What is the formula for PF ratio?

What is the formula for PF ratio?

The P/F ratio equals the arterial pO2 (“P”) from the ABG divided by the FIO2 (“F”) – the fraction (percent) of inspired oxygen that the patient is receiving expressed as a decimal (40% oxygen = FIO2 of 0.40).

What does PF ratio represent?

An O2 sat of 90% corresponds to a PaO2 of 60 mmHg. Note how quickly Hgb loses oxygen below 90% saturation. If you look at the Oxygen-Hemoglobin Dissociation Curve, a PaO2 of 100 and 250 both have an O2 sat of 100% because both provide enough oxygen molecules to fill all of the Hgb binding sites.

What is the normal range for PAO2 FiO2?

The New P/FP Ratio of 300 to 200 is mild, 200 to 100 is moderate and less than 100 is severe Adult Respiratory Distress Syndrome (ARDS) for all the different levels of PEEP values.

What is spo2 FiO2 ratio?

Purpose: Oxygen saturation to fraction of inspired oxygen ratio (SpO(2)/FiO(2)) has been validated as a surrogate marker for partial pressure of oxygen to fraction of inspired oxygen ratio among mechanically ventilated patients with acute respiratory distress syndrome (ARDS).

What’s the difference between PaO2 and SaO2?

PaO2, the partial pressure of oxygen in the arterial blood, is determined solely by the pressure of inhaled oxygen (the PIO2), the PaCO2, and the architecture of the lungs. SaO2 is the percentage of available binding sites on hemoglobin that are bound with oxygen in arterial blood.

What is SpO2 and SaO2?

SpO2 = oxygen saturation as measured by pulse oximeter. SaO2 = oxygen saturation as measured by blood analysis (e.g. a blood gas) PaO2 = partial pressure of oxygen in the blood, as measured by blood analysis.

What is VT in ventilator?

Protective ventilation refers to the use of low tidal volume (VT), often in the range of 4–8 mL/kg of predicted body weight (PBW). In fact, 6 mL/kg is the normal physiologic VT in humans [4.

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