ATI RN
Oxygen Cycle Questions and Answers Questions
Question 1 of 5
Which of the following best describes a mode of ventilation where every breath is time or patient triggered, pressure targeted, and time cycled?
Correct Answer: B
Rationale: Pressure Control Ventilation (PCV) is time or patient triggered, pressure targeted, and time cycled, matching the description.
Question 2 of 5
The most common cause of COPD is:
Correct Answer: C
Rationale: Smoking tobacco is the leading cause of COPD, accounting for the majority of cases.
Question 3 of 5
You obtained an arterial blood gas sample from a patient who is hypothermic. In the ABG analyzer, you get a PO₂ of 85 mmHg. Which of the following could infer in your interpretation of this result?
Correct Answer: D
Rationale: ABG analyzers heat samples to 37°C, overestimating PaO₂ in hypothermic patients, requiring temperature correction for accuracy.
Question 4 of 5
Calculate the oxygen index for a neonate with the following: ABG - pH 7.21, PaCO₂ 65, HCO⁴‚ƒ 20, PaO₂ 40, HFOV - MAP 18, Hz 10, Amp 30, I:E 1:2, FiO₂ 0.80, HR 145, BP 70/40, SpO₂ 88%
Correct Answer: D
Rationale: OI = (MAP x FiO₂ x 100) / PaO₂ = (18 x 0.80 x 100) / 40 = 36.
Question 5 of 5
In what age group would a nurse expect to assess the most rapid respiratory rate?
Correct Answer: D
Rationale: Infants have the highest respiratory rate (30-60 breaths/min) due to their smaller lung capacity and higher metabolic demand.