A nurse is admitting a term newborn to the nursery following a cesarean birth. The nurse observes that the newborn's skin is slightly yellow. This finding indicates the newborn is experiencing a complication related to which of the following?
Maternal/newborn blood group incompatibility
Absence of vitamin K
Maternal cocaine abuse
Physiologic jaundice
The Correct Answer is A
Choice A reason:
Maternal/newborn blood group incompatibility is the most common cause of pathologic jaundice, which appears within the first 24 hours of life. This occurs when the mother's antibodies attack the newborn's red blood cells, causing hemolysis and increased bilirubin production. The excess bilirubin causes the yellowish discoloration of the skin and mucous membranes.
Choice B reason:
The absence of vitamin K is not related to jaundice but to hemorrhagic disease of the newborn. Vitamin K is essential for blood clotting and is given to newborns as an injection shortly after birth. Newborns are at risk of vitamin K deficiency because they have low levels of vitamin K in their bodies and breast milk, and their intestinal bacteria are not yet able to synthesize vitamin K.
Choice C reason:
Maternal cocaine abuse can cause many complications for the newborn, such as prematurity, low birth weight, neonatal abstinence syndrome, neurobehavioral problems, and congenital anomalies. However, it is not a direct cause of jaundice in the newborn.
Choice D reason:
Physiologic jaundice is a normal and benign condition that affects about 60% of term newborns. It occurs due to the immature liver's inability to metabolize bilirubin effectively. It usually appears after the first 24 hours of life and peaks around the third or fourth day. It does not require treatment unless the bilirubin level is very high or rising rapidly.
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Correct Answer is D
Explanation
Choice A reason:
This statement is incorrect because special lights are used to treat jaundice, not PKU. Jaundice is a condition that causes yellowing of the skin and eyes due to high levels of bilirubin in the blood. Bilirubin is a waste product that is normally removed by the liver. Special lights help break down bilirubin so that it can be excreted from the body.
Choice B reason:
This statement is correct because PKU is a genetic disorder that can be corrected by diet. PKU is caused by a lack of an enzyme that breaks down phenylalanine, an amino acid found in protein-rich foods. Phenylalanine can build up in the blood and cause brain damage and other health problems if not treated. A diet that is low in phenylalanine and high in a special formula can prevent these complications.
Choice C reason:
This statement is correct because sometimes the test is repeated in the doctor's office at the 2-week check-up. The PKU test is done one to three days after birth, but it may not be accurate if the baby has not had enough protein in their diet before the test. A repeat test may be needed to confirm or rule out PKU.
Choice D reason:
This statement is incorrect because the baby must take formula or breast milk after the test is done, not before. The test measures the level of phenylalanine in the blood, which will be higher if the baby has eaten protein-rich foods. The test should be done after the baby has fasted for at least two hours.
Correct Answer is C
Explanation
Choice A reason:
Asymmetrical breathing is not a sign of meconium aspiration syndrome (MAS). It is a sign of diaphragmatic hernia, a condition where the abdominal organs push into the chest cavity and interfere with lung development.
Choice B reason:
Born before 38 weeks gestation is not a sign of MAS. It is a risk factor for respiratory distress syndrome (RDS), a condition where the lungs are not fully developed and lack surfactant, a substance that helps keep the air sacs open.
Choice C reason:
Yellow-green staining on the umbilical cord is a sign of MAS. It indicates that the baby has passed meconium into the amniotic fluid before or during birth and may have inhaled it into the lungs. Meconium is a sticky substance that becomes the baby's first poop. It can block or irritate the airways, damage lung tissue and prevent oxygen exchange.
Choice D reason:
Acrocyanosis is not a sign of MAS. It is a normal finding in newborns where the hands and feet appear bluish due to immature circulation. It usually resolves within 24 to 48 hours after birth.
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