SVR
Also written as: SVR — Systemic Vascular Resistance
Systemic vascular resistance; the total resistance to blood flow in the systemic circulation, calculated from hemodynamic measurements.
Full Definition
Systemic vascular resistance represents the total peripheral resistance offered by the systemic vasculature to blood flow from the left ventricle. It is calculated using the formula: SVR = 80 × (MAP - CVP) / CO, where MAP is mean arterial pressure, CVP is central venous pressure, and CO is cardiac output. Normal values range from 800-1200 dynes·sec/cm⁵. In cardiac anesthesia, SVR monitoring helps guide vasopressor and vasodilator therapy, particularly during separation from cardiopulmonary bypass.
Usage
Usage note: Do not confuse with PVR (pulmonary vascular resistance).
In Context
- "The patient's elevated SVR of 1800 required immediate vasodilator therapy." — Hemodynamic report
- "Post-bypass vasoplegia was evident from the markedly reduced SVR despite adequate cardiac output." — Operative note