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WREB Study Guide With Complete Solutions

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Local anesthesia depresses excitation in nerve endings or inhibiting the conduction of what nerves? periphreal LA differe from other drugs in that most other drugs are absorbed in the blood stre... am but LA stop their action once absorbed where? systemic circulation Why are vasoconstrictors added to LA? decrease blood flow at injection site, constrict blood vessels and allows for a longer working time more profound anesthesia and less bleeding Why are additives and preservatives added to LA? prolong the shelf life by using antioxidant properties What are two examples of additives and preservatives? sodium bisulfite and sodium metasulfite Asthma patients are sensitive to what additive? sulfites If a person is allergic to sodium bisulfite do you use vasoconstrictor? No What does a yellow brown tint indicate? oxidation What should you do if there is oxidation in the carpule? dispose of it. Are LA's vasodilators or vasoconstrictors? vasodilators except cocaine its a vasoconstrictor What phase of nerve conduction has positive ca+ on the outside and negative on the inside with no movement of ions? resting state What phase of nerve conduction has increase permeability to NA+ ions becomes less negative within the nerve? deolarization slow phase [Show More]

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