Stroke Volume Index (SVi) for RV Failure Prediction Calculator
- Stroke Volume Index (SVi) for RV Failure Prediction: Explanation and Clinical Context
Stroke Volume Index (SVi) is a hemodynamic parameter that represents the stroke volume normalized to body surface area. It is calculated as cardiac output divided by heart rate and then indexed to BSA, providing a load-adjusted measure of cardiac performance.
In the context of right ventricular (RV) failure prediction, SVi has been shown to be a strong indicator of RV function, especially in patients undergoing left ventricular assist device (LVAD) implantation, cardiac surgery, or advanced heart failure management. A low SVi reflects compromised forward flow and poor RV contractility.
Typical Reference Values:
• Normal SVi: ≥ 35 mL/m²/beat
• Borderline: 25–35 mL/m²/beat
• High Risk (Severe RV Dysfunction): < 25 mL/m²/beat
Clinical Significance:
A reduced SVi indicates decreased right ventricular stroke work and correlates with increased central venous pressure and poor pulmonary artery coupling. In perioperative and critical care settings, SVi < 25 mL/m²/beat is a marker for poor prognosis and impending RV failure, especially after cardiac surgery or LVAD implantation.
Clinical Interpretation Summary:
• SVi < 25 mL/m²/beat → High risk of RV failure; requires optimization of preload, afterload reduction, and inotropic support.
• 25 ≤ SVi ≤ 35 → Intermediate risk; monitor closely with echocardiography and hemodynamic trends.
• SVi > 35 → Low risk; suggests preserved RV performance.
Reference:
- Kukucka M, Stepanenko A, Potapov E, et al. "Stroke Volume Index as Predictor of Right Ventricular Failure after Left Ventricular Assist Device Implantation." J Heart Lung Transplant. 2015;34(5):682–689. doi:10.1016/j.healun.2014.11.013
- Haddad F, Doyle R, Murphy DJ, Hunt SA. "Right Ventricular Function in Cardiovascular Disease, Part II: Pathophysiology, Clinical Importance, and Management of Right Ventricular Failure." Circulation. 2008;117(13):1717–1731. doi:10.1161/CIRCULATIONAHA.107.653584
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