CDCA Review: Local Anesthesia
Questions and Answers 100% Pass
What local anesthetic is metabolized by pseudocholinesterase? ✔✔Esters
Where are ester local anesthetics hydrolyzed? ✔✔In the blood plasma by the enzyme pseudocholinesterase
Which antiseptic should not be used? ✔✔Liquid Alcohol
Before using a cartridge you should:
1) wipe it with disinfectant
2) soak it in alcohol
3) autoclave it and or sterilize it? ✔✔None of the above
What part of the syringe indicates that it is an aspirating syringe? ✔✔Harpoon 1 / 3
What is a possible cause of pain on removal of the needle? ✔✔Needle barb from impaling bone
If there is no organic basis for pain ✔✔Psychogenic pain
How does a self aspirating syringe work ✔✔When you let off pressure from injecting it self- aspirates (negative pressure built into the syringe)
When do you aspirate? ✔✔Immediately before you inject local anesthetic
What is the action of vasodepressors in local anesthetic? ✔✔increases depth and duration of anesthetic, decreases absorption of local anesthetic and vasopressor
Maximum Doses of Epinephrine ✔✔Normal healthy patient - .2 mg Cardiac patient - .04 mg
How much epinephrine is in a cartridge of 1:50,000 epinephrine? ✔✔.036 mg
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How much epinephrine is in a cartridge of 1:100,000 epinephrine? ✔✔.018 mg
How much epinephrine is in a cartridge of 1:200,000 epinephrine? ✔✔.009 mg
What causes a hematoma? ✔✔Effusion of blood into extravascular spaces and can result from nicking a blood vessel, artery or vein. Common in pterygoid plexus of veins with a PSA injection.
Treatment of Hematoma ✔✔Apply pressure for at least 2 minutes, Ice the area immediately, and then use warm moist towels 4-6 hours after to area, rinse with salt water
In which injection is a hematoma most likely to occur? ✔✔PSA
What is the volume of local anesthetic in a cartridge? ✔✔1.8 mL or 1.7 mL
How do you determine gauge and lumen size of a needle? ✔✔Smaller the number, larger the lumen 30 = small
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