The nurse is caring for a client who asks why their newborn needs a Vitamin K injection.
What is the nurse's best response?
Most mothers have a diet deficient in vitamin K, which results in the infant being deficient.
Vitamin K prevents the synthesis of prothrombin in the liver and must be given by injection.
Newborns cannot synthesize their own vitamin K which increases their risk of bleeding.
The supply of vitamin K is inadequate for at least the first year and must be supplemented.
The Correct Answer is C
The nurse must understand the physiological status of a newborns coagulation system and the role of intestinal flora. Knowledge of the mechanism of vitamin K synthesis and the prevention of Vitamin K Deficiency Bleeding is essential for this response.
Choice A rationale
Maternal diet is not the primary cause of newborn vitamin K deficiency. Even with a perfect maternal diet, vitamin K does not easily cross the placenta, leaving all newborns with low levels of the vitamin at birth.
Choice B rationale
This statement is scientifically incorrect because vitamin K actually promotes and is essential for the synthesis of prothrombin and other clotting factors in the liver. It does not prevent synthesis; it is a required cofactor for it.
Choice C rationale
Newborns have a sterile gut at birth, lacking the bacteria necessary to synthesize vitamin K. This deficiency impairs the production of clotting factors 2, 7, 9, and 10, significantly increasing the risk of life-threatening hemorrhagic disease.
Choice D rationale
Vitamin K is not needed for a full year via injection. Once the infant begins feeding and intestinal flora are established, they can synthesize their own vitamin K. The risk is highest during the first week..
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Managing the immediate postpartum period requires applying knowledge of uterine involution and the anatomical relationship between the bladder and uterus. Nurses must recognize how bladder distention affects uterine placement and the subsequent risk of hemorrhage from uterine atony.
Choice A rationale
Notifying the healthcare provider is not the initial step because the clinical findings are characteristic of a full bladder rather than a primary medical emergency. Correcting the bladder distention should occur first to assess if the fundus returns.
Choice B rationale
A full bladder displaces the uterus upward and to the right, preventing effective contraction. Assisting the client to void resolves the displacement, allows the fundus to descend, and promotes uterine contraction, which is the priority to prevent postpartum hemorrhage.
Choice C rationale
Pain medications do not address the physiological cause of a high, deviated fundus. While the client may have discomfort, the priority is mechanical correction of the bladder to ensure uterine safety and prevent excessive bleeding from atony.
Choice D rationale
While a catheter might be needed if the client cannot void, it is more invasive. The nurse should first attempt to assist the client to the bathroom or provide a bedpan before resorting to sterile catheterization.
Correct Answer is D
Explanation
Newborn transitions involve significant vasomotor changes during the first few hours of life. Understanding the physiological basis of acrocyanosis versus central cyanosis is critical to determine whether clinical findings represent a normal adaptation or a sign of respiratory or cardiac distress.
Choice A rationale
Hypothermia can cause peripheral vasoconstriction, but acrocyanosis is a standard finding in newborns regardless of temperature. While maintaining thermoregulation is important, the priority is recognizing the observation as a normal physiological transition during the first hours.
Choice B rationale
Activating an emergency response is indicated for central cyanosis, which involves the tongue and mucous membranes, signaling systemic hypoxia. Acrocyanosis limited to extremities does not indicate a life-threatening emergency requiring a code blue or resuscitation.
Choice C rationale
Blow-by oxygen is used for infants showing signs of respiratory distress or central cyanosis. Administering oxygen for isolated peripheral cyanosis is unnecessary and potentially harmful, as it does not address the normal vasomotor instability present in newborns.
Choice D rationale
Acrocyanosis, characterized by bluish hands and feet, is a normal finding during the first 24 to 48 hours of life. It results from poor peripheral circulation and vasomotor instability. Continued monitoring is the most appropriate nursing action.
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