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LOCAL ANETHESIA (CDCA) PRACTICE EXAM QUESTIONS AND ANSWERS COMPLETE RATED A.
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LOCAL ANETHESIA (CDCA) PRACTICE EXAM QUESTIONS AND ANSWERS COMPLETE RATED A.
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LOCAL ANETHESIA (CDCA) PRACTICE EXAMQUESTIONS AND ANSWERS COMPLETE RATED
A.
1. If a patient received two cartridges of anesthetic, how much volume
did they receive?
o Correct Answer: 3.6 ml
o Explanation: Each standard cartridge contains 1.8 ml of solution.
Therefore, two cartridges equal 3.6 ml (1.8 ml x 2).
2. What is the probable cause if a patient experiences burning during
an injection?
o Correct Answer: Injected too fast
o Explanation: Injecting anesthetic too quickly can cause discomfort
or a burning sensation. Injecting slowly allows tissues to absorb the
solution more comfortably.
3. What causes difficulty achieving anesthesia in a patient with a
significant infection?
o Correct Answer: The pH balance of the infection creates an acidic
environment, preventing the local anesthetic from binding to nerve
receptors.
o Explanation: Infected tissue often has a lower pH, making it
harder for the anesthetic to penetrate and bind effectively to
nerves.
4. What likely caused a lesion on the lower lip that appeared the day
after a local anesthesia injection?
o Correct Answer: Self-injury
o Explanation: After anesthesia, patients sometimes unknowingly
bite or irritate numb areas, leading to self-inflicted injuries.
5. What is the volume of a single cartridge of local anesthetic?
, o Correct Answer: 1.8 ml
o Explanation: A standard cartridge of local anesthetic typically
contains 1.8 ml of solution.
6. What is the purpose of adding sodium bisulfite to anesthetic?
o Correct Answer: Preservative for vasoconstrictor
o Explanation: Sodium bisulfite is an antioxidant that helps prevent
the breakdown of vasoconstrictors, such as epinephrine, extending
their effectiveness.
7. What function does sodium chloride serve in an anesthetic solution?
o Correct Answer: Tissue compatibility
o Explanation: Sodium chloride makes the anesthetic solution
isotonic with body fluids, reducing irritation at the injection site.
8. For needle gauge, which lumen is the smallest?
o Correct Answer: 30 gauge
o Explanation: The higher the gauge number, the smaller the
needle diameter. Therefore, a 30-gauge needle is smaller than a
27- or 25-gauge needle.
9. What is a possible cause of pain when removing the needle?
o Correct Answer: Barbed needle
o Explanation: A barbed needle can occur when it contacts bone
during injection, causing pain as it is withdrawn.
10. Why should the needle not be inserted to the hub?
• Correct Answer: If the needle breaks, there would be nothing sticking
out to retrieve it.
• Explanation: Inserting the needle to the hub risks breakage deep within
tissues, making it harder to remove safely.
11. On which tissue is topical anesthetic least effective?
• Correct Answer: Keratinized, hard palate
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