Pulmonary vascular resistance calculator: echo Doppler method
Review the Doppler inputs, formula and method qualifications used by EchoSuite’s pulmonary vascular resistance tool.
Method
PVR = 10 × TR Vmax ÷ RVOT VTI + 0.16
Use the measurement units shown below. Some fields apply only to a selected method or condition; follow the interactive tool’s method choices. The interactive tool keeps missing measurements incomplete and provides its method-specific results and reference context.
Measurements and acquisition
TR Vmax m/s
CW Doppler through the TR jet
- Search RV inflow, apical four-chamber, and subcostal windows; use the highest well-aligned signal.
- Trace the dense primary edge (‘chin’), not faint overgained noise, and reject truncated triangular envelopes when estimating pressure.
- Average three representative beats; in atrial fibrillation average 5–10 beats and exclude post-pause or post-ectopic velocities.
RVOT VTI cm
PW Doppler just below the pulmonary valve
- From the PA-bifurcation PSAX view, place a 1–2 mm PW sample in the distal RVOT just beneath the pulmonary valve.
- Optimize scale, baseline, wall filter, and beam alignment so the entire systolic envelope is visible.
- Trace the modal envelope for VTI; measure acceleration time from flow onset to peak velocity and interpret cautiously when heart rate is <60 or >100 bpm.
Sources and method context
American Society of Echocardiography · 2025 · Guidelines for the Echocardiographic Assessment of the Right Heart in Adults and Special Considerations in Pulmonary Hypertension · Pulmonary Vascular Resistance section · JASE p. 167
- Equation and thresholds · PVR section and key points · JASE p. 167
The Abbas equation, normal PVR below 1.5 WU, and abnormal PVR above 2.0 WU.
- Clinical limitations · PVR recommendations · JASE p. 167
Unreliability above 8 WU, nonroutine-use recommendation, and the requirement not to substitute echo PVR for invasive hemodynamics.
Catalogue review status: Exact guideline locator mapped · clinical sign-off pending
These pages describe the educational tool. Interpret measurements with the complete clinical context and the method’s acquisition limitations.
Keep exploring
- Apical four chamber acquisition guide · Open in Probe Lab
- RV outflow acquisition guide · Open in Probe Lab
- Parasternal short axis, aortic valve level acquisition guide · Open in Probe Lab
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- Right atrial size calculator and measurement guide
- Right ventricular size calculator and measurement guide
- Right ventricular function calculator: TAPSE, FAC and coupling