What determines the duration of a local anesthetic?

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Multiple Choice

What determines the duration of a local anesthetic?

Explanation:
The duration of a local anesthetic is set mainly by how long the drug stays near the nerve, which is governed by protein binding. When the anesthetic binds to tissue and plasma proteins, it acts as a reservoir and is released slowly, prolonging the nerve blockade. pH affects how quickly the drug onset occurs by altering the balance of ionized versus nonionized forms, not how long the effect lasts. Color is irrelevant, and while molecular weight can influence other properties, it’s not the primary factor determining duration. So, protein binding best explains how long the anesthesia persists.

The duration of a local anesthetic is set mainly by how long the drug stays near the nerve, which is governed by protein binding. When the anesthetic binds to tissue and plasma proteins, it acts as a reservoir and is released slowly, prolonging the nerve blockade. pH affects how quickly the drug onset occurs by altering the balance of ionized versus nonionized forms, not how long the effect lasts. Color is irrelevant, and while molecular weight can influence other properties, it’s not the primary factor determining duration. So, protein binding best explains how long the anesthesia persists.

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