#1
Which of the following oxygen delivery systems delivers the highest concentration of oxygen?
Non-rebreather mask
ExplanationDelivers highest O2 concentration due to one-way valve and reservoir bag.
#2
In a nasal cannula, at what rate (in liters per minute) does oxygen typically flow?
1-2 L/min
ExplanationProvides low-flow oxygen at 1-2 L/min.
#3
Which oxygen delivery system is commonly used in patients with chronic obstructive pulmonary disease (COPD)?
Venturi mask
ExplanationSuitable for COPD patients needing controlled FiO2.
#4
What is the purpose of a reservoir bag in an oxygen mask?
To store excess oxygen for inhalation during inspiration
ExplanationStores O2 during exhalation to ensure continuous flow.
#5
What is the purpose of humidification in oxygen therapy?
To prevent drying of the mucous membranes
ExplanationPrevents drying of mucous membranes to enhance comfort.
#6
Which oxygen delivery system allows the patient to rebreathe a portion of exhaled air?
Partial rebreather mask
ExplanationAllows partial rebreathing to increase O2 concentration.
#7
What is the maximum oxygen flow rate for a nasal cannula?
10 L/min
ExplanationMaximum flow rate for adequate oxygenation.
#8
What is the typical FiO2 (Fraction of Inspired Oxygen) delivered by a nasal cannula?
0.21
ExplanationDelivers atmospheric O2 concentration.
#9
Which oxygen delivery system provides a precise oxygen concentration regardless of the patient's breathing pattern?
Venturi mask
ExplanationMaintains constant FiO2 independent of breathing.
#10
In which scenario would a non-rebreather mask be contraindicated?
During chest trauma
ExplanationRisk of exacerbating pneumothorax or worsening respiratory status.
#11
Which oxygen delivery system is most suitable for patients requiring long-term oxygen therapy at home?
Oxygen concentrator
ExplanationProvides continuous oxygen supply without refills.
#12
Which oxygen delivery system should be used in cases of severe upper airway obstruction?
Bag-valve-mask (BVM)
ExplanationProvides positive pressure ventilation in upper airway obstruction.
#13
Which oxygen delivery system provides the most precise control over FiO2?
Venturi mask
ExplanationOffers accurate FiO2 control with interchangeable adapters.
#14
In which situation is a high-flow nasal cannula (HFNC) typically used?
Post-extubation respiratory support
ExplanationProvides comfortable, humidified O2 post-extubation.