Newborn Health.docx - Newborn Health Maternal Child Nursing Care Chapter 6 pp 156-167 Fetal Maturation o Fetal Stage lasts from week 9(when the fetus

Newborn Health.docx - Newborn Health Maternal Child Nursing...

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Newborn Health Maternal Child Nursing Care Chapter 6, pp. 156-167 Fetal Maturation: o Fetal Stage lasts from week 9 (when the fetus looks like a human) to the end of the pregnancy o The fetus is less vulnerable to teratogens, except ones affecting CNS functioning o Viability refers to the capability of the fetus to survive outside the uterus 22-25 weeks of gestation are on the threshold of viability Survival is based on CNS function and oxygenation capability of the lungs Fetal Circulatory System o The cardiovascular system is the first organ system to function Blood vessel and blood cell formation begins in the third week and supplies the embryo with oxygen and nutrients from the mother By the end of the third week, the tubular heart begins to beat During the fourth and fifth weeks, the heart develops into a four-
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Unformatted text preview: chambered organ By the end of the embryonic stage, the heart is developmentally complete o The fetal lungs do not function for respiratory gas exchange The circulatory pathway, ductus arteriosus bypasses the lungs Oxygen-rich blood from the placenta flows rapidly through the umbilical vein into the fetal abdomen This is where the blood gives up its wastes and carbon dioxide in exchange for nutrients and oxygen Three characteristics that enable the fetus to obtain sufficient oxygen: o Fetal hemoglobin carries 20-30% more oxygen than maternal hemoglobin o The hemoglobin concentration of the fetus is about 50% greater than that of the mother o The FHR is 110-160 bpm, making the cardiac output per unit of body weight higher than that of an adult...
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