A physician is preparing to suture a patient who has a ...

[sabina]

A physician is preparing to suture a patient who has a superficial stab wound in the leg. The physician asks the nurse for lidocaine with epinephrine.
 
  The nurse understands that concurrent administration of lidocaine with epinephrine results in the epinephrine having which effect on the lidocaine?
  a. Epinephrine prolongs anesthesia and reduces the risk of toxicity.
  b. Epinephrine delays absorption of the lidocaine, which results in a longer anesthetic effect.
  c. Epinephrine increases perfusion by increasing blood flow to the area.
  d. Epinephrine causes an antiadrenergic effect.

Question 2

A nurse is teaching a pharmacology class to a group of nurses.
 
  To evaluate the group's understanding of local anesthetics, the nurse asks, Which electrolyte channels inhibit axonal conduction as a result of the administration of a local anesthetic? The best response of a participant would be _____ channels.
  a. potassium
  b. calcium
  c. sodium
  d. chloride

[LegendaryAnswers]

Answer to Question 1

ANS: A
Epinephrine causes vasoconstriction and reduces local blood flow. It delays systemic absorption of the anesthetic, which results in prolonged anesthesia and a reduced risk of toxicity.
Epinephrine does not delay absorption of lidocaine.
Epinephrine does not increase blood flow.
Epinephrine causes an adrenergic effect, not an antiadrenergic effect.

Answer to Question 2

ANS: C
Administration of a local anesthetic stops axonal conduction by blocking sodium channels.
Administration of a local anesthetic does not stop axonal conduction by blocking potassium, calcium, or chloride channels.

[sabina]

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[bitingbit]

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