Before applying a cord clamp, the nurse assesses the umbilical cord for vessels. The nurse expects to find: Select one:

Two arteries, one vein.

Two veins, one artery.

Two veins, two arteries.

One artery, one vein.

Answer and Explanation

The Correct Answer is A

Choice A Reason: Two arteries, one vein. This is because two arteries and one vein are the normal components of the umbilical cord, which is a structure that connects the fetus to the placenta and provides blood circulation between them. The umbilical cord carries oxygenated blood from the placenta to the fetus through the umbilical vein, and deoxygenated blood from the fetus to the placenta through the umbilical arteries.

Choice B Reason: Two veins, one artery. This is an incorrect answer that indicates an abnormal anatomy of the umbilical cord, which is known as single umbilical artery (SUA). SUA is a condition where there is only one umbilical artery instead of two, which can reduce blood ﬂow and oxygen delivery to the fetus. SUA can be associated with congenital anomalies or growth restriction in some cases.

Choice C Reason: Two veins, two arteries. This is an incorrect answer that indicates an abnormal anatomy of the umbilical cord, which is known as double umbilical vein (DUV). DUV is a condition where there are two umbilical veins instead of one, which can increase blood ﬂow and oxygen delivery to the fetus. DUV can be associated with fetal overgrowth or polycythemia in some cases.

Choice D Reason: One artery, one vein. This is an incorrect answer that indicates an abnormal anatomy of the umbilical cord, which is also known as single umbilical artery (SUA). SUA is a condition where there is only one umbilical artery instead of two, which can reduce blood ﬂow and oxygen delivery to the fetus. SUA can be associated with congenital anomalies or growth restriction in some cases.

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Correct Answer is B

Explanation

Choice A Reason: Vascular spider veins. This is an incorrect answer that refers to a diﬀerent skin change that occurs during pregnancy, which aﬀects the blood vessels, not the pigment. Vascular spider veins are small red or purple clusters of blood vessels that appear on the skin, especially on the face, neck, chest, or legs. Vascular spider veins are caused by increased blood volume and hormonal changes, which dilate and rupture the capillaries. Vascular spider veins are harmless and usually disappear after delivery.

Choice B Reason: Linea nigra. This is because linea nigra is a term that refers to a darkened vertical line that appears on the abdomen during pregnancy, which runs from the umbilicus to the pubis. Linea nigra is caused by increased production of melanin, which is a pigment that gives color to the skin and hair. Linea nigra is more common and noticeable in women with darker skin tones, and it usually fades after delivery.

Choice C Reason: Melasma. This is an incorrect answer that refers to a diﬀerent skin change that occurs during pregnancy, which aﬀects the pigment, but not in a linear patern. Melasma is a term that refers to patches of brown or gray-brown discoloration that appear on the face, especially on the forehead, cheeks, nose, or upper lip. Melasma is also caused by increased production of melanin, but it is inﬂuenced by sun exposure and genetic factors. Melasma is also known as chloasma or the mask of pregnancy, and it may persist after delivery.

Choice D Reason: Striae gravidarum. This is an incorrect answer that refers to a diﬀerent skin change that occurs during pregnancy, which aﬀects the connective tissue, not the pigment. Striae gravidarum are stretch marks that appear on the skin, especially on the abdomen, breasts, hips, or thighs. Striae gravidarum are caused by rapid growth and stretching of the skin, which damage the collagen and elastin fibers. Striae gravidarum are initially red or purple, but they fade to white or silver after delivery.

A. Physiologic anemia due to maternal increased plasma volume. B. Pressure of the gravid uterus on the maternal inferior vena cava and aorta. C. Pressure of the presenting fetal part on the maternal diaphragm. D. A 50% increase in maternal blood volume during pregnancy.

Correct Answer is B

Explanation

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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Before applying a cord clamp, the nurse assesses the umbilical cord for vessels. The nurse expects to find: Select one:

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Naxlex Comprehensive Predictor Exams

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Correct Answer is B

Explanation

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Correct Answer is B

Explanation

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