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Chapter 16: Local Anesthetics

Which of the following local anesthetics does not cause vasodilation?

a. Cocaine

b. Lidocaine

c. Benzocaine

d. Ropivacaine

Which of the following local anesthetics is most likely to cause hypoxemia?

a. Lidocaine

b. Prilocaine

c. Tetracaine

d. Cocaine

The patient is recovering from orthopedic day surgery with an intrathecal injection for local anesthesia. She complains of a headache when standing or sitting, and the headache is relieved when she lies down. The patient may be demonstrating which of the following manifestations?

a. Migraine headache

b. Hyperesthesia

c. Nystagmus

d. Spinal headache

Which form of the local anesthetic is responsible for sodium channel blockade in the plasma membrane?

a. Nonionized base

b. Nonionized acid

c. Ionized base

d. Ionized acid

A local anesthetic enters the sodium channel from which interface?

a. Extracellular

b. Intercellular

c. Paracellular

d. Cytoplasmic

Which nerve fiber type is the least susceptible to local anesthetics?

a. Type B fiber

b. Type A gamma fiber

c. Type A alpha fiber

d. Type C fiber

In which of the following states is the sodium channel least sensitive to the blockade effect of local anesthetics?

a. Active state

b. Resting state

c. Inactive state

d. Recovered state

Analgesia occurs prior to anesthesia due to the increased sensitivity of which of the following nerve fiber types?

a. Type A beta fibers

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