A nurse is caring for a client who has just delivered her first newborn. The nurse anticipates hyperbilirubinemia due to Rh incompatibility. The nurse should understand that hyperbilirubinemia occurs with Rh incompatibility for which of the following reasons?
The client's blood does not contain the Rh factor, so she produces anti-Rh antibodies that cross the placental barrier and cause hemolysis of red blood cells in newborns.
The client's blood contains the Rh factor, and the newborn's does not, and antibodies that destroy red blood cells are formed in the fetus.
The client has a history of receiving a transfusion with Rh-negative blood.
The client's anti-A and anti-B antibodies cross the placenta and cause the destruction of the fetal red blood cells.
The Correct Answer is A
Choice A rationale:
Rh incompatibility occurs when an Rh-negative client is exposed to Rh-positive fetal blood, typically during a prior pregnancy or delivery. The client’s immune system produces anti-Rh antibodies that cross the placenta in subsequent pregnancies, attacking the Rh-positive red blood cells of the fetus. This hemolysis releases bilirubin, leading to hyperbilirubinemia in the newborn.
Choice B rationale:
Rh incompatibility only occurs when the client is Rh-negative and the fetus is Rh-positive. An Rh-positive client will not form antibodies against an Rh-negative fetus, as their immune system recognizes the Rh factor as normal.
Choice C rationale:
This choice is not related to the mechanism of Rh incompatibility. Receiving a transfusion with Rh-negative blood would not cause the mother's immune system to produce anti-Rh antibodies or lead to Rh incompatibility with her newborn.
Choice D rationale:
This choice describes the ABO blood group system, not the Rh factor. ABO incompatibility can occur when a mother with blood type O (producing anti-A and anti-B antibodies) has a newborn with blood type A, B, or AB, leading to hemolysis of the fetal red blood cells. However, the question specifically mentions Rh incompatibility, which involves the Rh factor, not the ABO system.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason:
Nevus flammeus, also known as a port-wine stain, is a flat, pink, red, or purple mark on the skin present at birth. It is a congenital vascular malformation and does not involve swelling that crosses suture lines.
Choice B reason:
Caput succedaneum is the correct diagnosis for swelling that crosses suture lines on a newborn's head, typically associated with a prolonged or difficult vaginal delivery, especially with the use of vacuum extraction.
Choice C reason:
Cephalohematoma is a collection of blood under the periosteum of the cranial bones that does not cross suture lines. It appears soon after birth and is usually caused by birth trauma.
Choice D reason:
Erythema toxicum is a common rash in newborns, presenting as red patches with small white or yellow pustules. It does not cause swelling over the head that crosses suture lines.
Correct Answer is C
Explanation
Choice A rationale:
Polyuria is not an adverse effect of epidural anesthesia. It is unrelated to this type of pain control.
Choice B rationale:
Hypertension is not an adverse effect of epidural anesthesia. Epidurals can actually cause a decrease in blood pressure due to vasodilation.
Choice C rationale:
This is the correct choice. Pruritus, or itching, is a common adverse effect of epidural anesthesia caused by the release of histamines from local anesthetics.
Choice D rationale:
Dry mouth is not an adverse effect of epidural anesthesia. Dry mouth is more commonly associated with general anesthesia or medications with anticholinergic effects.
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