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Understand the result,
not just the number.
RVOT VTI Cardiac Output Estimation in Pulmonary Hypertension: Explanation and Clinical Context RVOT VTI (Right Ventricular Outflow Tract Velocity Time Integral) is a Doppler echocardiography parameter used to estimate stroke volume and cardiac output, particularly in patients with pulmonary hypertension (PH). The stroke volume is calculated as the product of the RVOT cross-sectional area and the VTI, then multiplied by the heart rate to estimate cardiac output in liters per minute. This approach is based on standard echocardiographic formulas validated in PH populations.
Normal stroke volume ranges from approximately 60-100 mL, and normal cardiac output is typically 4-8 L/min, though values may vary in PH patients depending on right ventricular function. This tool helps clinicians estimate hemodynamic status non-invasively and monitor treatment response in pulmonary hypertension.
Evidence & references1 primary source mapped
- Source 1
Lang RM, et al. Recommendations for Cardiac Chamber Quantification by Echocardiography in Adults: An Update from the American Society of Echocardiography and the European Association of Cardiovascular Imaging. J Am Soc Echocardiogr. 2015;28(1):1-39. doi:10.1016/j.echo.2014.10.003
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