The client asks the nurse how local anesthetics work. Which response by the nurse is most appropriate?
1. They numb the skin.
2. They block calcium channels.
3. They block sodium channels.
4. They increase sensation.
Correct Answer: 3
Rationale 1: Local anesthetics act by blocking sodium channels. The blocking of sodium channels by local anesthetics is nonselective; therefore, both sensory and motor impulses are affected. Sensation and muscle activity in the treated area will be decreased temporarily. Because of their mechanism of action, local anesthetics are sometimes called sodium channel blockers.
Rationale 2: Local anesthetics act by blocking sodium channels. The blocking of sodium channels by local anesthetics is nonselective; therefore, both sensory and motor impulses are affected. Sensation and muscle activity in the treated area will be decreased temporarily. Because of their mechanism of action, local anesthetics are sometimes called sodium channel blockers.
Rationale 3: Local anesthetics act by blocking sodium channels. The blocking of sodium channels by local anesthetics is nonselective; therefore, both sensory and motor impulses are affected. Sensation and muscle activity in the treated area will be decreased temporarily. Because of their mechanism of action, local anesthetics are sometimes called sodium channel blockers.
Rationale 4: Local anesthetics act by blocking sodium channels. The blocking of sodium channels by local anesthetics is nonselective; therefore, both sensory and motor impulses are affected. Sensation and muscle activity in the treated area will be decreased temporarily. Because of their mechanism of action, local anesthetics are sometimes called sodium channel blockers.
Global Rationale: Local anesthetics act by blocking sodium channels. The blocking of sodium channels by local anesthetics is nonselective; therefore, both sensory and motor impulses are affected. Sensation and muscle activity in the treated area will be decreased temporarily. Because of their mechanism of action, local anesthetics are sometimes called sodium channel blockers.
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