Certified Transport Registered Nurse Certification Practice Exam

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What is the formula for calculating FiO2?

PaO2 (desired) x FiO2 (current) / PaO2 (current)
PaCO2 (desired) x FiO2 (current) / PaO2 (current)
FiO2 (desired) x PaO2 (current) / PaO2 (desired)
PaO2 (current) x FiO2 (desired) / PaCO2 (current)

The correct answer is: PaO2 (desired) x FiO2 (current) / PaO2 (current)

The formula for calculating FiO2 (Fraction of Inspired Oxygen) is important in assessing and adjusting oxygen therapy effectively. The correct answer articulates that you can determine the desired FiO2 by using the relationship between the desired arterial oxygen partial pressure (PaO2) and the current FiO2 and PaO2 values. This formulation helps healthcare professionals in determining how much supplemental oxygen a patient needs to achieve a specific target oxygenation level (desired PaO2). It’s crucial in clinical settings where precise oxygen management is necessary, particularly in patients with respiratory issues. When applying this formula clinically, it helps to ensure that patients receive adequate oxygenation while minimizing the risks associated with excessive oxygen, such as oxygen toxicity. The other options do not represent the correct relationship needed to calculate FiO2 and thus are not applicable in this context.