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.

Answer and Explanation

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.

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Correct Answer is B

Explanation

Choice A Reason: Shoulder dystocia. This is an incorrect answer that describes a diﬀerent obstetric complication. Shoulder dystocia is a condition where the baby's shoulder gets stuck behind the mother's pubic bone during delivery, which can cause nerve injury, fracture, or asphyxia to the baby. Shoulder dystocia does not cause fetal bradycardia, abdominal pain, or vaginal bleeding.

Choice B Reason: Placental abruption. This is a correct answer that explains the symptoms of fetal bradycardia, abdominal pain, and vaginal bleeding in a woman with a history of crack cocaine use. Placental abruption. This is because placental abruption is a condition where the placenta separates from the uterine wall before delivery, which can cause fetal distress, maternal hemorrhage, and shock. Placental abruption can be triggered by maternal hypertension, trauma, or substance abuse, such as crack cocaine.

Choice C Reason: Anaphylactoid syndrome of pregnancy. This is an incorrect answer that refers to a rare and fatal condition also known as amniotic ﬂuid embolism. Anaphylactoid syndrome of pregnancy is a condition where amniotic ﬂuid enters into the maternal bloodstream and causes an allergic reaction, which can lead to respiratory failure, cardiac arrest, coagulopathy, and coma. Anaphylactoid syndrome of pregnancy does not cause fetal bradycardia or vaginal bleeding.

Choice D Reason: Placenta previa. This is an incorrect answer that indicates another placental disorder. Placenta previa is a condition where the placenta covers or is near the cervix, which can cause painless bright red bleeding during pregnancy or labor. Placenta previa does not cause fetal bradycardia or abdominal pain.

A. Vitamin K will increase erythropoiesis. B. Vitamin K will enhance bilirubin breakdown. C. Vitamin K will stop Rh sensitization. D. Vitamin K will promote blood clotting ability. Vitamin K will promote blood clotting ability.

Correct Answer is D

Explanation

Choice A Reason: Vitamin K will increase erythropoiesis. This is an incorrect statement that confuses vitamin K with erythropoietin. Erythropoietin is a hormone that stimulates red blood cell production in the bone marrow. Vitamin K does not aﬀect erythropoiesis.

Choice B Reason: Vitamin K will enhance bilirubin breakdown. This is an incorrect statement that confuses vitamin K with phototherapy. Phototherapy is a treatment that exposes the newborn's skin to light, which converts bilirubin into water-soluble forms that can be excreted by the liver and kidneys. Bilirubin is a yellow pigment that results from the breakdown of red blood cells. High levels of bilirubin can cause jaundice and brain damage in newborns. Vitamin K does not aﬀect bilirubin metabolism.

Choice C Reason: Vitamin K will stop Rh sensitization. This is an incorrect statement that confuses vitamin K with Rh immune globulin. Rh immune globulin is an injection given to Rh-negative mothers who deliver Rh-positive babies, to prevent them from developing antibodies against Rh-positive blood cells in future pregnancies. Rh sensitization is a condition where the mother's immune system atacks the baby's blood cells, causing hemolytic disease of the newborn. Vitamin K does not aﬀect Rh sensitization.

Choice D Reason: Vitamin K will promote blood clotting ability. This is a correct statement that explains the rationale for administering vitamin K as prophylaxis to newborns. Vitamin K is essential for the synthesis of clotting factors in the liver. Newborns have low levels of vitamin K at birth due to poor placental transfer and lack of intestinal bacteria that produce vitamin K. Therefore, they are at risk of bleeding disorders such as hemorrhagic disease of the newborn.

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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:

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Naxlex Comprehensive Predictor Exams

Correct Answer is B

Explanation

The nurse administers vitamin K intramuscularly as prophylaxis to the newborn based on which of the following rationales? Select one:

Correct Answer is D

Explanation

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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: