Nokea
In which of the following patients would a nurse expect to see an alteration in drug metabolism?
- A. A 35-year-old female with cervical cancer
- B. A 41-year-old male with kidney stones
- C. A 50-year-old male with cirrhosis of the liver
- D. A 62-year-old female in acute renal failure
Correct Answer: C
Rationale: The liver is the most important site of drug metabolism. If the liver is not functioning effectively, as in patients with cirrhosis, drugs will not be metabolized normally and toxic levels could develop. In cirrhosis patients the drug dosage will need to be altered to ensure normal levels in the body.
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All of the following statements about efficacy and potency are true EXCEPT:
- A. Efficacy is usually a more important clinical consideration than potency
- B. Efficacy is the maximum effect of a drug
- C. Potency is a comparative measure, refers to the different doses of two drugs that are needed to produce the same effect
- D. The ED50 is a measure of drug's efficacy
Correct Answer: D
Rationale: ED50 measures potency (dose for 50% effect), not efficacy (maximal effect).
A man is given a drug to reduce thyroid gland size and vascularity before surgical thyroidectomy. Which mechanism is responsible for its use in this setting?
- A. inhibition of the sodium/iodide symporter
- B. inhibition of thyroperoxidase
- C. inhibition of TSH secretion
- D. inhibition of thyroid hormone release
Correct Answer: D
Rationale: Inhibition of thyroid hormone release (e.g., by iodides) reduces gland size and vascularity pre-surgery.
When the costs of a specific treatment or intervention are calculated and then compared with the dollar value of the benefit received it is referred to as:
- A. Cost-minimization analysis
- B. Cost-of-illness analysis
- C. Cost-effectiveness analysis
- D. Cost-benefit analysis
Correct Answer: D
Rationale: Cost-benefit analysis quantifies both costs and benefits in monetary terms.
Which of the following are poorly perfused tissues?
- A. Heart
- B. Brain
- C. Liver
- D. Kidneys
Correct Answer: B
Rationale: This appears to be a trick question; heart, brain, liver, and kidneys are well-perfused. Assuming intent was poorly perfused, none fit, but B (Brain) is least correct here as it's well-perfused.
Which of the following antiarrhythmic agents has the longest plasma half-life?
- A. Amiodarone
- B. Disopyramide
- C. Quinidine
- D. Disopyramide
Correct Answer: A
Rationale: Amiodarone has a half-life of weeks due to extensive tissue distribution.