Local Anesthetics MCQ Quiz | ANS & Peripheral NS

2. Which of the following is an ester-linked local anesthetic?

3. How are amide-linked local anesthetics, such as lidocaine, primarily metabolized?

4. Allergic reactions are more common with which class of local anesthetics?

5. The phenomenon where local anesthetics bind more effectively to sodium channels that are frequently opening is known as:

6. The onset of action of a local anesthetic is hastened by:

7. The most serious systemic toxicity with high plasma concentrations of local anesthetics like bupivacaine involves which two systems?

8. Why is epinephrine often added to local anesthetic solutions?

9. Local anesthetics tend to block different nerve fiber types at different rates. Which fibers are typically blocked first?

10. Which local anesthetic is known for its high potency, long duration of action, but also a significant risk of cardiotoxicity?

11. EMLA cream, a topical anesthetic, is a eutectic mixture of which two local anesthetics?

12. A unique adverse effect associated with high doses of prilocaine is:

13. Which is the only local anesthetic that possesses intrinsic vasoconstrictive properties?

14. The duration of action of a local anesthetic is most closely correlated with its:

15. Which property is most desirable for a local anesthetic used in spinal anesthesia to control the spread of the block?

16. What is the recommended first-line treatment for Local Anesthetic Systemic Toxicity (LAST), especially severe cardiotoxicity?

17. Which of these is almost exclusively used as a topical anesthetic due to its poor solubility and high risk of systemic toxicity if injected?

18. In an infected (acidic) tissue, the efficacy of a local anesthetic is reduced. This is primarily because:

19. Which local anesthetic was developed as a safer alternative to bupivacaine, with a similar profile but lower cardiotoxicity?

20. The metabolite responsible for hypersensitivity reactions to ester-type local anesthetics is:

21. Local anesthetics are formulated as acidic salts (e.g., lidocaine hydrochloride) to increase stability and water solubility. Why?

22. Which statement correctly describes the relationship between nerve fiber size and sensitivity to local anesthetic block?

23. Among the commonly used injectable local anesthetics, which one has the shortest duration of action without a vasoconstrictor?

24. What structural feature of Articaine contributes to its rapid metabolism and lower systemic toxicity risk?

25. Which of the following is typically an early sign of Central Nervous System (CNS) toxicity from local anesthetics?