which disorder is characterized by demyelination of neurons in the central nervous system
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HESI PN Exit Exam 2023

1. Which disorder is characterized by demyelination of neurons in the central nervous system?

Correct answer: A

Rationale: Multiple sclerosis is the correct answer. It is an autoimmune disease that specifically targets and damages the myelin sheath surrounding neurons in the central nervous system. This demyelination disrupts the transmission of nerve signals and leads to a variety of neurological symptoms. Parkinson's disease (Choice B), Alzheimer's disease (Choice C), and Huntington's disease (Choice D) are neurodegenerative disorders that do not primarily involve demyelination of neurons in the CNS. Parkinson's disease is characterized by the loss of dopamine-producing neurons, Alzheimer's disease by the formation of plaques and tangles in the brain, and Huntington's disease by a genetic mutation affecting nerve cells.

2. The nurse determines that a client with cirrhosis is experiencing peripheral neuropathy. What action should the nurse take?

Correct answer: A

Rationale: Protecting the client's feet from injury is essential when managing peripheral neuropathy in a client with cirrhosis. Peripheral neuropathy can result in reduced sensation, increasing the risk of injury. Applying a heating pad or keeping the client's feet elevated would not address the primary concern of preventing injury. Assessing the feet and legs for jaundice is important for monitoring liver function, but it is not directly related to managing peripheral neuropathy in this case.

3. A client on bedrest refuses to wear the prescribed pneumatic compression devices after surgery. Which action should the PN implement in response to the client's refusal?

Correct answer: A

Rationale: The correct action for the PN to implement when a client refuses pneumatic compression devices is to emphasize the importance of active foot flexion. Active foot flexion exercises can help prevent deep vein thrombosis (DVT) in clients who are not using the compression devices. Encouraging some form of circulation-promoting activity is crucial to reduce the risks associated with immobility. Checking the surgical dressing (Choice B) is important but not the immediate action to address the refusal of compression devices. Completing an incident report (Choice C) is not necessary in this situation as the client's refusal is not an incident. Explaining the use of an incentive spirometer (Choice D) is not directly related to addressing the refusal of compression devices for DVT prevention.

4. A client with blood type AB negative delivers a newborn with blood type A positive. The cord blood reveals a positive indirect Coombs test. Which is the implication of this finding?

Correct answer: C

Rationale: A positive indirect Coombs test indicates that the mother's Rh antibodies have crossed the placenta and are present in the neonatal blood, which can lead to hemolytic disease of the newborn. This finding necessitates close monitoring and potential intervention. Choice A is incorrect because a positive Coombs test does not indicate an infectious blood-borne disease. Choice B is incorrect as phototherapy for physiologic jaundice is not related to a positive Coombs test result. Choice D is incorrect because a positive Coombs test does not indicate that the mother no longer needs Rho immune globulin injections; in fact, it suggests a need for further management to prevent hemolytic disease of the newborn.

5. How does the home care nurse determine that a 78-year-old client is unable to remain in his current residence alone?

Correct answer: C

Rationale: The correct answer is assessing the home environment. This process is vital in evaluating whether an elderly client can safely live independently. Factors like safety hazards and the client's ability to handle daily activities are considered during this assessment. Choices A, B, and D are incorrect because determining the client's ability to remain in his residence alone relies more on evaluating the home environment for safety and suitability rather than the client's goals, learning level, or distractions in the home.

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