A pregnant woman's biophysical profile score is 8. She asks the nurse to explain the results. The nurse's best response is:

Choice A reason: This is incorrect because a donor embryo is not used in IVF-ET. A donor embryo is an embryo that was created from another couple's gametes and donated to an infertile couple. IVF-ET uses the couple's own gametes to create an embryo.

Choice B reason: This is incorrect because it is dismissive and unprofessional. The nurse should respect the husband's curiosity and provide accurate and clear information about the procedure. The nurse should also address any concerns or questions that the couple may have.

Choice C reason: This is correct because it is a concise and accurate description of the IVF-ET procedure. The nurse explains the main steps and the purpose of the procedure in simple terms.

Choice D reason: This is incorrect because donor sperm is not used in IVF-ET. Donor sperm is sperm that was obtained from another man and donated to an infertile couple. IVF-ET uses the husband's own sperm to fertilize the wife's eggs.

Choice A reason: Cerebral compression is the cause of early decelerations, as it reflects the fetal head compression during uterine contractions. Early decelerations are decreases in the FHR that begin and end with the onset and end of a contraction, respectively. They are symmetrical and mirror the shape of the contraction. Early decelerations are normal and benign, as they indicate that the fetus is responding to the increased intracranial pressure and maintaining adequate oxygenation.

Choice B reason: Cord compression is not the cause of early decelerations but of variable decelerations. Variable decelerations are abrupt and irregular decreases in the FHR that vary in onset, duration, and depth. They are usually caused by the umbilical cord being compressed or occluded by the fetal body, the maternal pelvis, or the uterine contractions. Variable decelerations can indicate fetal distress or hypoxia, especially if they are severe, frequent, or prolonged.

Choice C reason: Uteroplacental insufficiency is not the cause of early decelerations, but of late decelerations. Late decelerations are decreases in the FHR that begin after the peak of a contraction and return to the baseline after the contraction ends. They are symmetrical and have a gradual onset and recovery. They are usually caused by the reduced blood flow and oxygen delivery to the placenta and the fetus due to maternal or fetal factors. Late decelerations can indicate fetal distress or hypoxia, and require immediate intervention.

Choice D reason: Spontaneous rupture of membranes is not the cause of early decelerations, but it can be a risk factor for cord compression and variable decelerations. Spontaneous rupture of membranes is the breaking of the amniotic sac and the release of the amniotic fluid, which usually occurs during labor or shortly before it. Spontaneous rupture of membranes can cause the umbilical cord to prolapse or slip into the vagina, where it can be compressed or kinked by the fetal head or the contractions.