Which factor ensures that the smallest anterior-posterior diameter of the fetal head enters the pelvis?

Correct Answer: B

Rationale: The correct answer is B: Flexion. Flexion of the fetal head is crucial for the smallest anterior-posterior diameter to enter the pelvis first. This position optimizes the fit of the fetal head through the maternal pelvis, reducing the risk of complications during labor. Station (A) refers to the level of the presenting part in the pelvis, descent (C) is the downward movement of the fetus, and engagement (D) is when the widest diameter of the fetal head passes through the maternal pelvic inlet. However, these factors do not specifically address the orientation of the fetal head to ensure the smallest diameter enters the pelvis.

Correct Answer: A

Rationale: The correct answer is A: total duration of labor. Nullipara refers to a woman giving birth for the first time, while multipara refers to a woman who has given birth multiple times. The primary difference between their labors is the total duration. Nulliparas typically have longer labors due to the body's first experience with childbirth. The other choices (B, C, D) are not the primary difference between nullipara and multipara labors. Pain experience, cervical dilation, and labor mechanisms can vary based on individual factors, but the key distinction lies in the overall duration of labor based on parity.

Correct Answer: B

Rationale: The correct answer is B: Notify the health care provider. In the case of a transverse lie, the fetus is positioned sideways in the uterus, which can lead to complications during labor. Notifying the health care provider is crucial as they will need to assess the situation and determine the appropriate course of action, such as attempting to manually rotate the fetus or preparing for a cesarean section if necessary. Performing a vaginal exam (choice A) may not be safe or effective in this situation. Initiating parenteral therapy (choice C) and applying oxygen (choice D) are not the priority interventions in the case of a transverse lie.

Correct Answer: D

Rationale: The correct answer is D: pattern of uterine contractions. This is because the pattern of contractions is a key indicator of true labor. True labor contractions are regular, increasing in frequency, duration, and intensity. Assessing the pattern helps differentiate true labor from false labor. A: Cervical dilation is important but may not necessarily indicate true labor as it can occur in false labor as well. B: The amount of bloody show is a sign of cervical changes, but it alone does not confirm true labor. C: Fetal position and station are important for labor progress but do not definitively confirm true labor. In summary, assessing the pattern of uterine contractions is crucial in determining true labor as it provides direct insight into the progression and intensity of contractions, distinguishing it from false labor.

Correct Answer: A

Rationale: The correct answer is A because the patient's irregular contraction pattern and varying duration indicate early labor. By asking the patient about the contraction pattern, the nurse can assess the progression of labor and provide appropriate guidance. Choice B is incorrect because if the patient's membranes have ruptured, she would most likely feel a gush of fluid rather than just feeling wet. Choice C is incorrect as bloody show is not typically a reliable indicator of early labor. Choice D is incorrect as it does not address the need to assess the contraction pattern for progression of labor.