EDAIC - European Diploma in Anesthesiology and Intensive Care Pharmacokinetics and Pharmacodynamics Questions and Answers

Question 1

A 68-year-old patient with Child-Pugh Class C liver cirrhosis is anesthetized for a TIPS procedure.
Fentanyl, a highly protein-bound opioid with a high hepatic extraction ratio, is administered.
Which pharmacokinetic changes are most significant in this patient compared to a healthy individual?

Accepted Answer

Increased free drug fraction and decreased hepatic clearance.

Answer

Decreased volume of distribution and increased hepatic clearance.

Answer

Increased plasma protein binding and a higher first-pass metabolism.

Answer

Decreased drug potency at the mu-opioid receptor.

Question 2

Which of the following statements accurately describes the effect of a non-competitive antagonist on an agonist's dose-response curve?

Accepted Answer

A depression of the maximal effect (Emax), which cannot be overcome by increasing the agonist concentration.

Answer

A parallel rightward shift, with no change in maximal effect.

Answer

An increase in the agonist's potency (lower EC50).

Answer

A parallel leftward shift, with an increase in maximal effect.

Question 3

A 55-year-old patient with combined severe renal and hepatic failure requires a continuous opioid infusion for sedation in the ICU. Which of the following opioids would provide the most predictable and rapid offset of effect upon discontinuation of the infusion?

Accepted Answer

Remifentanil

Answer

Fentanyl

Answer

Morphine

Answer

Hydromorphone

Question 4

A 70-year-old patient with anuria due to end-stage renal disease requires neuromuscular blockade for an emergency laparotomy. Which of the following neuromuscular blocking agents would have the most significantly prolonged duration of action?

Accepted Answer

Pancuronium

Answer

Atracurium

Answer

Succinylcholine

Answer

Cisatracurium

Question 5

The 'context-sensitive half-time' is a critical pharmacokinetic concept for predicting recovery after an intravenous drug infusion. It is defined as the time required for:

Accepted Answer

the plasma drug concentration to decrease by 50% after stopping an infusion of a specific duration.

Answer

50% of the total drug dose to be eliminated from the body.

Answer

the drug concentration at the effect site to reach 50% of its peak.

Answer

the drug to be completely metabolized by the liver, independent of infusion time.

Question 6

In pharmacodynamics, Drug X has an EC50 of 2 mg, while Drug Y has an EC50 of 10 mg. Both drugs are full agonists at the same receptor and can produce the same maximal analgesic effect. Which of the following statements correctly compares the two drugs?

Accepted Answer

Drug X is more potent, but they have equal efficacy.

Answer

Drug X and Drug Y have equal potency.

Answer

Drug Y is more efficacious than Drug X.

Answer

Drug X is more efficacious and more potent than Drug Y.