The student nurse is preparing to assess the fetal heart rate (FHR). She has determined that the fetal back is located toward the client's left side, the small parts toward the right side, and there is a vertex (occiput) presentation. The student nurse should initially begin auscultation of the fetal heart rate in the mother's:

A) "Have you had any health concerns during your pregnancy?"
While it's important to assess the client's overall health and pregnancy history, this question doesn't directly address the current concern of possible labor and does not immediately help assess the client's status for labor evaluation. The focus should be on signs of labor or complications at this point.

B) "Do you have a support person present?"
Although this is a helpful question to ask in preparation for labor, it doesn't provide the necessary information needed to assess whether the client is in labor. The priority at this stage is determining if the client is in labor or experiencing any complications, such as rupture of membranes.

C) "Have you noticed any fluid leaking from your vagina?"
This is the most important question to ask next. If the client has ruptured membranes (i.e., water breaking), it is important to assess the timing and nature of the fluid leakage, as it would indicate the need for immediate evaluation at the hospital. Rupture of membranes requires monitoring for infection and should prompt the client to come in for assessment regardless of the frequency or intensity of contractions.
D) "When was your last prenatal visit?"
While it is helpful to know when the client had their last prenatal visit, this question does not directly address the issue of possible labor. The priority is to determine if the client is in labor, whether their membranes have ruptured, or if there are any other complications such as bleeding or abnormal fetal movement. The question about fluid leakage is more immediate and relevant to their current condition.

A) Uterine contractions:
While uterine contractions cause significant pain and discomfort during labor, particularly in the first and early second stages, by the time the client reaches the second stage of labor, the cervix is fully dilated, and the main cause of pain and pressure is no longer from the contractions themselves. Instead, the pain and pressure described in the second stage are primarily due to the fetal head descending through the birth canal, applying pressure to the perineum.

B) The fetal head applying pressure:
The pain and pressure reported in the second stage of labor are primarily due to the fetal head descending into and through the birth canal, putting pressure on the cervix, vagina, perineum, and pelvic floor. This pressure is a major source of discomfort in the second stage, as the fetal head stretches the tissues of the perineum, which is essential for facilitating birth. The sensation of pressure on the pelvic floor is often described by clients during this stage.

C) Nerve stimulation:
Nerve stimulation occurs during labor as a result of uterine contractions and the fetal descent, which can cause radiating pain to the lower back, thighs, and pelvic region. However, the specific pain and pressure in the pelvis and perineum described by the client are more directly related to the fetal head applying pressure, rather than generalized nerve stimulation. Nerve stimulation may contribute to pain but is not the primary cause of the pelvic and perineal pressure at this stage.

D) Cervical dilation:
Cervical dilation occurs in the earlier stages of labor (latent and active phases), and while it contributes to pain during these stages, by the second stage, the cervix should be fully dilated (10 cm). The pain and pressure that the client is feeling in the second stage are less about cervical dilation and more about the descent of the fetal head through the birth canal and its pressure on the perineum and pelvic floor.