RDA Assisting with Administration of Anesthesia and Sedation 4 — Questions and Answers
Question 1: During nitrous oxide sedation, a patient suddenly becomes excited and uncooperative. What is the most likely cause?
- The nitrous oxide concentration is too high (Correct answer)
- The oxygen flow rate is too low
- The patient is having an allergic reaction
- The nasal mask is improperly seated
Correct answer: The nitrous oxide concentration is too high
Excessive nitrous oxide concentration can cause paradoxical excitement, dysphoria, or uncooperative behavior in some patients.
Question 2: Which intraoral injection technique deposits anesthetic near the mental foramen to anesthetize mandibular premolars?
- Inferior alveolar nerve block
- Mental nerve block (Correct answer)
- Long buccal nerve block
- Gow-Gates block
Correct answer: Mental nerve block
The mental nerve block targets the mental foramen, providing anesthesia to the mandibular premolars, anterior teeth, and adjacent soft tissue.
Question 3: A patient's oxygen saturation (SpO2) drops to 91% during moderate sedation. What is the first action the dental team should take?
- Administer a reversal agent immediately
- Increase the oxygen flow rate (Correct answer)
- Terminate the procedure and call 911
- Reposition the pulse oximeter probe
Correct answer: Increase the oxygen flow rate
A drop in SpO2 should first be addressed by increasing supplemental oxygen delivery before escalating to more advanced interventions.
Question 4: Which of the following best describes the term 'vasoconstrictor' as used in local anesthetic solutions?
- An agent that speeds nerve conduction
- An agent that prolongs anesthetic duration and reduces systemic absorption (Correct answer)
- An agent that neutralizes the pH of the solution
- An agent that prevents allergic reactions
Correct answer: An agent that prolongs anesthetic duration and reduces systemic absorption
Vasoconstrictors such as epinephrine constrict blood vessels at the injection site, prolonging anesthetic effect and slowing systemic absorption.
Question 5: When assisting with IV sedation, the RDA notices the patient's IV site is swollen and the skin feels cool and tight. This most likely indicates:
- Phlebitis
- Extravasation (infiltration) (Correct answer)
- An air embolism
- Thrombosis
Correct answer: Extravasation (infiltration)
Swelling, coolness, and tightness at an IV site are classic signs of extravasation, meaning the IV fluid has leaked into surrounding tissue.
Question 6: For a patient with documented allergy to ester-type local anesthetics, which alternative should the dentist consider?
- Procaine
- Benzocaine
- Lidocaine (Correct answer)
- Tetracaine
Correct answer: Lidocaine
Lidocaine is an amide-type local anesthetic and is generally safe for patients allergic to ester-type agents like procaine, benzocaine, or tetracaine.
Question 7: Which of the following is a key criterion for patient discharge after nitrous oxide sedation?
- The patient must be escorted home by a responsible adult
- The patient must receive 100% oxygen for a minimum of 5 minutes post-procedure (Correct answer)
- The patient must have an SpO2 of at least 95% before dismissal
- The patient must remain in the office for at least 60 minutes
Correct answer: The patient must receive 100% oxygen for a minimum of 5 minutes post-procedure
Patients must breathe 100% oxygen for at least 5 minutes after nitrous oxide is discontinued to prevent diffusion hypoxia.
RDA Assisting with Administration of Anesthesia and Sedation 4
During nitrous oxide sedation, a patient suddenly becomes excited and uncooperative.
What is the most likely cause?