Discover the groundbreaking insights into how regional pulmonary perfusion and blood volume dynamics evolve in the early stages of Acute Respiratory Distress Syndrome (ARDS), shedding light on potential therapeutic targets.
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Regional pulmonary perfusion, blood volume, and their relationship change in experimental early ARDS.
Santos et al., Sci Rep 2024
<!– DOI: 10.1038/s41598-024-56565-6 //–>
https://doi.org/10.1038/s41598-024-56565-6
This study investigates the relationship between regional pulmonary perfusion (Q) and blood volume (Fb) imaging in the context of early acute respiratory distress syndrome (ARDS) in sheep. The hypothesis was that vascular changes in early ARDS would affect Q and Fb differently. Over 20 hours, five anesthetized sheep underwent lung protective mechanical ventilation with continuous endotoxin infusion, simulating early ARDS conditions. Using Positron Emission Tomography (PET) with 18F-FDG and 13NN, the researchers analyzed Fb and Q in 30 regions of interest, normalized by tissue content (Fbn and Qn, respectively). The results showed significant differences in the Fbn-Qn relationship before and after lung injury, shifting from a linear to a curvilinear model. This indicates that endotoxin-associated early ARDS alters the relationship between Fb and Q, likely due to changes in vasoactive blood flow regulation, challenging the accuracy of Fb imaging as a surrogate for regional Q. This finding is important as it suggests that pulmonary conditions can significantly impact the relationship between blood volume and perfusion, affecting the utility of Fb imaging in clinical settings.