During the first 72 hours in the life of a healthy newborn, what changes would be expected in arterial blood gases?
I. pH would increase
II. PaCO₂ would decrease
III. HCO₃- would increase
IV. PaO₂ would increase

Question

Quizplus · Accepted Answer

During the first 72 hours of life, a healthy newborn undergoes a transition from fetal to neonatal circulation. This transition is characterized by a decrease in PaCO2 and an increase in PaO2, as the newborn begins to breathe air and establish pulmonary gas exchange. The pH and HCO3- levels also increase slightly as the newborn's body adjusts to the new environment.

During the First 72 Hours in the Life of a Healthy