DAANCE Anesthesia Techniques 4 — Questions and Answers
Question 1: When administering a Gow-Gates mandibular block, the injection target is which anatomical landmark?
- Mental foramen
- Inferior alveolar nerve at the lingula
- Neck of the mandibular condyle (Correct answer)
- Mylohyoid ridge
Correct answer: Neck of the mandibular condyle
The Gow-Gates technique targets the neck of the mandibular condyle, anesthetizing the entire mandibular nerve trunk at a higher level than the conventional inferior alveolar block.
Question 2: A patient receiving IV sedation begins to show paradoxical excitement after midazolam administration. The most appropriate next step is to:
- Administer flumazenil immediately
- Increase the midazolam dose
- Add a small dose of opioid or consider alternative sedation agent (Correct answer)
- Terminate the procedure and discharge the patient
Correct answer: Add a small dose of opioid or consider alternative sedation agent
Paradoxical excitement with benzodiazepines is managed by adding an opioid analgesic or switching to an alternative agent, not by increasing the benzodiazepine dose.
Question 3: Which monitoring parameter is MOST critical to assess ventilation adequacy during moderate sedation?
- Blood pressure
- Heart rate
- End-tidal CO2 (capnography) (Correct answer)
- Pulse oximetry SpO2
Correct answer: End-tidal CO2 (capnography)
Capnography provides real-time ventilation monitoring and detects apnea or airway obstruction before hypoxia appears on pulse oximetry.
Question 4: The vasoconstrictor epinephrine is contraindicated at high concentrations in patients taking non-selective beta-blockers because it can cause:
- Profound hypotension followed by reflex tachycardia
- Severe hypertension with reflex bradycardia (Correct answer)
- Prolonged local anesthetic action
- Immediate anaphylaxis
Correct answer: Severe hypertension with reflex bradycardia
Epinephrine's unopposed alpha-adrenergic stimulation in beta-blocked patients causes severe hypertension with compensatory vagal bradycardia.
Question 5: During nitrous oxide administration, a patient complains of nausea. The FIRST intervention should be:
- Administer ondansetron IV
- Immediately discontinue nitrous oxide and administer 100% oxygen
- Reduce nitrous oxide concentration by 5-10% (Correct answer)
- Place the patient in Trendelenburg position
Correct answer: Reduce nitrous oxide concentration by 5-10%
Reducing the nitrous oxide concentration is the first step; if nausea persists, nitrous is discontinued and 100% oxygen administered.
Question 6: When using the 'pressure technique' for intraoral topical anesthetic application, the purpose of applying pressure after topical placement is to:
- Prevent the patient from swallowing the anesthetic
- Enhance mucosal penetration of the topical agent (Correct answer)
- Reduce the volume of topical anesthetic needed
- Prevent post-injection bruising
Correct answer: Enhance mucosal penetration of the topical agent
Applying pressure with a cotton-tipped applicator helps drive the topical anesthetic deeper into the mucosa, improving analgesia at the injection site.
Question 7: Which of the following best describes the correct sequence for a Vazirani-Akinosi (closed-mouth) mandibular block injection?
- Bevel toward bone, needle parallel to maxillary occlusal plane, advance 25 mm
- Bevel toward bone, needle directed inferiorly at 45 degrees, advance 15 mm
- Bevel toward ramus, needle parallel to mandibular occlusal plane, advance 25 mm (Correct answer)
- Bevel away from ramus, needle horizontal, advance 40 mm
Correct answer: Bevel toward ramus, needle parallel to mandibular occlusal plane, advance 25 mm
In the Vazirani-Akinosi technique, the bevel faces the ramus, the needle is directed parallel to the mandibular occlusal plane, and advanced approximately 25 mm to the pterygomandibular space.
DAANCE Anesthesia Techniques 4
When administering a Gow-Gates mandibular block, the injection target is which anatomical landmark?