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Physiological parameters during in vivo ventilation. Peak inspiratory pressure (PIP) (solid line, left axis) was determined every 15 minutes; arterial partial pressure of oxygen over fraction of inspired oxygen (PaO2/FiO2) (dashed line, right axis) was determined at time 0, 120, and 240 minutes of in vivo mechanical ventilation. *P< 0.05 versus time 0, ±SEM.
