Select Page

## Arterial Oxygen Content (CaO2) Equation

Arterial Oxygen Content The arterial oxygen content (CaO2) definition is the amount of oxygen bound to hemoglobin (1.34 * Hb * SaO2) plus the oxygen dissolved in plasma (0.0031 * PaO2). The arterial oxygen content equation: CaO2 = (1.34 * Hb * SaO2) + (0.0031 * PaO2)....

## Static Compliance (Cstat) Calculation

Static Compliance (Cstat) is used during periods without gas flow, such as during an inspiratory pause. Cstat = ΔV / Pplat – PEEP. Static Compliance = Pressure it takes to overcome the elastic resistance to ventilation. Corrected Tidal Volume (ΔV) in mL: Pplat...

## Calculate Rapid Shallow Breathing Index (RSBI)

Rapid Shallow Breathing Index (RSBI) also known as Tobin Index is the ratio determined by the frequency (f) divided by the tidal volume (Vt) in liters during a Spontaneous Breathing Trail (SBT). The SBT is done while while the patient is intubated. An RSBI < 105...

## Oxygen Index (OI)

Oxygenation Index = (FiO2 * Mean Airway Pressure) / PaO2 The oxygenation index is used to assess the intensity of ventilatory support required to maintain oxygenation. It is used in neonates / pediatrics to assess the need for potential ECMO therapy. Fraction of...

## Dynamic Compliance (Cdyn) Calculation

Dynamic Compliance (Cdyn) is used to assess the changes in the non-elastic (airway) resistance to air flow. Cdyn = Vt/ PIP-PEEP. Corrected Tidal Volume (ΔV) in mL: PIP in cmH2O: PEEP in cmH2O: Dynamic Compliance (Cdyn) in mL/cmH2O   Download RespCalc Respiratory...

## Alveolar Gas Equation (PAO2)

Alveolar Gas Equation is used to calculate the partial pressure of oxygen in the alveoli: PAO2 = ( FiO2 * (Patm – PH2O)) – (PaCO2 / RQ). The FiO2 is the fraction of inspired oxygen (usually as a fraction, but entered here as a percentage for ease of use). Patm is the...