Pulmonary Vascular Resistance Calculation Formula

Pulmonary vascular resistance (PVR) is the resistance against blood flow from the pulmonary artery to the left atrium. 

PVR can be calculated by subtracting the left atrial pressure from the mean pulmonary artery pressure (PAP), divided by the pulmonary flow and multiplied by 80.

PVR = {(Mean Pulmonary Artery Pressure – Left Atrial Pressure) ÷ Pulmonary Flow} × 80


  • In most cases Pulmonary Flow is equivalent to the cardiac output.
  • Normal PVR is approximately 37 to 250 dynes/sec/cm^-5.

For example:

If a patient's mean pulmonary artery pressure is 14 mmHg, his left atrial pressure is 8 mmHg, and his cardiac output is 4.0 L/minute, his PVR would be 120 dynes/sec/cm-5.

PVR = {(14 - 8) ÷ 4} × 80 = 120 dynes/sec/cm^-5


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