Respiratory Problems In Preg Flashcards
Most investigators define ARDS as
radiographically documented pulmonary infiltrates, a ratio of arterial oxygen tension to the fraction of inspired oxygen (PaO2:FiO2) <200, and no evidence of heart failure (Baron, 2018).
Three stages describe ARDS development
First, the exudative phase follows widespread injury to the alveolar epithelium and to the microvascular endothelium, including the pulmonary vasculature. This endotheliopathy results in increased pulmonary capillary permeability, surfactant loss or inactivation, diminished lung volume, and vascular shunting that creates arterial hypoxemia. Next, the proliferative phase usually begins approximately 7 days later and lasts up to 21 days. Most patients recover during this phase. Last, the fibrotic phase results from healing. Despite these insults, the long-term prognosis for pulmonary function is surprisingly good
