What is the recommended upper limit to keep end-inspiratory transpulmonary pressure to minimize alveolar overdistension?

What is the recommended upper limit to keep end-inspiratory transpulmonary pressure to minimize alveolar overdistension?

• A. 10-15 cm H2O
• B. 20-25 cm H2O
• C. 30-35 cm H2O
• D. 5-10 cm H2O

Answer: (B)

End-inspiratory transpulmonary pressure is the actual distending pressure across the lung at the end of inspiration. In protective ventilation, the goal is to maintain recruitment without causing alveolar overdistension. Estimating transpulmonary pressure—by subtracting pleural pressure (often via an esophageal probe) from airway pressure—helps tailor ventilation to the lung’s true distending pressure rather than just airway pressure alone. Keeping this end-inspiratory transpulmonary pressure around 20–25 cm H2O provides enough force to keep alveoli open but limits the risk of volutrauma from excessive stretching. Values higher than this increase the danger of overdistension, while values too low risk derecruitment.

End-inspiratory transpulmonary pressure is the actual distending pressure across the lung at the end of inspiration. In protective ventilation, the goal is to maintain recruitment without causing alveolar overdistension. Estimating transpulmonary pressure—by subtracting pleural pressure (often via an esophageal probe) from airway pressure—helps tailor ventilation to the lung’s true distending pressure rather than just airway pressure alone. Keeping this end-inspiratory transpulmonary pressure around 20–25 cm H2O provides enough force to keep alveoli open but limits the risk of volutrauma from excessive stretching. Values higher than this increase the danger of overdistension, while values too low risk derecruitment.