Correct Answer: B

Rationale: The correct answer is B: Oligohydramnios. Oligohydramnios leads to reduced volume of amniotic fluid, which can result in poor fetal movements and inadequate cushioning for the fetus. This can increase the likelihood of abnormal fetal positions like shoulder presentation. Other choices are incorrect because: A: A sub-septate uterus is a structural uterine abnormality and not directly related to shoulder presentation. C: Prematurity may lead to preterm labor but is not specifically associated with shoulder presentation. D: Multiple pregnancy can increase the risk of malpresentation but is not a direct maternal cause of shoulder presentation.

Correct Answer: B

Rationale: The correct answer is B: Oligohydramnios. Oligohydramnios leads to reduced volume of amniotic fluid, which can result in poor fetal movements and inadequate cushioning for the fetus. This can increase the likelihood of abnormal fetal positions like shoulder presentation. Other choices are incorrect because: A: A sub-septate uterus is a structural uterine abnormality and not directly related to shoulder presentation. C: Prematurity may lead to preterm labor but is not specifically associated with shoulder presentation. D: Multiple pregnancy can increase the risk of malpresentation but is not a direct maternal cause of shoulder presentation.

Correct Answer: B

Rationale: The correct answer is B: Hyperextension casting. The AGACNP knows that this treatment is appropriate for a condition that requires immobilization and support while allowing controlled movement. Hyperextension casting provides stability and support while promoting healing. Observation (A) would not provide adequate treatment for a condition requiring immobilization. Jewett brace (C) is typically used for spinal fractures, not for conditions that require hyperextension casting. Surgical intervention (D) would be considered if conservative measures like casting have failed.

Correct Answer: A

Rationale: The correct answer is A because BCG vaccination is recommended for newborns regardless of maternal smear status to prevent tuberculosis. The neonate is at risk of TB exposure postnatally and needs protection. Maternal smear status does not affect the indication for BCG in the newborn. Choice B is incorrect because withholding BCG in this case would leave the neonate vulnerable to TB. Choices C and D are not applicable as they do not provide any information.

Correct Answer: A

Rationale: The correct answer is A: Descent, engagement, flexion, internal rotation. In left occipito-posterior position, the fetus descends into the pelvis, engages in the maternal pelvis, undergoes flexion to fit through the birth canal, and internally rotates to align with the pelvis for delivery. Choice B (Extension, engagement, internal rotation, external rotation) is incorrect because extension is not typically seen in occipito-posterior positions. Choice C (Flexion, descent, external rotation) is incorrect because external rotation is not part of the mechanism in this position. Choice D (Descent, engagement, extension) is incorrect because extension is not typically seen in this position.