Pharmacology of local anesthesia and vasoconstrictor l Oral and maxillofacial surgery MCQs for dental students
MCQs in oral surgery part pharmacology of local anesthesia and vasoconstrictor
1. Which of
the following is most commonly used vasoconstrictor in present day practice?
A. Dopamine
B. Felypressin
C. Adrenaline
D. Noradrenaline
2. The
standard American cartridges contain:
A. 1ml of the
anesthetic solution
B. 1.5ml of
the anesthetic solution
C. 1.8ml of
the anesthetic solution
D. 2 ml of the anesthetic
solution
3. A solution
containing adrenaline as 1:100,000, contains how many milligrams of adrenaline
per ml?
A. 0.0001 mg/ml
B. 0.001 mg/ml
C. 0.01 mg/ml
D. 0.1 mg /ml
4. Which of the
followings is used as a reducing agent in local anesthetic solution?
A. Thymol
B. Methyl
paraben
C. Sodium
metabisulfite
D. Clove oil
5. Which of the
followings is used as a preservative in local anesthetic solution?
A. Adrenaline
B. Sodium metabisulfite
C. Methylparaben
D. Thymol
6. Which of the
following is/are contraindication/s of local anesthetic with adrenaline?
A. Allergy to
local anesthetic solution
B. Acute
infection
C. Hyperthyroidism
D. All of the
above
7. One of the
complications of prilocaine LA is:
A. Agranulocytosis
B. Hepatic dysfunction
C. Methemoglobinemia
D. None of the above
8. Local
anaesthetics are excreted mainly by:
A. Lungs
B. Fecal route
C. Kidneys
D. Uterus
9. Which of the
following is not used as a topical local anesthesia?
a) Procaine
b) Tetracaine
c) Lidocaine
d) Benzocaine
10. Maximum
recommended dosage of lignocaine with 1:1,00,000 adrenaline subcutaneously is
a) 100 mg
b) 30 mg
c) 500 mg
d) 700 mg
11. The maximum
dose of lignocaine without adrenaline that can be admitted to a patient is
a) 4 mg/kg body wt
b)5 mg/kg body wt
c) 7 mg/kg body wt
d) 9 mg/kg body wt
12. The duration
of anesthesia is decreased when less than the recommended dose of anesthetic is
administered. However, excessive amounts will not increase the duration of anesthesia.
a. Both statements are true.
b. Both statements are false.
c. The first statement is
true; the second is false.
d. The first statement is
false; the second is true.
13. Which
statement is true?
a. Procaine is an amide local
anesthetic.
b. Procaine has a rapid
anesthetic onset.
c. Procaine provides no
pulpal anesthesia.
d. Procaine produces profound
vasoconstriction.
14. Topical
anesthetics
a. penetrate intact skin.
b. are moderately
vasoconstrictive.
c. are effective within 2–3
mm of the application site.
d. usually contain less
anesthetic drug than injectable anesthetics.
15. Epinephrine
(Adrenalin) which is used in dental cartridge of LA acts on:
A. a receptors only
B. B receptors only
C. a and B receptors but B
predominantly
D. a and B receptors but a
predominantly
16. When local anesthetic
agent with adrenalin is injected, the termination of activity of the
vasoconstrictor is brought by:
A. Adrenergic nerve endings
B. Blood enzymes COMT and MAO
C. Excretion in urine (80%)
D. A and B
17. Use of
norepinephrine in dental practice is not recommended because it causes:
A. Bradycardia
B. Intense peripheral
vasoconstriction
C. Hypertension
D. Sensitisation of
myocardium
18. When one has
to use the weakest vasoconstrictor (e.g. in patient with history of angina) one
should consider:
A. Epinephrine
B. Norepinephrine
C. Phenylephrine
D. Levonordefrin
19. Rebound
phenomenon is most commonly seen with use of:
A. Epinephrine
B. Norepinephrine
C. Phenylephrine
D. Levonordefrin
20. The absolute
contraindication for use of adrenalin in LA is:
A. Myocardial infarction, 3-6
months ago
B. Angina pectoris
C. Hyperthyroidism
D. Pregnancy
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