LVOT · respiratory variation calculator
Explore lvot · respiratory variation with the method’s inputs, acquisition guidance and source references. Open the calculator to enter measurements or try an illustrative worked example.
Method
Inspiratory fall = (expiratory value − inspiratory value) / expiratory value × 100
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
LVOT measurement
Enter the measured value in the displayed unit
- Peak velocity
- VTI
- Confirm the variable matches the selected formula.
- Use the unit displayed beside the field.
- Keep measurements from the same representative hemodynamic state.
Expiratory peak Vₑ cm/s
Enter the measured value in the displayed unit
- Confirm the variable matches the selected formula.
- Use the unit displayed beside the field.
- Keep measurements from the same representative hemodynamic state.
Inspiratory peak Vᵢ cm/s
Enter the measured value in the displayed unit
- Confirm the variable matches the selected formula.
- Use the unit displayed beside the field.
- Keep measurements from the same representative hemodynamic state.
Expiratory VTIₑ cm
Enter the measured value in the displayed unit
- Confirm the variable matches the selected formula.
- Use the unit displayed beside the field.
- Keep measurements from the same representative hemodynamic state.
Inspiratory VTIᵢ cm
Enter the measured value in the displayed unit
- Confirm the variable matches the selected formula.
- Use the unit displayed beside the field.
- Keep measurements from the same representative hemodynamic state.
Sources and method context
American Society of Echocardiography · 2013 · Clinical Recommendations for Multimodality Cardiovascular Imaging of Patients with Pericardial Disease · Figure 38, journal p. 990; Doppler flow recordings pp. 988–991
- Method and interpretation · Figure 38, journal p. 990; Doppler flow recordings pp. 988–991
Inspiratory LVOT velocity reduction and respiratory changes in ejection; no standalone numerical cutoff is assigned here.
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.