1. What is Stroke Volume Index?

Stroke Volume Index (SVI) is a hemodynamic parameter that represents stroke volume normalized to body surface area. It provides a more accurate assessment of cardiac function by accounting for differences in body size.

2. How Does the Calculator Work?

The calculator uses the SVI formula:

Where:

• \( SVI \) — Stroke Volume Index (mL/m²)
• \( SV \) — Stroke Volume (mL)
• \( BSA \) — Body Surface Area (m²)

Explanation: This calculation normalizes stroke volume to body size, allowing for better comparison of cardiac function across individuals of different sizes.

3. Importance of SVI Calculation

Details: SVI is crucial for assessing cardiac performance, diagnosing heart failure, monitoring treatment response, and guiding fluid management in critically ill patients.

4. Using the Calculator

Tips: Enter stroke volume in milliliters (mL) and body surface area in square meters (m²). Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the normal range for SVI?
A: Normal SVI typically ranges from 35-65 mL/m² in adults, though values may vary based on age, gender, and clinical context.

Q2: How is stroke volume measured?
A: Stroke volume can be measured using echocardiography, thermodilution, pulse contour analysis, or Doppler techniques.

Q3: Why normalize to body surface area?
A: Normalizing to BSA accounts for differences in body size, allowing for more accurate comparisons between individuals of different builds.

Q4: What does a low SVI indicate?
A: Low SVI may indicate impaired cardiac function, heart failure, hypovolemia, or other conditions affecting cardiac output.

Q5: How is BSA calculated?
A: BSA is commonly calculated using formulas like Du Bois, Mosteller, or Haycock based on height and weight measurements.