Addition of vasoconstrictor to local anesthetic (1)reduces blood supply to the area, (2)increases blood supply to the area, (3)limits systemic absorption, (4)increases systemic absorption, (5)reduces systemic toxicity,and (6)increases systemic toxicity.Which of these are correct?

Question

Quizplus · Accepted Answer

The vasoconstrictor reduces the blood supply to the area,limits systemic absorption,and reduces systemic toxicity.When a local anesthetic solution does not contain a vasoconstrictor,the anesthetic drug is more quickly removed from the injection site and distributed into systemic circulation than if the solution contained a vasoconstrictor.Plain anesthetics will exhibit a shorter duration of action and result in a more rapid buildup of a systemic blood level.Therefore,any anesthetic given without a vasoconstrictor is more likely to be toxic than those given with a vasoconstrictor.The remaining choices do not reflect the pharmacokinetic effects of adding a vasoconstrictor to a dental local anesthetic.

Addition of Vasoconstrictor to Local Anesthetic (1)reduces Blood Supply to the Area