LOCAL ANESTHESIA FINAL AND
NERB EXAM QUESTIONS AND
ANSWERS
Lipid solubility determines the ___________ of a local anesthetic. - Correct Answers -
Potency
When using an aspirating syringe, the harpoon engages with what? - Correct Answers -
Rubber stopper of the cartridge
EMLA is a topical anesthetic that contains which of the following local anesthetic
agents? - Correct Answers -2.5% Lidocaine and 2.5% Prilocaine
If the extracellular pH is acidic, as with an infection, there are insufficient free base local
anesthetic molecules available to cross the nerve sheath to provide profound local
anesthesia. - Correct Answers -True
When a syringe is reloaded with a second local anesthetic cartridge and a needle is
already in place, care must be taken to ensure that the needle penetrates the center of
the rubber latex diaphragm. An off center perforation can result in what? - Correct
Answers -lack of flow of anesthetic solution through the needle
Which of the following theories of the mode of action of local anesthetics states that
local anesthetics act by binding to specific receptors on the sodium channel eliminating
the permeability of the nerve membrane to sodium ions and preventing the conduction
of a nerve impulse? - Correct Answers -Specific Receptor Theory
According to research, 50-80% of dental fear and anxiety is based on experiences that
occurred during a patient's childhood or adolescence - Correct Answers -True
Saltatory conduction is a term that refers to _______________________. - Correct
Answers -Impulse conduction in myelinated nerves
, What is the reason for aspirating prior to delivering an injection? - Correct Answers -To
avoid an intravascular injection
Local anesthetics anesthetize an area of deposition by _____________________. -
Correct Answers -making the nerve membrane LESS permeable to Na+
The period during which a nerve cannot conduct an impulse just after completing an
impulse called the______________________. - Correct Answers -Absolute refractory
period
During depolarization, the nerve membrane increases in permeability to ________ ions
- Correct Answers -Sodium
In myelinated nerves, local anesthetic molecules must diffuse through the myelin sheath
to reach the nerve membrane in order to block the nerve impulse. - Correct Answers -
False
Most topical anesthetics are what classification? - Correct Answers -Esters
The pKa of a local anesthetic solution has the greatest influence on the anesthetic's
_____________. - Correct Answers -onset
Nerve conduction and impulse spread is faster on _______________ nerve fibers -
Correct Answers -myelinated
Which type of local anesthetic molecule passes through the nerve membrane into the
axoplasm? - Correct Answers -Uncharged free base (RN)
Which of the following concentrations of vasoconstrictor is recommended for maximum
control of
hemorrhage during surgery? - Correct Answers -1:50,000 epinephrine
Which of the following vasoconstrictors exhibits Beta 2 actions which predominate and
can lead to
vasodilation about six hours after a surgical procedure? - Correct Answers -epinephrine
Generic = Lidocaine - Correct Answers -Xylocaine
Inflammation exhibits which of the following effects on local anesthesia? - Correct
Answers -Decrease effectiveness due to a decrease in pH of inflamed tissue and
increased vascularity
The level of protein binding to local anesthetic molecules affects which of the following?
- Correct Answers -Duration of action
NERB EXAM QUESTIONS AND
ANSWERS
Lipid solubility determines the ___________ of a local anesthetic. - Correct Answers -
Potency
When using an aspirating syringe, the harpoon engages with what? - Correct Answers -
Rubber stopper of the cartridge
EMLA is a topical anesthetic that contains which of the following local anesthetic
agents? - Correct Answers -2.5% Lidocaine and 2.5% Prilocaine
If the extracellular pH is acidic, as with an infection, there are insufficient free base local
anesthetic molecules available to cross the nerve sheath to provide profound local
anesthesia. - Correct Answers -True
When a syringe is reloaded with a second local anesthetic cartridge and a needle is
already in place, care must be taken to ensure that the needle penetrates the center of
the rubber latex diaphragm. An off center perforation can result in what? - Correct
Answers -lack of flow of anesthetic solution through the needle
Which of the following theories of the mode of action of local anesthetics states that
local anesthetics act by binding to specific receptors on the sodium channel eliminating
the permeability of the nerve membrane to sodium ions and preventing the conduction
of a nerve impulse? - Correct Answers -Specific Receptor Theory
According to research, 50-80% of dental fear and anxiety is based on experiences that
occurred during a patient's childhood or adolescence - Correct Answers -True
Saltatory conduction is a term that refers to _______________________. - Correct
Answers -Impulse conduction in myelinated nerves
, What is the reason for aspirating prior to delivering an injection? - Correct Answers -To
avoid an intravascular injection
Local anesthetics anesthetize an area of deposition by _____________________. -
Correct Answers -making the nerve membrane LESS permeable to Na+
The period during which a nerve cannot conduct an impulse just after completing an
impulse called the______________________. - Correct Answers -Absolute refractory
period
During depolarization, the nerve membrane increases in permeability to ________ ions
- Correct Answers -Sodium
In myelinated nerves, local anesthetic molecules must diffuse through the myelin sheath
to reach the nerve membrane in order to block the nerve impulse. - Correct Answers -
False
Most topical anesthetics are what classification? - Correct Answers -Esters
The pKa of a local anesthetic solution has the greatest influence on the anesthetic's
_____________. - Correct Answers -onset
Nerve conduction and impulse spread is faster on _______________ nerve fibers -
Correct Answers -myelinated
Which type of local anesthetic molecule passes through the nerve membrane into the
axoplasm? - Correct Answers -Uncharged free base (RN)
Which of the following concentrations of vasoconstrictor is recommended for maximum
control of
hemorrhage during surgery? - Correct Answers -1:50,000 epinephrine
Which of the following vasoconstrictors exhibits Beta 2 actions which predominate and
can lead to
vasodilation about six hours after a surgical procedure? - Correct Answers -epinephrine
Generic = Lidocaine - Correct Answers -Xylocaine
Inflammation exhibits which of the following effects on local anesthesia? - Correct
Answers -Decrease effectiveness due to a decrease in pH of inflamed tissue and
increased vascularity
The level of protein binding to local anesthetic molecules affects which of the following?
- Correct Answers -Duration of action
