Which of the following is the correct form for calculating Raw?

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Multiple Choice

Which of the following is the correct form for calculating Raw?

Explanation:
Raw is the pressure drop across the airways per unit flow during inspiration. Plateau pressure reflects the elastic recoil of the lungs and chest wall when flow is zero, while peak inspiratory pressure includes both that elastic recoil and the pressure needed to overcome airway resistance during flow. Therefore, subtracting Plateau from PIP isolates the resistive component, and dividing by the inspiratory flow rate converts that pressure drop into a resistance value: Raw = (PIP − Plat) / flow. Using the sum or reversing the order would not represent a pressure drop and can give nonsensical or negative values. Hence the correct form is (PIP − Plat)/flow.

Raw is the pressure drop across the airways per unit flow during inspiration. Plateau pressure reflects the elastic recoil of the lungs and chest wall when flow is zero, while peak inspiratory pressure includes both that elastic recoil and the pressure needed to overcome airway resistance during flow. Therefore, subtracting Plateau from PIP isolates the resistive component, and dividing by the inspiratory flow rate converts that pressure drop into a resistance value: Raw = (PIP − Plat) / flow. Using the sum or reversing the order would not represent a pressure drop and can give nonsensical or negative values. Hence the correct form is (PIP − Plat)/flow.

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