Canonical: https://echosuite.app/guides/pulmonic-regurg/

# Pulmonic regurgitation · continuity calculator

Explore pulmonic regurgitation · continuity with the method’s inputs, acquisition guidance and source references. Open the calculator to enter measurements or try an illustrative worked example.

Created by [Mohammed Kamareddine, MD](https://echosuite.app/about/) · [Sources & educational scope](https://echosuite.app/about/)

[Open interactive calculator →](https://echosuite.app/calculators/#pulmonic-regurg)

## Method

RVol = RVOT SV − LVOT SV; RF = RVol ÷ RVOT SV

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

### RVOT diameter  cm

2D echo · inner-edge measurement

- Use the specified view and cardiac phase.
- Align the calipers perpendicular to the structure’s long axis.
- Measure inner edge to inner edge and avoid oblique foreshortening.

### RVOT VTI  cm

Pulsed-wave Doppler

- Place the sample volume at the specified annulus or outflow tract.
- Align the Doppler beam with flow and record a clean envelope.
- Trace the modal velocity envelope and use the reported VTI.

### LVOT diameter  cm

2D echo · inner-edge measurement

- Use the specified view and cardiac phase.
- Align the calipers perpendicular to the structure’s long axis.
- Measure inner edge to inner edge and avoid oblique foreshortening.

### LVOT VTI  cm

Pulsed-wave Doppler

- Place the sample volume at the specified annulus or outflow tract.
- Align the Doppler beam with flow and record a clean envelope.
- Trace the modal velocity envelope and use the reported VTI.

### PR pressure half-time  ms

CW Doppler deceleration slope · Optional

- Record a complete inflow or regurgitant CW envelope.
- Trace the deceleration slope using the machine PHT tool.
- Average representative beats and use additional beats in atrial fibrillation.

## Sources and method context

American Society of Echocardiography · 2017 · Recommendations for Noninvasive Evaluation of Native Valvular Regurgitation · PR acquisition and quantitation pp. 52–55 · Table 15 pp. 52–53 · Table 16 p. 56 · Figure 35 p. 57

[Primary reference](https://www.asecho.org/wp-content/uploads/2017/04/2017VavularRegurgitationGuideline.pdf)

- Continuity calculation & acquisition · PR section pp. 52–55 · Table 15 pp. 52–53

RVOT stroke-volume acquisition, subtraction of competent reference flow, regurgitant-fraction calculation, and limitations from diameter, VTI, rhythm, shunts, and additional regurgitant lesions.

- Quantitative and severe-supportive findings · Table 16 · PDF p. 56

Regurgitant-fraction ranges, jet-width ratio, branch pulmonary-artery flow reversal, and pressure half-time shorter than 100 ms as a severe-supportive finding.

- Integration & limitations · Table 16 p. 56 · Figure 35 and integrative pathway p. 57

Limited echocardiographic validation of quantitative PR, load dependence of pressure half-time, RV remodeling, and indeterminate classification when findings or data quality are discordant.

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

- [Aortic regurgitation PISA calculator](https://echosuite.app/guides/ar-pisa/)
- [Aortic regurgitation calculator: continuity method](https://echosuite.app/guides/ar-continuity/)
- [Mitral regurgitation PISA calculator: EROA and regurgitant volume](https://echosuite.app/guides/mr-pisa/)
- [Mitral regurgitation calculator: continuity method](https://echosuite.app/guides/mr-continuity/)

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