Local Anesthetics Flashcards Preview

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Flashcards in Local Anesthetics Deck (10):
1

Local anesthetics

Esters (have only one "I" in their names)
-higher allergic tendency
Tetracaine, procaine, benzocaine

Amides (have 2 "I" in their names)
Bupivacaine, Ropivacaine, Lidocaine

2

Half life of local anesthetics

Procaine = shortest half life (1-2 mins)
Ropivacaine = longest half life (4.2 hrs)

3

Why should you not inject local anesthetics into an abscess during I&D?

It wont work due to the acidic environment of the abscess
(below pKa = charge form will dominate w/c cant cross the barrier)

4

CNS effects of local anesthetics

Generalized tonic-clonic seizures

5

Only local anesthetic that vasoconstricts

Cocaine

6

Highest allergic potential among local anesthetics

Tetracaine

7

Class Local Anesthetic
Uses: Anti-arrythmic (group 1B; used in post MI & digitalis toxicity)

Lidocaine

8

Lidocaine toxic dose

5 mg/kg

9

Class: Local anesthetic
Use: Dental anesthesia
SE: methemoglobinemia

Prilocaine

Antidote: Methylene blue
- convert ferric (Fe3+) to ferrous (Fe2+)

10

Cardiotoxic local anesthetic

Bupivacaine
Treat w/ intralipid (fat emulsion used in TPN)