which disorder is characterized by demyelination of neurons in the central nervous system
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HESI LPN

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. A client post-splenectomy is at risk for infection. What is the most important preventive measure the nurse should emphasize during discharge teaching?

Correct answer: C

Rationale: The correct answer is C: 'Wash hands frequently and practice good hygiene.' After a splenectomy, the client is at an increased risk of infection due to the role of the spleen in the immune system. Maintaining good hand hygiene, such as frequent handwashing, is crucial to prevent infections. While taking prescribed antibiotics as directed (Choice A) is important if prescribed, it is not the most crucial preventive measure in this scenario. Avoiding crowded places and sick people (Choice B) can help reduce the risk of exposure to pathogens but may not always be feasible. Keeping the surgical site clean and dry (Choice D) is important for wound care but is not the primary preventive measure to protect against infections in a post-splenectomy client.

3. Which of the following is the best method for confirming nasogastric tube placement?

Correct answer: B

Rationale: Checking the pH of the aspirate is the most reliable method to confirm nasogastric tube placement as it provides direct evidence of the tube's location in the stomach. When the pH is acidic (pH < 5), it indicates that the tube is correctly placed in the stomach. Auscultating over the stomach while injecting air may not always be accurate, as the sound can be misleading due to various factors. Observing the patient’s response during feeding is not a definitive method for confirming tube placement, as it can be influenced by other factors. Measuring the external length of the tube does not ensure correct placement within the GI tract and can be affected by external factors like patient anatomy.

4. An adult female client with type 1 diabetes mellitus is receiving NPH insulin 35 units in the morning. Which finding should the PN document as evidence that the amount of insulin is inadequate?

Correct answer: C

Rationale: The correct answer is C. High evening glucose levels indicate that the morning dose of NPH insulin may be insufficient to control blood sugar throughout the day. Choice A is incorrect as cold and numb feet are more indicative of a circulation issue rather than an insulin inadequacy. Choice B suggests a wound infection rather than inadequate insulin. Choice D, nausea in the morning, may be due to other causes and does not necessarily indicate inadequate insulin dosage.

5. When caring for a patient with a fresh tracheostomy, what is the nurse’s first priority?

Correct answer: B

Rationale: The correct answer is B: Ensuring the tracheostomy ties are secure. This is the nurse's first priority because it is critical to prevent accidental decannulation, which could compromise the patient’s airway. Providing humidified oxygen, suctioning the tracheostomy tube, and monitoring for signs of infection are important aspects of care but ensuring the tracheostomy ties' security takes precedence to maintain the patient's airway.

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