SVR
Also written as: SVR — Systemic Vascular Resistance
A calculated parameter representing the resistance to blood flow in the systemic circulation.
Full Definition
Systemic Vascular Resistance is a hemodynamic parameter calculated from mean arterial pressure, central venous pressure, and cardiac output, representing the afterload against which the left ventricle must pump. In pediatric critical care, SVR is used to assess vascular tone and guide vasopressor or vasodilator therapy. Normal values vary significantly with age, and the systemic vascular resistance index (SVRI) is often used to account for body surface area differences in children.
Usage
Usage note: Include units when reporting specific values; distinguish from SVRI (indexed to body surface area).
In Context
- "The patient's SVR was elevated at 2400 dynes⋅sec⋅cm⁻⁵, indicating high afterload." — Hemodynamic assessment
- "Milrinone was started to reduce SVR and improve cardiac output." — Treatment plan