• Calculations

## Vd/Vt

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/PaCO2Peco2 [...]
• RRT Exam Prep

The A-a gradient compares the pressure of oxygen in the alveoli (PAO2) to the pressure of oxygen in the arteries (PaO2). This pressure difference should range between 5 and 10 mm Hg in a healthy [...]
• Calculations

## Respiratory Quotient

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 [...]
• Calculations

## PaO2/FiO2 Ratio

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 [...]
• Calculations

## Alveolar air equation

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 [...]
Calculations

RRT Exam Prep

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## RRT Exam Practice Questions

by DW in RRT Exam Prep

Passing the NBRC RRT board exams on the first try is hard work! There, I said it. Despite the promises some exam review companies make, the reality is that passing on the first attempt is [...]
• ### Vd/Vt

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/PaCO2Peco2 [...]