Pulmonary Vascular Resistance (PVR) Calculator

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The average pressure in the pulmonary artery over a full cardiac cycle. Normal is 10-20 mmHg.
mmHg
Also called pulmonary artery wedge pressure (PAWP); used as a surrogate for left atrial pressure. Normal is 6-12 mmHg.
mmHg
Volume of blood the heart pumps per minute. Normal adult resting value is 4-8 L/min.
L/min
PVR (Wood units)Normal
1.82WU

Standard clinical unit for pulmonary vascular resistance (mmHg·min/L)

PVR (dynes·sec/cm⁵)145dynes·sec/cm⁵
Transpulmonary Gradient10mmHg
1.82 WU
Low-normal<1Normal1-2Mild2-3Moderate3-5Significant5-8Severe8+

PVR is 1.82 WU - within the normal range.

  • Normal pulmonary vascular resistance indicates that the pulmonary vasculature is not causing significant right ventricular afterload.
  • A transpulmonary gradient of 10.0 mmHg is within a typical range for this PVR.
  • In CGS units this equals 145 dynes·sec/cm⁵ (multiply Wood units by 80).

Next stepInterpret PVR alongside MPAP, cardiac output, right heart function on echocardiography, and the clinical picture. A single measurement is insufficient for diagnosis.

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