This calculator helps respiratory care practitioners adjust ventilation parameters based on arterial carbon dioxide (PaCO2) levels. When a patient's PaCO2 is not at the desired level, you can use these calculations to determine new ventilator settings by adjusting either tidal volume, respiratory rate, or both.
Clinical Note: PaCO2 is inversely proportional to alveolar ventilation. To decrease PaCO2, increase ventilation (↑VT, ↑RR, or both). To increase PaCO2, decrease ventilation (↓VT, ↓RR, or both).
Normal range: 12-20 breaths/min
Typical range: 6-8 ml/kg IBW
Minute Ventilation (VE) = Tidal Volume (VT) × Respiratory Rate (RR)
Waiting for input...
New VE = (Current PaCO2 × Current VE) / Desired PaCO2
This calculates the exact minute ventilation needed to achieve your desired PaCO2
Waiting for input...
New RR = (Current PaCO2 × Current RR) / Desired PaCO2
Keeps tidal volume constant while adjusting rate
Waiting for calculation...
New VT = (Current PaCO2 × Current VT) / Desired PaCO2
Keeps respiratory rate constant while adjusting volume
Waiting for calculation...