1. What is Stroke Volume?

Stroke Volume (SV) is the volume of blood pumped from the left ventricle per beat. It is a key parameter in assessing cardiac function and is calculated using echocardiographic measurements.

2. How Does the Calculator Work?

The calculator uses the Stroke Volume equation:

Where:

• \( VTI \) — Velocity Time Integral (cm)
• \( LVOT_{area} \) — Left Ventricular Outflow Tract area (cm²)

Explanation: The equation multiplies the distance blood travels in one cardiac cycle (VTI) by the cross-sectional area through which it flows (LVOT area).

3. Importance of Stroke Volume Calculation

Details: Stroke volume measurement is essential for evaluating cardiac output, assessing ventricular function, and monitoring patients with heart conditions.

4. Using the Calculator

Tips: Enter VTI in cm and LVOT area in cm². Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal stroke volume range?
A: Normal stroke volume ranges from 60-100 mL in healthy adults at rest.

Q2: How is VTI measured?
A: VTI is measured using pulsed-wave Doppler echocardiography at the left ventricular outflow tract.

Q3: How is LVOT area calculated?
A: LVOT area is typically calculated as π × (LVOT diameter/2)², measured from a parasternal long-axis view.

Q4: What factors affect stroke volume?
A: Preload, afterload, contractility, and heart rate all influence stroke volume.

Q5: Can this calculation be used for right ventricular stroke volume?
A: A similar principle applies but uses right ventricular outflow tract measurements instead.