• lungs representing deadspace ventilation


    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 [...]
  • oxygen pressure
    RRT Exam Prep

    A-a Gradient

    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 [...]
  • carbohydrates, protein, fats

    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 [...]
  • Oxygen masks

    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 [...]
  • alveolar gas exchange

    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 [...]
Respiratory Therapy Study Guide
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RRT Exam Practice Questions

by DW in RRT Exam Prep 0

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 [...]

Basic Waveform Analysis