In a client's seventh month of pregnancy, she reports feeling "dizzy, like I'm going to pass out, when I lie down flat on my back". The nurse explains that this is due to:
Select one:
Physiologic anemia due to maternal increased plasma volume.
Pressure of the gravid uterus on the maternal inferior vena cava and aorta.
Pressure of the presenting fetal part on the maternal diaphragm.
A 50% increase in maternal blood volume during pregnancy.
The Correct Answer is B
Choice A Reason: Physiologic anemia due to maternal increased plasma volume. This is an incorrect answer that refers to a different condition that affects hemoglobin levels, not blood pressure. Physiologic anemia is a condition where the maternal plasma volume increases more than the red blood cell mass during pregnancy, which dilutes the hemoglobin concentration and lowers the hematocrit value. Physiologic anemia does not cause significant symptoms or complications in pregnant women, as it is an adaptive mechanism that enhances oxygen delivery and prevents fluid overload.
Choice B Reason: Pressure of the gravid uterus on the maternal inferior vena cava and aorta. This is because this statement explains the cause of supine hypotensive syndrome, which is a condition where lying flat on the back causes compression of the major blood vessels by the gravid uterus, which reduces venous return and cardiac output, which lowers blood pressure and perfusion to vital organs. Supine hypotensive syndrome can cause symptoms such as dizziness, lightheadedness, nausea, pallor, or syncope in pregnant women, especially in the third trimester.
Choice C Reason: Pressure of the presenting fetal part on the maternal diaphragm. This is an incorrect answer that indicates a different condition that affects respiratory function, not blood pressure. Pressure of the presenting fetal part on the maternal diaphragm is a result of cephalic engagement or lightening, which occurs when the fetal head descends into the pelvis and occupies more space in the abdominal cavity. Pressure of the presenting fetal part on the maternal diaphragm can cause symptoms such as dyspnea, heartburn, or rib pain in pregnant women.
Choice D Reason: A 50% increase in maternal blood volume during pregnancy. This is an incorrect answer that describes a normal physiological change that occurs during pregnancy, not a cause of supine hypotensive syndrome. A 50% increase in maternal blood volume during pregnancy is due to increased production of plasma and red blood cells, which helps meet the increased oxygen and nutrient demands of the fetus and placenta, and prepares the mother for blood loss during delivery. A 50% increase in maternal blood volume during pregnancy does not cause hypotension or dizziness in pregnant women.

Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A Reason: "If I try to talk to my partner during a contraction, I can't." This is an incorrect answer that indicates a sign of true labor, not false labor. True labor is a condition where there are regular and painful uterine contractions that cause cervical dilation and effacement, and lead to delivery of the baby and placenta. True labor contractions are usually strong and consistent, and they tend to increase or persist with activity or position changes. True labor contractions can be so intense that they interfere with speech or breathing.
Choice B Reason: ) "My contractions slow down when I walk around." This is because this statement by the client would lead the nurse to suspect that the woman is experiencing false labor, which is also known as Braxton Hicks contractions or practice contractions. False labor is a condition where there are irregular and painless uterine contractions that do not cause cervical dilation or effacement. False labor can occur throughout pregnancy, but it becomes more noticeable and frequent in late pregnancy. False labor contractions are usually weak and inconsistent, and they tend to decrease or stop with activity or position changes.
Choice C Reason: "I feel contractions start mostly in my back and they sweep around to the top of my abdomen." This is an incorrect answer that indicates a sign of true labor, not false labor. True labor contractions usually start in the lower back and radiate to the lower abdomen or groin, following a wave-like patern. False labor contractions are more likely to be felt in the upper abdomen or sides, without a clear patern.
Choice D Reason: "My contractions are about 6 minutes apart and regular." This is an incorrect answer that indicates a sign of true labor, not false labor. True labor contractions usually have a regular frequency and duration, and they become closer and longer as labor progresses. False labor contractions are more likely to have an irregular frequency and duration, and they do not change significantly over time.
Correct Answer is D
Explanation
Choice A Reason: "Your body is responding to the events of labor, just like after a tough workout." This is an inaccurate statement that does not explain the cause of the contractions or reassure the client.
Choice B Reason: "This could be a sign that your body is trying to get rid of retained placental fragments." This is an alarming statement that may scare the client and imply that something is wrong. Retained placental fragments are rare and usually cause heavy bleeding, fever, and infection.
Choice C Reason: "Let me check your vaginal discharge just to make sure everything is fine." This is an unnecessary statement that does not answer the client's question or provide any information.
Choice D Reason:"The baby's sucking releases oxytocin which causes your uterus to contract." This is a correct statement that explains the physiological mechanism of the contractions and reassures the client that they are normal and beneficial.
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