Which of the following statements about Group B Streptococcus (GBS) in pregnancy is true?
GBS can only be transmitted to the baby during cesarean delivery.
GBS is a common bacterium found in the vaginal flora of women and is harmless in all cases.
Screening for GBS is typically performed at the first prenatal visit.
Intravenous antibiotics during labor are recommended for GBS-positive mothers to prevent neonatal infection.
The Correct Answer is D
Choice A rationale
GBS can be transmitted to the baby during both vaginal and cesarean deliveries if the mother is colonized with the bacteria. It is not limited to cesarean sections, hence why appropriate screening and treatment are essential.
Choice B rationale
GBS, although often harmless in the general population, can cause severe infections in newborns. This bacterium can be a source of severe neonatal infections like sepsis, pneumonia, and meningitis, necessitating preventive measures during pregnancy and delivery.
Choice C rationale
Screening for GBS is typically performed between 35 and 37 weeks of gestation, not at the first prenatal visit. This timing ensures accurate detection of the bacteria closer to the time of delivery.
Choice D rationale
Intravenous antibiotics during labor are recommended for mothers who test positive for GBS to prevent transmission to the baby. This intervention significantly reduces the risk of neonatal GBS infection.
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Correct Answer is B
Explanation
Choice A rationale
Uteroplacental insufficiency typically results in late decelerations, not a sudden drop in fetal heart rate, which is more commonly caused by umbilical cord compression.
Choice B rationale
Umbilical cord compression can cause variable decelerations, which are characterized by a sudden drop in fetal heart rate. This occurs due to the umbilical cord being compressed,
leading to decreased blood flow and oxygen to the fetus.
Choice C rationale
Maternal bradycardia refers to a slow maternal heart rate and does not directly cause changes in the fetal heart rate pattern.
Choice D rationale
Fetal head compression typically causes early decelerations, which are gradual decreases in fetal heart rate that occur with contractions and are usually benign.
Correct Answer is D
Explanation
Choice A rationale
A family history of breast cancer, particularly in a close relative like a sister, is a significant risk factor for breast cancer.
Choice B rationale
Exposure to radiation, particularly in the chest area, increases the risk of developing breast cancer.
Choice C rationale
Current use of oral contraceptives can slightly increase the risk of breast cancer, though the risk diminishes after stopping the pills.
Choice D rationale
Age less than 25 years is not a risk factor for breast cancer; risk increases with age.