1. What is Stroke Volume Calculation?

Stroke Volume (SV) is the volume of blood pumped from the left ventricle per beat. It is a crucial parameter in echocardiography for assessing cardiac function and output.

2. How Does the Calculator Work?

The calculator uses the Stroke Volume equation:

Where:

• \( LVOT \ area \) — Left ventricular outflow tract area (cm²)
• \( VTI \) — Velocity time integral (cm)

Explanation: The equation calculates the volume of blood ejected with each heartbeat by multiplying the cross-sectional area of the LVOT by the distance blood travels during systole.

3. Importance of Stroke Volume Measurement

Details: Accurate stroke volume measurement is essential for evaluating cardiac performance, diagnosing heart conditions, monitoring treatment effectiveness, and calculating cardiac output.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

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

Q2: How is LVOT area measured?
A: LVOT diameter is measured in the parasternal long-axis view during early systole, and area is calculated as π×(diameter/2)².

Q3: Where is VTI measured?
A: VTI is obtained by tracing the spectral Doppler envelope of LVOT flow from the apical 5-chamber or 3-chamber view.

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

Q5: How does stroke volume relate to cardiac output?
A: Cardiac output = Stroke Volume × Heart Rate, making SV a fundamental component of overall cardiac performance assessment.