LA Canvas Quiz Questions Flashcards
How are Schwann cells and nodes of Ranvier related?
A. Schwann cells are nodes of Ranvier
B. Gaps between Scwann cells are called nodes of Ranvier
C. They are not related
D. At the nodes of Ranvier, Schwann cells are one layer thick
B. Gaps between Scwann cells are called nodes of Ranvier
Local Anesthesia works by a strong affinity to protein receptor sites compared to Ca+ ions with protein channels. Local Anesthesia acts as gate to cause:
A. depolarization
B. repolarization
C. resting state
D. impulse extinction
D. impulse extinction
Mantle bundles will be anesthetized more easily and rapidly than core bundles. In clinical practice this will mean that anterior teeth and the soft tissues of the chin and lip will be anesthetized first and will last longer when administering an Inferior Alveolar Nerve Block.
A. The first statement is false but the application is accurate.
B. The first statement is true but the application is inaccurate.
C. Both statements are true.
D. Both statements are false.
B. The first statement is true but the application is inaccurate.
Which sequence best describes the events for successful impulse generation?
A. Stimulus, firing threshold, rapid depolarization, slow depolarization, resting
B. Resting state, stimulus, slow depolarization, rapid depolarization, firing threshold
C. Stimulus, slow depolarization, firing threshold, rapid depolarization, recovery.
D. Resting state, stimulus, slow depolarization, rapid depolarization, slow depolarization
C. Stimulus, slow depolarization, firing threshold, rapid depolarization, recovery.
What is the process whereby impulses are more rapidly conducted along myelinated nerves that is characterized by the impulse “jumping”over Schwann cells from node to node.
A. impulse extinction
B. rapid depolarization
C. rapid repolarization
D. saltatory induction
D. saltatory induction
The definition of the maximum recommended dose (MRD) of a drug best fits which one of the following definitions?
A. A safe dose to administer in all situations.
B. A dose that a 150lb individual can have
C. A dose that cannot be exceeded under any circumstance
D. A safe guideline when administering local anesthetic drugs
D. A safe guideline when administering local anesthetic drugs
Which part of the local anesthetic molecule determines the classification of the drug as an ester or amide?
A. Lipophilic portion
B. Intermediate chain
C. Hydrophilic portion
D. Caine linkage
B. Intermediate chain
Which part of the local anesthetic molecule is responsible for binding to the receptor site inside the nerve membrane, thereby preventing depolarization?
A. Calcium ion
B. Anesthetic cation
C. Anesthetic ion
D. Anesthetic free base
B. Anesthetic cation
Elimination half-life refers to which one of the following?
A. the time it takes for a drug to be half-metabolized
B. the time it takes for half of the drug to be out of the circulation
C. The time it takes for a drug to be out of half of the circulation
D. the time it takes for half of a drug to be out of the system
D. the time it takes for half of a drug to be out of the system
In comparing a 25-gauge needle with a 30-gauge needle, the 25 gauge needle:
- Has better aspiration.
- Breaks more easily.
- Is less comfortable than the 30 gauge.
- Has a smaller diameter.
- Has less needle deflection, making it more accurate in reaching the target area.
A. 2, 4, 5
B. 2, 3, 4
C. 1, 3, 5
D. 1 and 5
D. 1 and 5
Long needles are approximately ________ long
A. 12-22 mm
B. 20-22 mm
C. 30-36 mm
D. 40-46 mm
C. 30-36 mm
What substance is used as the preservative for epinephrine in local anesthetic cartridges?
A. Sodium bisulfite
B. Sodium hypochlorite
C. Methylparaben
D. Nitrogen
A. Sodium bisulfite
Which one of the following drugs is an absolute contraindication for patients with poorly controlled or uncontrolled hyperthyroidism?
A. Lidocaine
B. Bupivacaine
C. Epinephrine
D. Priolocaine
C. Epinephrine
Your patient has identified use of methamphetamines approximately 20 hours ago. Which of the following would be the most appropriate approach with regards to the use of local anesthetics?
A. Continue with the procedure since it has been over 12 hours.
B. Restrict the dose of vasoconstrictor to 20% of the standard dose.
C. Use only bupivacine as the local anesthetic agent
D. Consider postponing treatment for a full 24 hours post use of methamphetamine.
D. Consider postponing treatment for a full 24 hours post use of methamphetamine.
