DAANCE Airway Management and Oxygen Therapy 4

Question 1

A patient receiving N2O/O2 sedation develops stridor during the procedure. What is the MOST likely cause?

Accepted Answer

Laryngospasm

Answer

Stridor is a high-pitched sound caused by partial upper airway obstruction, most commonly laryngospasm in the dental sedation setting.

Question 2

Which oxygen delivery device provides the HIGHEST fraction of inspired oxygen (FiO2) in a spontaneously breathing patient?

Accepted Answer

Non-rebreather mask

Answer

A non-rebreather mask with a properly inflated reservoir bag can deliver FiO2 up to 90-95% at 10-15 L/min flow.

Question 3

When performing a jaw thrust maneuver on a patient with suspected cervical spine injury, which technique modification is most appropriate?

Accepted Answer

Displace the mandible anteriorly without head tilt

Answer

The jaw thrust without head tilt displaces the mandible forward to open the airway while maintaining cervical spine neutrality.

Question 4

A nasal cannula delivering oxygen at 4 L/min provides an approximate FiO2 of:

Accepted Answer

36%

Answer

Each liter per minute of nasal cannula flow adds approximately 4% FiO2 above room air (21%), so 4 L/min ≈ 37% (commonly rounded to 36%).

Question 5

During N2O/O2 sedation, the minimum oxygen concentration that must be maintained is:

Accepted Answer

25%

Answer

A minimum of 25% oxygen must be delivered at all times during N2O/O2 sedation to prevent hypoxia, per DAANCE and AAPD guidelines.

DAANCE - Dental Anesthesia Assistant National Certification Examination Practice Test