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.
3
Rationale 1:This statement reflects the evaluation of what the patient experiences.
Rationale 2: Local anesthetics act by blocking sodium channels not calcium channels.
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 decrease sensation. This is what the patient experiences and not how the local anesthetics work.
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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