During the delivery, which fetal position would be considered optimal for a vaginal birth?
Occiput anterior.
Occiput posterior.
Breech.
Transverse.
The Correct Answer is A
Choice A rationale
The occiput anterior (OA) position is considered the optimal fetal position for vaginal birth. In this position, the baby’s head is down, and the back of the head (occiput) is facing the mother’s front. This position allows for the most efficient passage through the birth canal.
Choice B rationale
The occiput posterior (OP) position, where the baby’s head is down but facing the mother’s back, can lead to a longer and more painful labor. It is not considered optimal for vaginal birth.
Choice C rationale
Breech positions, where the baby’s buttocks or feet are positioned to come out first, are not optimal for vaginal birth and often require a cesarean section due to the increased risk of complications.
Choice D rationale
The transverse position, where the baby is lying sideways across the uterus, is not suitable for vaginal birth. This position typically requires a cesarean section to safely deliver the baby.
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Correct Answer is A
Explanation
Choice A rationale
This statement is incorrect. Vagus nerve stimulation actually decreases FHR variability. The vagus nerve, part of the parasympathetic nervous system, slows the heart rate and reduces variability.
Choice B rationale
This statement is correct. Baroreceptors are sensors located in blood vessels that help regulate blood pressure by detecting changes in the stretch of the vessel walls. They play a crucial role in maintaining stable blood pressure levels.
Choice C rationale
This statement is correct. The autonomic nervous system, which includes the sympathetic and parasympathetic nervous systems, controls the fetal heart rate. It regulates the balance between heart rate acceleration and deceleration.
Choice D rationale
This statement is correct. Chemoreceptors respond to changes in blood gas levels, such as oxygen and carbon dioxide. They help regulate respiratory and cardiovascular responses to maintain homeostasis.
Correct Answer is B
Explanation
Choice A rationale
Uterine contractions that cause variable decelerations are not specific to true labor. Variable decelerations are typically associated with umbilical cord compression and can occur during both true and false labor.
Choice B rationale
Regular uterine contractions that cause cervical change are a definitive sign of true labor. True labor is characterized by contractions that become progressively stronger, more frequent, and more regular, leading to cervical dilation and effacement. This process indicates that the body is preparing for childbirth.
Choice C rationale
The station of the presenting part refers to the position of the fetus in relation to the ischial spines of the pelvis. While it is an important aspect of labor progression, it is not a definitive sign of true labor.
Choice D rationale
Rupture of the membranes, or the breaking of the water, can occur before true labor begins. While it often indicates that labor is imminent, it is not a definitive sign of true labor on its own.