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. When administering IV fluids to a client with a history of congestive heart failure (CHF), what is the nurse's primary concern?

Correct answer: A

Rationale: The primary concern when administering IV fluids to a client with a history of congestive heart failure (CHF) is monitoring for signs of fluid overload. Clients with CHF are particularly vulnerable to fluid overload, which can exacerbate their condition. Signs of fluid overload include edema and difficulty breathing. Therefore, the nurse must closely monitor these signs to prevent worsening of the client's condition. Choices B, C, and D are incorrect because while ensuring hydration, preventing electrolyte imbalances, and maintaining the prescribed rate of fluid administration are important, they are secondary concerns compared to the critical task of monitoring for fluid overload in a client with CHF.

4. While assessing an older male client who takes psychotropic medications, the nurse observes uncontrollable hand movements and excessive blinking. Which information in the client's medical record should the nurse review?

Correct answer: C

Rationale: The symptoms of uncontrollable hand movements and excessive blinking are indicative of tardive dyskinesia, a possible side effect of long-term use of psychotropic medications. Reviewing the screening for tardive dyskinesia is crucial to assess if these symptoms are related to the medication. Option A, the prescription for lorazepam, is less relevant as the focus should be on potential side effects rather than the specific medication. Option B, history of Parkinson's disease, is not directly related to the observed symptoms, which are more likely linked to medication side effects. Option D, recent urine drug screen report, is not as pertinent in this context compared to reviewing the screening for tardive dyskinesia.

5. During an inspection of a client's fingernails, the nurse notices a suspected abnormality in the shape and character of the nails. Which finding should the nurse document?

Correct answer: A

Rationale: Clubbed nails are a significant finding in clients with chronic hypoxia or lung disease. This abnormality is characterized by an increased curvature of the nails and softening of the nail bed. It can indicate underlying health conditions such as respiratory or cardiovascular issues. Splinter hemorrhages (B) are small areas of bleeding under the nails, typically associated with infective endocarditis. Longitudinal ridges (C) are often a normal age-related change in the nails. Koilonychia or spoon nails (D) present as a concave shape of the nails and are commonly seen in clients with iron deficiency anemia or hemochromatosis. Therefore, documenting clubbed nails is the most relevant abnormality to report and investigate further.

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