Question 1

How many milligrams of lidocaine does 1 mL of 2% lidocaine contain?

Accepted Answer

One mL of 2% lidocaine contains 20 mg of drug.

Question 2

Which of the following would be the LONGEST lasting for inferior alveolar nerve block (IANB) anesthesia?

Accepted Answer

Prilocaine has the longest duration of action for infe rior alveolar nerve block ( IANB ) (60 - 90 minutes pupal anesthesia).

Question 3

The maximum safe dose of carbocaine is 300 mg. How many cartridges of a 2% solution can be injected so as not to exceed the maximum?

Accepted Answer

Eight cartridges of carbocaine 2% can be injected before reaching the maximum recommended dose of 300 mg.

Question 4

Repolarization of the nerve after stimulation is primarily caused by:

Accepted Answer

Repolarization of the nerve after stimulation is primarily caused by active transport of sodium ( Na ) out of the cell.

Question 5

The amount of anesthetic in a cartridge of 4% prilocaine is

Accepted Answer

The amount of anesthetic drug in a cartridge of 4% prilocaine is 72 mg.

Question 6

Why do local anesthetics NOT work well in infected tissues?

Accepted Answer

All of the options are correct.

Question 7

Tissues with higher pH will cause:

Accepted Answer

Tissues with high pH will cause rapid disassociation of the anesthetic drug.

Question 8

The two stages of an action potential are:

Accepted Answer

The two stages of an action po tential are depolarization and repolarization.

Question 9

The maximum safe dose of 2% carbocaine for a normal adult client is:

Accepted Answer

The maximum recommended dose of carbocaine 2% for a normal adult client is 8.3 cartridges.

Question 10

All of the statements concerning local anesthetic cartridges are true EXCEPT one. Which one is the EXCEPTION?

Accepted Answer

Local anesthetic cartridges should not be frozen or used beyond the expiration date.

Question 11

Local anesthetic agents prevent depolarization by:

Accepted Answer

Local anesthetic agents prevent depolarization by preventing transfer of Na ions from the exterior of the nerve to the interior.

Question 12

All of the statements concerning local anesthetic needles are true EXCEPT one. Which one is the EXCEPTION?

Accepted Answer

Disposable needles may become dull after one use.

Question 13

Lidocaine is metabolized primarily in the:

Accepted Answer

Lidocaine is metabolized in the liver.

Question 14

It takes 2 minutes to deliver 1.8 mL of anesthetic using the Wand fast flow rate; this is the ideal flow rate for a traditional injection according to Malamed (2007).

Accepted Answer

It takes 1 minute to deliver 1.8 cc of anesthetic using the Wand fast flow rate; 2 mi nutes is the ideal flow rate for a traditional injection , according to Malamed (2007).

Question 15

Complete the sentence with the MOST accurate phrase. Local anesthetics______________________.

Accepted Answer

Local anesthetic agents disassociate in the tissues liberating freebase , which can diffuse through the nerve membrane.

Question 16

The purpose of aspirating before injecting a local anesthetic solution is to prevent:

Accepted Answer

The purpose of aspirating before injecting is to prevent intra vascular injections.

Question 17

How does a nerve conduct an impulse?

Accepted Answer

A nerve conducts an impulse by sequential cell membrane depolarization from node to node.

Question 18

Once the minimal threshold stimulus has been reached, the impulse will travel the entire length of the fiber without stimulation. This explains:

Accepted Answer

The all-or- none law states: Once the minimal threshold stimulus has been reached, the impulse will travel the entire length of the fiber without stimulation.

Question 19

All of the following statements about local anesthesia are true EXCEPT for one. Which one is the EXCEPTION?

Accepted Answer

Children cannot tolerate adult doses of local anesthetics. MRD should be calculated by body weight , as overdose is a real concern in children.

Question 20

The gauge of a dental needle MOST recommended for intraoral injections with high risk of aspiration is:

Accepted Answer

The gauge most recommended for intraoral injections with a high risk of positive aspiration is 25 gauge.

Quiz 18: Management of Pain and Anxiety