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Determination of optimum PEEP levels remains an elusive goal. One factor is the recruitability of the lung, yet this is another difficult determination. Recently, a simple bedside technique, called the recruitment-to-inflation ratio, has been described and validated by comparison to the dual pressure-volume curve method. We describe the prior research and concepts of lung mechanics leading up to this metric and develop some background mathematics that help clinicians understand its meaning. [ABSTRACT FROM AUTHOR]

B Learning Objectives: b Inhaled epoprostenol (iEPO) is utilized to decrease pulmonary arterial pressure, and improve oxygenation. Adult ICU patients receiving iEPO for acute respiratory distress syndrome (ARDS), pulmonary hypertension (pHTN), or right ventricular (RV) failure were evaluated. [Extracted from the article]