A premature infant with persistent pulmonary hypertension of the newborn (PPHN) in the neonatal ICU is being switched from conventional mechanical ventilation to high frequency ventilation due to failure of conventional ventilation in achieving normalized arterial blood gases. The respiratory therapist notes that the tidal volumes delivered by the high frequency ventilator are less than the infant’s anatomical dead space. How does gas exchange occur in this circumstance?
[Answered]: A premature infant with persistent pulmonary…
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