Advanced
Technical
IVT
systemic vascular resistance index
Also written as: SVRI — Systemic Vascular Resistance Index
Body surface area-indexed measurement of afterload against which the left ventricle must pump.
Full Definition
A calculated hemodynamic parameter that represents systemic vascular resistance adjusted for body surface area, expressed in dynes·sec·cm⁻⁵·m². It is calculated as (mean arterial pressure minus central venous pressure) × 80 ÷ cardiac index. SVRI provides a more accurate assessment of afterload in patients of different sizes and is particularly useful in pediatric cardiac surgery and when comparing hemodynamic states over time. Normal values range from 1970-2390 dynes·sec·cm⁻⁵·m².
Usage
Usage note: Include units (dynes·sec·cm⁻⁵·m²) when reporting numerical values.
In Context
- "The patient's systemic vascular resistance index remained elevated at 3200 despite adequate anesthesia depth." — Hemodynamic assessment
- "Post-bypass SVRI calculation showed appropriate afterload reduction with the vasodilator infusion." — Anesthesia record
Also known as
SVRI
indexed afterload
Don't confuse with
systemic vascular resistance
pulmonary vascular resistance index