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- Title
Microcirculatory dysfunction and dead-space ventilation in early ARDS: a hypothesis-generating observational study.
- Authors
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
- Abstract
Background: Ventilation/perfusion inequalities impair gas exchange in acute respiratory distress syndrome (ARDS). Although increased dead-space ventilation (VD/VT) has been described in ARDS, its mechanism is not clearly understood. We sought to evaluate the relationships between dynamic variations in VD/VT 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 VD/VT 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. VD/VT was calculated from the CO2 production ( V CO 2 ) and CO2 exhaled fraction ( F ECO 2 ) 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 VD/VT at baseline (Spearman's rho = − 0.76 and − 0.63, p < 0.001; R2 = 0.63, and 0.48, p < 0.001, respectively) and 24 h after (Spearman's rho = − 0.71, and − 0.65; p < 0.001; R2 = 0.66 and 0.60, p < 0.001, respectively). Other respiratory, macro-hemodynamic and oxygenation parameters did not correlate with VD/VT. Variations in PPV between baseline and 24 h were inverse and significantly related to simultaneous changes in VD/VT (Spearman's rho = − 0.66, p < 0.001; R2 = 0.67, p < 0.001). Conclusion: Increased heterogeneity of microcirculatory blood flow evaluated at sublingual mucosa seems to be related to increases in VD/VT, 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.
- Subjects
ADULT respiratory distress syndrome; POSITIVE end-expiratory pressure; HIGH-frequency ventilation (Therapy); RESPIRATORY mechanics; BLOOD flow
- Publication
Annals of Intensive Care, 2020, Vol 10, Issue 1, p1
- ISSN
2110-5820
- Publication type
Article
- DOI
10.1186/s13613-020-00651-1