Local Anesthetic CDCA Exam: PART ONE Questions with Complete Solutions

Local Anesthetic CDCA Exam: PART ONE Questions with Complete Solutions What happens during depolarization? - Correct Answers Sodium in, Potassium out Primary action of local anesthetic in producing a conduction block? - Correct Answers *DECREASE* sodium's ability to permeate LA *decreases* the rate of depolarization and *increases* the firing threshold True or False? - Correct Answers True LA blocks the sensation of pain by? - Correct Answers Blocking nerve conduction to a circumscribed area of the body Why does anesthesia fail to work near an abscessed tooth? - Correct Answers Infection lowers the pH of the tissue, which does not allow ionization of sodium molecules. Blood diffuseses the anesthetic away from the injection site (inflammation = higher blood flow) Which LA is metabolized by pseudocholinesterase? - Correct Answers Esters: -Procaine (Novacain) -Benzocaine Which anesthetic is not an amide? - Correct Answers Procaine (Novocaine) Most common anesthetic without epi? - Correct Answers Mepivacaine (Carbocaine/ Polocaine) first sign of LA toxicity? - Correct Answers CNS excitement Where is epi naturally found in the body? - Correct Answers Adrenal medulla on kidneys/ Endocrine system