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. Prior to giving digoxin, the PN assesses that a 2-month-old infant's heart rate is 120 beats/minute. Based on this finding, what action should the PN take?

Correct answer: B

Rationale: A heart rate of 120 beats per minute is within the normal range for a 2-month-old infant. Therefore, it is safe to administer the digoxin and document the heart rate as part of routine care. Choice A is incorrect as withholding the medication is not necessary since the heart rate is normal. Choice C is incorrect as there is no need to delay the administration until the next scheduled dose when the heart rate is within the normal range. Choice D is incorrect as the primary nurse is not needed to administer the medication since the heart rate is normal and falls within the safe range for administration.

3. Which of the following is a common side effect of opioid analgesics that the nurse should monitor for in patients?

Correct answer: C

Rationale: Constipation is a common side effect of opioid analgesics due to the slowing of gastrointestinal motility. Opioids bind to receptors in the gastrointestinal tract, leading to decreased peristalsis and increased water absorption, resulting in constipation. Monitoring for constipation is crucial to prevent discomfort or complications like bowel obstruction. Diarrhea (Choice A) is not a common side effect of opioid analgesics. Hypertension (Choice B) and Bradycardia (Choice D) are not typically associated with opioid use.

4. What is the best thing to say to a patient scheduled for cataract surgery who is concerned that the physician works on the correct eye?

Correct answer: D

Rationale: The best response reassures the patient by explaining the process of verifying and marking the correct eye, a safety measure to prevent wrong-site surgery, directly addressing the patient’s concern. Choice A is close but implies the ID bracelet alone determines the correct eye, missing the verification process. Choice B talks about confirmation but lacks details about marking the correct eye. Choice C mentions the surgeon's record but does not specify the direct verification and marking process, unlike Choice D.

5. After administering pantoprazole to a client with gastroesophageal reflux disease (GERD), which statement by the client indicates to the nurse that the medication is producing the desired effect?

Correct answer: A

Rationale: The correct answer is A. Pantoprazole reduces stomach acid production, thus preventing the occurrence of heartburn after meals, which is a common symptom of GERD. Choice B is incorrect because an increased appetite and hunger are not indicators of the desired effect of pantoprazole. Choice C is unrelated to the medication's effect on GERD symptoms. Choice D is also incorrect because the absence of difficulty swallowing is not a specific indicator of pantoprazole's effectiveness in treating GERD.

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