DAANCE Airway Management and Oxygen Therapy 3

Question 1

What is the maximum recommended oxygen flow rate for a nasal cannula before higher flow rates become ineffective and uncomfortable?

Accepted Answer

6 L/min

Answer

Flow rates above 6 L/min via nasal cannula do not significantly increase FiO2 and cause mucosal dryness and patient discomfort.

Question 2

In complete laryngospasm, positive-pressure bag-mask ventilation is ineffective primarily because:

Accepted Answer

The vocal cords are tightly adducted, blocking air entry

Answer

Complete laryngospasm involves tight adduction of the true and false vocal cords, creating a seal that positive pressure alone cannot overcome.

Question 3

Succinylcholine is the drug of choice for complete laryngospasm that does not resolve with positive-pressure oxygen because it:

Accepted Answer

Causes rapid neuromuscular blockade to relax laryngeal muscles

Answer

Succinylcholine is a rapid-onset depolarizing neuromuscular blocking agent that relaxes the laryngeal muscles within 60 seconds, breaking the laryngospasm.

Question 4

Which monitoring device continuously and non-invasively measures arterial oxygen saturation during sedation?

Accepted Answer

Pulse oximeter

Answer

A pulse oximeter uses photoplethysmography to measure the percentage of hemoglobin saturated with oxygen continuously without arterial puncture.

Question 5

End-tidal CO2 (EtCO2) monitoring is particularly valuable during sedation because it can detect:

Accepted Answer

Apnea or hypoventilation earlier than pulse oximetry

Answer

EtCO2 reflects the CO2 in exhaled gas; apnea or hypoventilation causes the waveform to disappear or CO2 to rise before SpO2 begins to fall, providing earlier warning.

DAANCE - Dental Anesthesia Assistant National Certification Examination Practice Test

DAANCE - Dental Anesthesia Assistant National Certification Examination Practice Test

DAANCE Airway Management and Oxygen Therapy 3