Egans Chapter 42 (Medical Gas Therapy) Unit
Exam Questions with Correct Answers 2026
A 52-year-old man is admitted to the hospital emergency department with a primary complaint of
se vere radiating chest pain and signs of central cyanosis. The attending asks for your advice o
n selecting a device that provides the best FiO2 for this patient. Which of the following wo uld
you recommend ? - CORRECT ANSWER -Simple O2 mask @ 8L/M
Ref page 911
Which of the following clinical situations would you recommend hyperbaric oxygen (HBO) t
herapy, if it is available ? - CORRECT ANSWER -
Carbon monoxide poisoning & Cyanide poisoning. Ref page 925-927
Carbon monoxide & Cyanide poisoning may necessitate HBO therapy
What are some key patient considerations in selecting O2 therapy equipment?
• Type of airway (natural or artificial)
• Severity and cause of the hypoxemia
• Age group (infant, child, adult)
• Stability of the minute ventilation - CORRECT ANSWER -
• Severity and cause of the hypoxemia
• Age group (infant, child, adult)
• Stability of the minute ventilation
Ref page 924 box 42.4-Patient Factors in Selecting Oxygen Therapy Equipment
,What is the name of a common low-
flow, nasal O2 delivery device that is capable of providing both high humidity and a high Fi
O2 ? - CORRECT ANSWER -A (low flow) nasal cannula. Ref page 911
Directing a cool O2 mixture to an infant in an Oxy-Hood can lead to ? -
CORRECT ANSWER -
In premature infants, cold stress can increase O2 consumption and even cause apnea.
Ref Chapter 54; Page 1222 Table 54.7
What is/are the correct procedure(s) in giving O2 to an infant through a Oxy-Hood ? -
CORRECT ANSWER -1. A neutral & thermal environment should be kept.
2. Gases should be directed away from infants face.
3. High input flow greater than 10-15 should be avoided.
Ref Chapter 54; Page 1222 Table 54.7
According to AARC clinical practice guidelines, what is the minimum frequency for checking
the functioning of an O2 delivery system ? - CORRECT ANSWER -24 hours
Ref Chapter 54; Page 1222 Table 54.7
What is the problem with input flows greater than 10 to 15 L/min in an infant Oxy-
Hood ? - CORRECT ANSWER -
Higher flow generally is not needed and may produce a harmful noise level and additional
stress on neonatal patients.
, A physician wants a stable FiO2 of 50% for a newborn infant with severe hypoxemia. Whic
h system(s) would you select ? - CORRECT ANSWER -Oxy-
hood with heated humidification via Oxygen blender
Ref Chapter 54; Page 1222 Table 54.7
To confirm proper operation of an O2 blending system, what you would check and do ? -
CORRECT ANSWER -
1. Confirm that inlet pressures of air and O2 are within the manufacturer's specifications.
2. Test low air and O2 alarms by disconnecting each source; also confirm safety bypass or c
rossover system.
3. Analyze O2 concentration at 100%, 21% and specified FiO2.
Ref page 924 Box 42.3
What are components of a typical O2 blender ? - CORRECT ANSWER -
1. Precision metering device or mixture control
2. Audible dual pressure (low) alarm system
3. Pressure regulating & equalizing valve
Ref page 924 Fig.42.19
Calculation: A physician requests that you provide a patient with exactly 40% O2 at a flow
of 60 L/min. Lacking a blender, you must manually mix air and O2 to achieve the desired
mixture at the prescribed flow. Which of the following air and O2 flows would you select?
Air (L/min) & O2 (L/min) ? - CORRECT ANSWER -Air:46 LPM
O2:14 LPM
Exam Questions with Correct Answers 2026
A 52-year-old man is admitted to the hospital emergency department with a primary complaint of
se vere radiating chest pain and signs of central cyanosis. The attending asks for your advice o
n selecting a device that provides the best FiO2 for this patient. Which of the following wo uld
you recommend ? - CORRECT ANSWER -Simple O2 mask @ 8L/M
Ref page 911
Which of the following clinical situations would you recommend hyperbaric oxygen (HBO) t
herapy, if it is available ? - CORRECT ANSWER -
Carbon monoxide poisoning & Cyanide poisoning. Ref page 925-927
Carbon monoxide & Cyanide poisoning may necessitate HBO therapy
What are some key patient considerations in selecting O2 therapy equipment?
• Type of airway (natural or artificial)
• Severity and cause of the hypoxemia
• Age group (infant, child, adult)
• Stability of the minute ventilation - CORRECT ANSWER -
• Severity and cause of the hypoxemia
• Age group (infant, child, adult)
• Stability of the minute ventilation
Ref page 924 box 42.4-Patient Factors in Selecting Oxygen Therapy Equipment
,What is the name of a common low-
flow, nasal O2 delivery device that is capable of providing both high humidity and a high Fi
O2 ? - CORRECT ANSWER -A (low flow) nasal cannula. Ref page 911
Directing a cool O2 mixture to an infant in an Oxy-Hood can lead to ? -
CORRECT ANSWER -
In premature infants, cold stress can increase O2 consumption and even cause apnea.
Ref Chapter 54; Page 1222 Table 54.7
What is/are the correct procedure(s) in giving O2 to an infant through a Oxy-Hood ? -
CORRECT ANSWER -1. A neutral & thermal environment should be kept.
2. Gases should be directed away from infants face.
3. High input flow greater than 10-15 should be avoided.
Ref Chapter 54; Page 1222 Table 54.7
According to AARC clinical practice guidelines, what is the minimum frequency for checking
the functioning of an O2 delivery system ? - CORRECT ANSWER -24 hours
Ref Chapter 54; Page 1222 Table 54.7
What is the problem with input flows greater than 10 to 15 L/min in an infant Oxy-
Hood ? - CORRECT ANSWER -
Higher flow generally is not needed and may produce a harmful noise level and additional
stress on neonatal patients.
, A physician wants a stable FiO2 of 50% for a newborn infant with severe hypoxemia. Whic
h system(s) would you select ? - CORRECT ANSWER -Oxy-
hood with heated humidification via Oxygen blender
Ref Chapter 54; Page 1222 Table 54.7
To confirm proper operation of an O2 blending system, what you would check and do ? -
CORRECT ANSWER -
1. Confirm that inlet pressures of air and O2 are within the manufacturer's specifications.
2. Test low air and O2 alarms by disconnecting each source; also confirm safety bypass or c
rossover system.
3. Analyze O2 concentration at 100%, 21% and specified FiO2.
Ref page 924 Box 42.3
What are components of a typical O2 blender ? - CORRECT ANSWER -
1. Precision metering device or mixture control
2. Audible dual pressure (low) alarm system
3. Pressure regulating & equalizing valve
Ref page 924 Fig.42.19
Calculation: A physician requests that you provide a patient with exactly 40% O2 at a flow
of 60 L/min. Lacking a blender, you must manually mix air and O2 to achieve the desired
mixture at the prescribed flow. Which of the following air and O2 flows would you select?
Air (L/min) & O2 (L/min) ? - CORRECT ANSWER -Air:46 LPM
O2:14 LPM
