Deck 12: Local Anesthetics

Question 1

Differential nerve block occurs because the small diameter,unmyelinated neurons that convey _______ are the most sensitive to local anesthetics.

A)pain
B)temperature
C)touch
D)proprioception
E)motor impulses

Answer 1

pain

Question 2

Local anesthetics are sometimes used to treat complex regional pain syndrome (CRPS),also known as reflex sympathetic dystrophy syndrome (RSDS),by administering the drug:

A)intra-arterially into the affected limb.
B)near the sympathetic chain ganglia that innervate the affected limb.
C)into the third ventricle of the brain.
D)into the fourth ventricle of the brain.
E)none of the above;local anesthetics are not used to treat this problem.

Answer 2

near the sympathetic chain ganglia that innervate the affected limb.

Question 3

Local anesthetics inhibit action potential propagation along neuronal axons by blocking the opening of ________ channels.

A)potassium
B)sodium
C)chloride
D)calcium
E)magnesium

Answer 3

sodium

Question 4

In order to provide symptomatic relief from minor surface irritation and injury (minor burns,abrasions,and so forth),local anesthetics are typically applied:

A)intravenously.
B)intrathecally.
C)topically.
D)by inhalation.
E)none of the above;local anesthetics are never applied for symptomatic relief of minor skin irritation.

Question 5

Intravenous regional anesthesia (Bier block)is achieved by:

A)injecting a local anesthetic into a peripheral vein located in a selected limb.
B)injecting a general anesthetic into a peripheral vein located in a selected limb.
C)injecting a local anesthetic into the superior vena cava.
D)injecting a local anesthetic into the inferior vena cava.
E)none of the above

Question 6

Local anesthetics can be administered via all of the following routes EXCEPT:

A)transdermally.
B)subcutaneous infiltration.
C)direct injection into the epidural space.
D)direct injection into the third ventricle of the brain.
E)direct injection into the subarachnoid space.

Question 7

Local anesthetics can be administered via a transdermal patch to treat:

A)localized joint pain associated with osteoarthritis.
B)neuropathic pain associated with postherpetic neuralgia and diabetic neuropathy.
C)localized soft tissue joint pain associated with myofascial disease.
D)all of the above
E)none of the above

Question 8

Absorption of local anesthetics into the system circulation is dangerous because these drugs can:

A)decrease the force of cardiac contraction.
B)cause bradycardia.
C)inhibit respiratory control centers in the central nervous system.
D)all of the above
E)none of the above