When differentiating between injectable bupivacaine,which is available as a 0.25% to 0.75% solution with a duration of action of 2 to 4 hours,and injectable procaine,which is available as a 1% to 2% solution with a duration of action of 15 minutes to 1 hour,the choice of agent used for injection around the spinal cord is primarily determined by the:

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The choice of anesthetic is usually based on the duration of action required. The long-acting, potent amide anesthetics are administered primarily by injection.

When Differentiating Between Injectable Bupivacaine,which Is Available as a 0