Deck 7: Dose Calculations for Local Anesthetic Solutions

Question 1

Match the following:

-Articaine

A) MRD 90 mg
B) MRD 0.04 mg
C) 3.2 mg/lb
D) 3.6 mg/lb
E) MRD 500 mg
F) 54 mg/cartridge
G) Based on child's weight
H) 1.8 ml
I) MRD 1.0 mg
J) Based on child's age

Answer 1

3.2 mg/lb

Question 2

Match the following:

-Bupivacaine

A) MRD 90 mg
B) MRD 0.04 mg
C) 3.2 mg/lb
D) 3.6 mg/lb
E) MRD 500 mg
F) 54 mg/cartridge
G) Based on child's weight
H) 1.8 ml
I) MRD 1.0 mg
J) Based on child's age

Answer 2

MRD 90 mg

Question 3

Match the following:

-Cardiac dose

A) MRD 90 mg
B) MRD 0.04 mg
C) 3.2 mg/lb
D) 3.6 mg/lb
E) MRD 500 mg
F) 54 mg/cartridge
G) Based on child's weight
H) 1.8 ml
I) MRD 1.0 mg
J) Based on child's age

Answer 3

MRD 0.04 mg

Question 4

Match the following:

-Cartridge volume

A) MRD 90 mg
B) MRD 0.04 mg
C) 3.2 mg/lb
D) 3.6 mg/lb
E) MRD 500 mg
F) 54 mg/cartridge
G) Based on child's weight
H) 1.8 ml
I) MRD 1.0 mg
J) Based on child's age

Question 5

Match the following:

-Clark's rule

A) MRD 90 mg
B) MRD 0.04 mg
C) 3.2 mg/lb
D) 3.6 mg/lb
E) MRD 500 mg
F) 54 mg/cartridge
G) Based on child's weight
H) 1.8 ml
I) MRD 1.0 mg
J) Based on child's age

Question 6

Match the following:

-Levonordefrin

A) MRD 90 mg
B) MRD 0.04 mg
C) 3.2 mg/lb
D) 3.6 mg/lb
E) MRD 500 mg
F) 54 mg/cartridge
G) Based on child's weight
H) 1.8 ml
I) MRD 1.0 mg
J) Based on child's age

Question 7

Match the following:

-Lidocaine

A) MRD 90 mg
B) MRD 0.04 mg
C) 3.2 mg/lb
D) 3.6 mg/lb
E) MRD 500 mg
F) 54 mg/cartridge
G) Based on child's weight
H) 1.8 ml
I) MRD 1.0 mg
J) Based on child's age

Question 8

Match the following:

-Mepivacaine

A) MRD 90 mg
B) MRD 0.04 mg
C) 3.2 mg/lb
D) 3.6 mg/lb
E) MRD 500 mg
F) 54 mg/cartridge
G) Based on child's weight
H) 1.8 ml
I) MRD 1.0 mg
J) Based on child's age

Question 9

Match the following:

-Prilocaine

A) MRD 90 mg
B) MRD 0.04 mg
C) 3.2 mg/lb
D) 3.6 mg/lb
E) MRD 500 mg
F) 54 mg/cartridge
G) Based on child's weight
H) 1.8 ml
I) MRD 1.0 mg
J) Based on child's age

Question 10

Match the following:

-Young's rule

A) MRD 90 mg
B) MRD 0.04 mg
C) 3.2 mg/lb
D) 3.6 mg/lb
E) MRD 500 mg
F) 54 mg/cartridge
G) Based on child's weight
H) 1.8 ml
I) MRD 1.0 mg
J) Based on child's age

Question 11

The maximum recommended dose for each solution is dependent on the drug that limits the total volumes that may be delivered.

Question 12

In solutions containing both a local anesthetic and a vasoconstrictor drug, the maximum recommended dose of the local anesthetic is usually the limiting drug.

Question 13

The maximum safe dose of 1:50,000 epinephrine per appointment for a healthy adult is 0.2 mg or 5.5 cartridges.

Question 14

At a concentration of 4%, the amount of drug in a 1.8 ml cartridge is 7.2 mg.

Question 15

At a concentration of 0.5%, the amount of drug in a 1.8 ml cartridge is 9 mg.

Question 16

To calculate the milligrams of drug delivered, multiply the total number of cartridges by the total milligrams of drug in each cartridge.

Question 17

When two different drugs are injected, the total of the MRDs for both drugs is the maximum number of milligrams of drugs the patient may receive.

Question 18

Calculations of maximum safe doses for vasoconstrictors are determined by mg/lb or mg/kg.

Question 19

The maximum safe dose of 1:200,000 epinephrine per appointment for a patient with ischemic heart disease is 0.4 mg or 1.1 cartridges.

Question 20

Clark's rule for determining pediatric drug doses is based on a child's weight divided by 150 to get the approximate fraction of the adult dose.

Question 21

The maximum recommended dose per appointment for bupivacaine is ________.

Question 22

The maximum recommended dose per appointment for lidocaine is ________.

Question 23

The maximum mg/lb of mepivacaine per appointment is ________.

Question 24

The maximum mg/lb of prilocaine per appointment is ________.

Question 25

A 10% solution contains one tenth of a milligram per milliliter or ________ mg/ml.

Question 26

A 2% solution of lidocaine contains ________ mg/ml.

Question 27

A 2% solution of lidocaine contains ________ mg/cartridge.

Question 28

A 3% solution of mepivacaine contains ________ mg/ml.

Question 29

A 3% solution of mepivacaine contains ________ mg/cartridge.

Question 30

Ralph weighs 175 lb. He has received 72 mg of 2% lidocaine. Ralph can receive a maximum of ________ mg additional lidocaine.

Question 31

Susan is a healthy patient and weighs 130 lb. She has received 54 mg of 3% mepivacaine. She could receive a maximum of _________ mg of 4% prilocaine, 1:200,000 epinephrine.

Question 32

The MRD for bupivacaine is:

A) 200 mg
B) 90 mg
C) 300 mg
D) 500 mg

Question 33

Which of the following information for MRD is not correct?

A) Bupivacaine = 90 mg
B) Lidocaine = 500 mg
C) Mepivacaine = 300 mg
D) Prilocaine = 600 mg

Question 34

What is the MRD of vasoconstrictor for 2% lidocaine, 1:100,000 epinephrine for a healthy patient?

A) 0.02 mg
B) 2.0 mg
C) 1.0 mg
D) 0.2 mg

Question 35

What is the MRD in cartridges for 4% prilocaine, 1:200,000 epinephrine for a healthy 150 pound patient?

A) 5
B) 6
C) 8
D) 11

Question 36

How many milligrams of epinephrine 1:50,000 are available in one cartridge?

A) 0.018 mg
B) 0.050 mg
C) 0.036 mg
D) 0.2 mg

Question 37

How many milligrams of epinephrine 1:200,000 are available in two cartridges?

A) 0.018
B) 0.18
C) 0.036
D) 0.016

Question 38

Which of the following pieces of information is not usually required in order to calculate safe doses for local anesthetics and vasoconstrictors?

A) Patient factors such as height, weight, and age
B) Standard cartridge volume and dilution percentages
C) Maximum recommended dose and patient weight
D) Concentration of drug and dilution percentages

Question 39

A 150-pound patient has received two cartridges of 2% lidocaine, 1:100,000 epinephrine. How many additional cartridges with the same drugs can be administered before reaching the MRD?

A) 5
B) 6
C) 9
D) 11

Question 40

A 120-pound patient has received three cartridges of 4% prilocaine, 1:200:000 epinephrine. How many more milligrams of prilocaine can this patient receive before reaching the MRD?

A) 72 mg
B) 216 mg
C) 432 mg
D) 600 mg

Question 41

A healthy 160-pound patient has received three cartridges of 2% lidocaine, 1:50,000 epinephrine during an oral surgical procedure. How many more cartridges with the same drug could this patient receive before reaching the MRD?

A) 2
B) 5
C) 8
D) 10

Question 42

A patient has received four cartridges of 4% articaine, 1:200,000 epinephrine. How many milligrams of vasoconstrictor has the patient received?

A) 0.018
B) 0.036
C) 0.072
D) 0.36

Question 43

A 180-pound patient has received three cartridges of 2% lidocaine, 1:100,000 epinephrine. How many additional milligrams of 4% articaine, 1:200,000 epinephrine can be administered before reaching the MRD?

A) 72 mg
B) 192 mg
C) 228 mg
D) 392 mg

Question 44

A 120-pound patient has received 2 cartridges of 2% mepivacaine, 1:20,000 and does not remain adequately numb during the procedure. How many additional cartridges of 2% lidocaine, 1:100,000 epinephrine may the patient receive before reaching the MRD?

A) 6
B) 9
C) 11
D) 13

Question 45

What is the MRD of levonordefrin for a 210 pound male patient with ischemic heart disease?

A) 0.02 mg
B) 0.2 mg
C) 0.04 mg
D) 0.4 mg

Question 46

A patient with cardiovascular disease has received one cartridge of 2% lidocaine, 1:100:000 epinephrine. How many milligrams of vasoconstrictor has this patient received? How many additional milligrams of vasoconstrictor can the patient receive before reaching MRD?

A) 0.018 mg received; 0.022 mg additional
B) 0.009 mg received; 0.391 mg additional
C) 0.36 mg received; 0.4 mg additional
D) 0.18 mg received; 0.22 mg additional

Question 47

A patient with cardiovascular disease has received two cartridges of 4% articaine, 1:200:000 epinephrine. How many milligrams of vasoconstrictor has this patient received? How many additional cartridges of the same drug solution can the patient receive?

A) 0.009 mg received; two additional cartridges
B) 0.018 mg received; two additional cartridges
C) 0.18 mg received; no additional cartridges
D) 0.036 mg received; no additional cartridges

Question 48

Using Clark's rule, calculate the milligrams of 2% lidocaine an 8-year old, 60 pound child can receive before reaching MRD.

A) 60 mg
B) 120 mg
C) 200 mg
D) 300 mg

Question 49

Using Clark's rule, a 12-year old, 90 pound child has received two cartridges of 2% lidocaine. How many more cartridges of lidocaine can this child receive before reaching MRD?

A) 3
B) 6
C) 7
D) 8

Question 50

Using Clark's rule, calculate the maximum number of milligrams of 3% mepivacaine a 5-year old, 40-pound child can receive before reaching the MRD?

A) 40 mg
B) 80 mg
C) 106 mg
D) 117 mg

Question 51

Using Young's rule, calculate the mg of 2% lidocaine a 10-year old, 60-pound child can receive before reaching the MRD?

A) 125 mg
B) 136 mg
C) 200 mg
D) 227 mg

Question 52

What is the MRD of 4% prilocaine plain for a healthy 205 pound male patient?

Question 53

What factors are needed to calculate the local anesthetic drug dose delivered for a given patient?

Question 54

A 140-pound patient received 144 mg of 2% lidocaine plain. How many more milligrams of the same drug can the patient receive without exceeding the MRD? Provide mathematical formulas required to calculate the correct answer.

Question 55

A 180-pound patient received 108 mg of 3% mepivicaine. How many cartridges were used? Provide mathematical formulas required to calculate the correct answer.

Question 56

A 120-pound patient received 108 mg of 2% lidocaine. How many mg of 4% articaine can this patient receive? Provide mathematical formulas to calculate the correct answer.

Question 57

Complete the missing information in the table below.