A nurse is assessing a newborn who has late-onset VKDB due to exclusive breastfeeding and inadequate oral vitamin K supplementation.

Which of the following findings should indicate a possible intracranial hemorrhage to the nurse?

Bulging fontanelle

Sunken eyes

Mottled skin

Flaring nostrils

Answer and Explanation

The Correct Answer is A

The correct answer is choice A. Bulging fontanelle.

A bulging fontanelle is a sign of increased intracranial pressure, which can be caused by intracranial hemorrhage.

Late-onset VKDB is a condition that occurs in infants who have low levels of vitamin K, which is essential for blood clotting. Most cases of late-onset VKDB present with intracranial hemorrhage.

Choice B. Sunken eyes is wrong because it is a sign of dehydration, not intracranial hemorrhage.

Choice C. Mottled skin is wrong because it is a sign of poor circulation or shock, not intracranial hemorrhage.

Choice D. Flaring nostrils is wrong because it is a sign of respiratory distress, not intracranial hemorrhage.

Normal ranges for vitamin K plasma concentrations are 0.2 to 3.2 ng/mL for adults and 0.15 to 1.5 ng/mL for infants.

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Correct Answer is A

Explanation

The correct answer is choice A.Factor II, also known as prothrombin, is one of the coagulation factors that are activated by vitamin K.Vitamin K is a cofactor for the carboxylation of specific glutamic acid groups in coagulation factors II, VII, IX, and X.

This process is essential for the activation of these factors in the coagulation cascade.

Choice B is wrong because factor V is not a vitamin K-dependent coagulation factor.

Factor V is activated by thrombin and acts as a cofactor for factor Xa in the conversion of prothrombin to thrombin.

Choice C is wrong because factor VIII is not a vitamin K-dependent coagulation factor.

Factor VIII is activated by thrombin and acts as a cofactor for factor IXa in the activation of factor X.

Choice D is wrong because factor XI is not a vitamin K-dependent coagulation factor.

Factor XI is activated by factor XIIa and activates factor IX in the intrinsic pathway of coagulation.

Normal ranges for coagulation factors are:

• Factor II: 70-120% of normal activity

• Factor V: 50-150% of normal activity

• Factor VIII: 50-150% of normal activity

• Factor IX: 50-150% of normal activity

• Factor X: 70-140% of normal activity

• Factor XI: 70-150% of normal activity

A. Glycogen B. Glucose C. Insulin D. Glucagon

Correct Answer is A

Explanation

The correct answer is choice A. Glycogen.Preterm newborns have limited stores of glycogen, which is a substance made from glucose that is stored in the liver and muscle cells to be used later for energy.When blood glucose levels are low, the hormone glucagon signals the cells to convert glycogen back into glucose and release it into the bloodstream.However, preterm newborns have a reduced ability to produce glucagon and to use gluconeogenesis, which is the process of making new glucose from other sources.Therefore, they are at risk of hypoglycemia, which is a condition where blood glucose levels are too low to support normal brain function.

Choice B is wrong because glucose is the sugar that travels through the blood to fuel the cells, not a substance that is stored for later use.

Choice C is wrong because insulin is a hormone that helps cells absorb glucose from the blood, not a substance that is stored for later use.

Choice D is wrong because glucagon is a hormone that triggers the release of glucose from the liver and muscle cells, not a substance that is stored for later use.

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A nurse is assessing a newborn who has late-onset VKDB due to exclusive breastfeeding and inadequate oral vitamin K supplementation. Which of the following findings should indicate a possible intracranial hemorrhage to the nurse?

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Naxlex Comprehensive Predictor Exams

A nurse is reviewing laboratory results for a newborn who received vitamin K injection at birth. Which of the following coagulation factors should be activated by vitamin K?

Correct Answer is A

Explanation

A nurse is caring for a preterm newborn who has hypoglycemia due to inadequate gluconeogenesis. The nurse should understand that this condition occurs because preterm newborns have limited stores of which of the following substances?

Correct Answer is A

Explanation

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A nurse is assessing a newborn who has late-onset VKDB due to exclusive breastfeeding and inadequate oral vitamin K supplementation.

Which of the following findings should indicate a possible intracranial hemorrhage to the nurse?