lungs representing deadspace ventilation
Calculations

Vd/Vt

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The Vd/Vt indicates how much of the tidal volume is composed of deadspace. This is important to monitor because increases in deadspace reduce gas exchange and increase the patient’s work of breathing. Vd/Vt = PaCO2-PECO2/PaCO2 […]

carbohydrates, protein, fats
Calculations

Respiratory Quotient

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What is the respiratory quotient? The respiratory quotient (RQ) is the ratio of carbon dioxide produced to oxygen consumed. This is based primarily on the patient’s diet. A diet high in lipids has an RQ […]

Oxygen masks
Calculations

PaO2/FiO2 Ratio

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The PaO2/FiO2 ratio, also known as the P/F ratio, is a quick calculation often used to determine the severity of ARDS. The P/F ratio is calculated by dividing the arterial oxygen pressure (PaO2) obtained from […]

alveolar gas exchange
Calculations

Alveolar air equation

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The alveolar air equation calculates the partial pressure of oxygen within the alveoli (PAO2). The alveolar air equation is also referred to as the alveolar gas equation. PAO2 = [(Patm – Ph2O)fio2] – [PaCO2/0.8] Why […]