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1.Increased aortic pressure
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2.Increased systemic/decreased pulmonary pressure
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3.Closure of foramen ovale – functionally 1-2 hours
after birth
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4.Closure of Ductus arteriosus – functionally within
15 hours after birth r/t prostaglandin
E2
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5.Measurement of HR
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6.Neonatal RBCs have a life span of 80 to 100 days,
2/3 life span of adult RBC. In 1st
days of life, hematocrit may rise to 1 to 1 g/dL above fetal levels as a
result of placental transfusion, low oral fluid intake and diminished
extracellular fluid volume. By 1 week
postnatally, peripheral hemoglobin is comparable to fetal blood counts. The hgb level declines progressively over
the first 2 to 3 months of live. This
initial decline in hemoglobin creates a phenomenon know as physiologic anemia
of infancy.
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