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. At 1200, the practical nurse learns that a client's 0900 dose of an anticonvulsant was not given. The next scheduled dose is at 2100. Which action should the PN take?

Correct answer: B

Rationale: Administering the missed dose as soon as possible is crucial in this situation. Missing an anticonvulsant dose can lead to breakthrough seizures, which are harmful to the client. Administering the missed dose promptly helps maintain the therapeutic level of the medication and reduces the risk of seizure activity. Giving half the dose may not provide adequate protection against seizures. Delaying the dose until the next scheduled time increases the time the client is without the medication, potentially increasing the risk of seizures. Withholding the missed dose unless seizure activity occurs is not recommended, as prevention is key in managing anticonvulsant therapy.

3. 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.

4. A client post-thoracotomy is complaining of severe pain with deep breathing and coughing. What should the nurse encourage the client to do to manage the pain and prevent respiratory complications?

Correct answer: A

Rationale: Splinting the chest with a pillow helps manage pain during deep breathing and coughing, which is essential to prevent respiratory complications such as atelectasis or pneumonia after thoracic surgery. Holding a pillow against the chest while coughing (splinting) supports the incision site and reduces the pain associated with deep breathing and coughing. Encouraging shallow breaths (Choice B) can lead to respiratory complications due to inadequate lung expansion. Increasing pain medication (Choice C) should be done based on healthcare provider orders and not solely for this situation. Avoiding deep breathing exercises (Choice D) can worsen respiratory function and increase the risk of complications.

5. What is the priority intervention for a patient experiencing an acute asthma attack?

Correct answer: A

Rationale: Administering a bronchodilator is the priority intervention in an acute asthma attack. Bronchodilators help to quickly open the airways, relieve bronchospasm, and improve breathing. Encouraging the patient to drink fluids may be beneficial for other conditions but is not the priority in an acute asthma attack. Applying a high-flow oxygen mask may be necessary in severe cases of respiratory distress but is not the initial priority when managing an acute asthma attack. Performing chest physiotherapy is not indicated as the primary intervention for an acute asthma attack and may not address the immediate need to open the airways and improve breathing.

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