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Prone positioning is not an airway clearance technique. It is used to correct ventilation to perfusion matching which is impaired in acute respiratory distress syndrome (ARDS).

Thread. #physiology #COVID2019 #cvpPT
Acute respiratory distress syndrome (ARDS) due to a viral infection (ex. COVID) is not an “airway clearance” problem. It’s a ventilation to perfusion problem due to changes in the epithelial layers of the type 1 alveolar cells and pulmonary capillary.
Normally those epithelial layers create a barrier that only permits at most a trace amount of fluid into the alveoli and the space between the layers. The space between the two layers is incredibly small, it is about 1 cell thick.
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