 0.60, p < 0.001, respectively). Other respiratory, macro-hemodynamic and oxygenation parameters did not correlate with V(D)/V(T). Variations in PPV between baseline and 24 h were inverse and significantly related to simultaneous changes in V(D)/V(T) (Spearman’s rho = − 0.66, p < 0.001; R(2) = 0.67, p < 0.001). CONCLUSION: Increased heterogeneity of microcirculatory blood flow evaluated at sublingual mucosa seems to be related to increases in V(D)/V(T), while respiratory mechanics and oxygenation parameters do not. Whether there is a cause–effect relationship between microcirculatory dysfunction and dead-space ventilation in ARDS should be addressed in future research.
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spelling pubmed-70936342020-03-27 Microcirculatory dysfunction and dead-space ventilation in early ARDS: a hypothesis-generating observational study Ospina-Tascón, Gustavo A. Bautista, Diego F. Madriñán, Humberto J. Valencia, Juan D. Bermúdez, William F. Quiñones, Edgardo Calderón-Tapia, Luis Eduardo Hernandez, Glenn Bruhn, Alejandro De Backer, Daniel Ann Intensive Care Research BACKGROUND: Ventilation/perfusion inequalities impair gas exchange in acute respiratory distress syndrome (ARDS). Although increased dead-space ventilation (V(D)/V(T)) has been described in ARDS, its mechanism is not clearly understood. We sought to evaluate the relationships between dynamic variations in V(D)/V(T) and extra-pulmonary microcirculatory blood flow detected at sublingual mucosa hypothesizing that an altered microcirculation, which is a generalized phenomenon during severe inflammatory conditions, could influence ventilation/perfusion mismatching manifested by increases in V(D)/V(T) fraction during early stages of ARDS. METHODS: Forty-two consecutive patients with early moderate and severe ARDS were included. PEEP was set targeting the best respiratory-system compliance after a PEEP-decremental recruitment maneuver. After 60 min of stabilization, hemodynamics and respiratory mechanics were recorded and blood gases collected. V(D)/V(T) was calculated from the CO(2) production ([Formula: see text] ) and CO(2) exhaled fraction ([Formula: see text] ) measurements by volumetric capnography. Sublingual microcirculatory images were simultaneously acquired using a sidestream dark-field device for an ulterior blinded semi-quantitative analysis. All measurements were repeated 24 h after. RESULTS: Percentage of small vessels perfused (PPV) and microcirculatory flow index (MFI) were inverse and significantly related to V(D)/V(T) at baseline (Spearman’s rho = − 0.76 and − 0.63, p < 0.001; R(2) = 0.63, and 0.48, p < 0.001, respectively) and 24 h after (Spearman’s rho = − 0.71, and − 0.65; p < 0.001; R(2) = 0.66 and 0.60, p < 0.001, respectively). Other respiratory, macro-hemodynamic and oxygenation parameters did not correlate with V(D)/V(T). Variations in PPV between baseline and 24 h were inverse and significantly related to simultaneous changes in V(D)/V(T) (Spearman’s rho = − 0.66, p < 0.001; R(2) = 0.67, p < 0.001). CONCLUSION: Increased heterogeneity of microcirculatory blood flow evaluated at sublingual mucosa seems to be related to increases in V(D)/V(T), while respiratory mechanics and oxygenation parameters do not. Whether there is a cause–effect relationship between microcirculatory dysfunction and dead-space ventilation in ARDS should be addressed in future research. Springer International Publishing 2020-03-24 /pmc/articles/PMC7093634/ /pubmed/32211957 http://dx.doi.org/10.1186/s13613-020-00651-1 Text en © The Author(s) 2020 Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Research
Ospina-Tascón, Gustavo A.
Bautista, Diego F.
Madriñán, Humberto J.
Valencia, Juan D.
Bermúdez, William F.
Quiñones, Edgardo
Calderón-Tapia, Luis Eduardo
Hernandez, Glenn
Bruhn, Alejandro
De Backer, Daniel
Microcirculatory dysfunction and dead-space ventilation in early ARDS: a hypothesis-generating observational study
title Microcirculatory dysfunction and dead-space ventilation in early ARDS: a hypothesis-generating observational study
title_full Microcirculatory dysfunction and dead-space ventilation in early ARDS: a hypothesis-generating observational study
title_fullStr Microcirculatory dysfunction and dead-space ventilation in early ARDS: a hypothesis-generating observational study
title_full_unstemmed Microcirculatory dysfunction and dead-space ventilation in early ARDS: a hypothesis-generating observational study
title_short Microcirculatory dysfunction and dead-space ventilation in early ARDS: a hypothesis-generating observational study
title_sort microcirculatory dysfunction and dead-space ventilation in early ards: a hypothesis-generating observational study
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7093634/
https://www.ncbi.nlm.nih.gov/pubmed/32211957
http://dx.doi.org/10.1186/s13613-020-00651-1
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