ATI RN
Central Nervous System Stimulants and Related Drugs NCLEX Style Questions Questions
Question 1 of 5
Which of the following variables most likely caused the decrease in MAC in this case?
Correct Answer: B
Rationale: The decrease in MAC in this case can be attributed to the use of two anesthetics, nitrous oxide and sevoflurane. When two anesthetics are used together, their combined effect can lead to a lower MAC requirement for surgical anesthesia. This phenomenon is known as MAC sparing. In this case, the combination of nitrous oxide and sevoflurane resulted in a lower total MAC requirement of 0.7, compared to the usual 1.3 MAC in most patients. Therefore, the use of two anesthetics is the most likely variable that caused the decrease in MAC in this case.
Question 2 of 5
A physician has a choice in benzodiazepines to prescribe for patients. A particular patient (a 53-year-old man with anxiety) has a difficult time with compliance to medications. The physician is concerned about the patient going into withdrawal because of abrupt discontinuation of the antianxiety medication. Which of the following medications would have the least severe withdrawal reaction?
Correct Answer: A
Rationale: Diazepam has a long half-life, which reduces the risk of severe withdrawal symptoms compared to shorter-acting benzodiazepines like triazolam.
Question 3 of 5
Which of the following statements concerning morphine and hydromorphone is true?
Correct Answer: D
Rationale: Hydromorphone is more potent than morphine because it requires a lower dose (smaller ED50) to produce the same analgesic effect.
Question 4 of 5
Hyperthyroidism can be treated by the following EXCEPT:
Correct Answer: A
Rationale: Carbimazole (choice A) and Propylthiouracil (choice D) treat hyperthyroidism by inhibiting thyroid hormone synthesis, Propranolol (choice C) manages symptoms. Carbamazepine (choice B), an anticonvulsant, is unrelated, making it the exception. This clarifies antithyroid therapy.
Question 5 of 5
A 72-year-old man is brought to his physician by his son. The son complains that this patient has been becoming forgetful, confused, moody, and aggressive over the past few months. One drug that may be used to treat this patient's symptoms is donepezil. Which of the following describes an effect of donepezil?
Correct Answer: D
Rationale: Donepezil, a cholinesterase inhibitor, increases synaptic acetylcholine levels by preventing its breakdown, improving cognitive function in Alzheimer's disease.