LOCAL ANETHESIA (CDCA) MOCK BOARD EXAM
QUESTIONS FREQUENTLY TESTED WITH
EXPLANATION GUARANTEED PASS.
1. When a nerve is in its resting state, what is the concentration of ions?
o Correct Answer: K+ (potassium) is concentrated inside the cell.
o Explanation: In a resting nerve cell, potassium ions are primarily
found inside the cell, while sodium ions (Na+) are concentrated
outside the cell, creating the resting membrane potential.
2. Which of the following maintains the resting potential of a nerve
fiber?
o Correct Answer: The Na+ (sodium) pump.
o Explanation: The sodium-potassium pump actively moves sodium
out of the cell and potassium into the cell, maintaining the resting
membrane potential by keeping the concentration gradients of
these ions stable.
3. Which anesthetic(s) available in the U.S. is/are formulated with
epinephrine 1:200,000?
o Correct Answer: C and D (Prilocaine and Articaine).
o Explanation: Both Prilocaine and Articaine are available in
formulations with epinephrine 1:200,000, which helps prolong the
anesthetic effect and improve hemostasis.
4. Which anesthetic has the shortest duration when administering a
local anesthetic block?
o Correct Answer: Mepivacaine 3%.
o Explanation: Mepivacaine has a shorter duration of action
compared to other local anesthetics, especially when used at a
higher concentration like 3%.
5. How many mg of levonordefrin are in 1 mL of solution?
, o Correct Answer: 0.05 mg/mL.
o Explanation: Levonordefrin is a vasoconstrictor commonly used in
local anesthetic solutions, and it is present at a concentration of
0.05 mg per mL.
6. How much epinephrine does a 1:200,000 dilution contain compared
with a 1:100,000 dilution?
o Correct Answer: Half the amount.
o Explanation: A 1:200,000 dilution contains half the amount of
epinephrine as a 1:100,000 dilution, making it a less potent
vasoconstrictor.
7. What is the cardiac dose for epinephrine?
o Correct Answer: 0.04 mg.
o Explanation: For patients with cardiovascular issues, the
recommended maximum dose of epinephrine is 0.04 mg to avoid
potential complications.
8. How many cartridges could a patient safely receive if administering
a 1:200,000 epinephrine dilution?
o Correct Answer: 4.4 cartridges.
o Explanation: Based on the cardiac dose limit of 0.04 mg, a
patient can safely receive up to 4.4 cartridges of a 1:200,000
epinephrine dilution.
9. What is the primary reason that catecholamines are added to local
anesthetic solutions?
o Correct Answer: To decrease the risk of toxicity.
o Explanation: Catecholamines like epinephrine constrict blood
vessels, which helps to limit the spread of the anesthetic, reducing
the risk of systemic toxicity and prolonging the effect.
10. Sodium bicarbonate is added to local anesthetic solutions:
o Correct Answer: Only when a vasoconstrictor is added.
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