LPN Respiratory Care and Oxygenation

Question 1

What is the normal oxygen saturation (SpO2) range for a healthy adult?

Accepted Answer

95-100%

Answer

Normal SpO2 for healthy adults is 95-100%; values below 90% indicate hypoxemia requiring immediate intervention.

Question 2

Which oxygen delivery device provides the most precise and controlled oxygen concentration?

Accepted Answer

Venturi mask

Answer

The Venturi mask uses color-coded jet-mixing adapters to deliver precise, controlled FiO2 concentrations, making it ideal for COPD patients sensitive to high oxygen levels.

Question 3

An LPN is caring for a patient with COPD requiring supplemental oxygen. Which flow rate should be used cautiously to avoid suppressing the hypoxic drive?

Accepted Answer

1-2 L/min via nasal cannula

Answer

COPD patients rely on low oxygen levels as their primary drive to breathe; low-flow oxygen (1-2 L/min) maintains SpO2 at 88-92% without suppressing this hypoxic drive.

Question 4

Which position is most appropriate for a patient experiencing acute respiratory distress?

Accepted Answer

High Fowler's (90 degrees)

Answer

High Fowler's position promotes maximum lung expansion by allowing the diaphragm to descend fully, improving ventilation and oxygenation.

Question 5

A patient is using a nasal cannula at 4 L/min. What approximate FiO2 is being delivered?

Accepted Answer

36%

Answer

At 4 L/min via nasal cannula, the approximate FiO2 is 36%; each liter per minute adds approximately 4% above the 21% baseline of room air.

LPN - Licensed Practical Nurse Practice Test

LPN - Licensed Practical Nurse Practice Test

LPN Respiratory Care and Oxygenation