Which statement about PPOB is true?

Which statement about PPOB is true?

• A. PPOB supplies oxygen only when a person is physically breathing
• B. PPOB supplies oxygen continuously regardless of breathing
• C. PPOB is used for high-flow emergencies
• D. PPOB is used only on the ground

Answer: (A)

Oxygen delivery that responds to the patient’s own breathing is being tested. PPOB is described as delivering oxygen only when the person is inhaling, meaning it provides oxygen in sync with inspiration and helps conserve oxygen by not emitting a continuous stream between breaths. The idea contrasts with continuous-flow systems, which push oxygen out all the time regardless of whether the patient is inhaling. The other statements describe situations (continuous supply, use in high-flow emergencies, or use only on the ground) that don’t align with the on-demand, breath-synchronized function of PPOB.

Oxygen delivery that responds to the patient’s own breathing is being tested. PPOB is described as delivering oxygen only when the person is inhaling, meaning it provides oxygen in sync with inspiration and helps conserve oxygen by not emitting a continuous stream between breaths. The idea contrasts with continuous-flow systems, which push oxygen out all the time regardless of whether the patient is inhaling. The other statements describe situations (continuous supply, use in high-flow emergencies, or use only on the ground) that don’t align with the on-demand, breath-synchronized function of PPOB.