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 standard echocardiography formula:

Where:

• \( SV \) — Stroke Volume (mL)
• \( \pi \) — Mathematical constant pi (≈3.14159)
• \( LVOT \) — Left Ventricular Outflow Tract diameter (cm)
• \( VTI \) — Velocity Time Integral (cm)

Explanation: The formula calculates the cross-sectional area of the LVOT and multiplies it by the distance blood travels per beat (VTI) to determine stroke volume.

3. Importance of Stroke Volume Measurement

Details: Accurate stroke volume measurement is essential for assessing cardiac performance, diagnosing heart failure, monitoring treatment response, and calculating cardiac output.

4. Using the Calculator

Tips: Enter LVOT diameter in centimeters and VTI in centimeters. Ensure accurate measurements from echocardiographic images for reliable results.

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 diameter measured?
A: LVOT diameter is typically measured in the parasternal long-axis view during early systole, just below the aortic valve.

Q3: What is VTI and how is it obtained?
A: Velocity Time Integral is the integral of the velocity curve over time, obtained by tracing the spectral Doppler envelope across the aortic valve.

Q4: What are common sources of error in this calculation?
A: Errors can arise from inaccurate LVOT diameter measurement, improper Doppler beam alignment, and failure to account for angle correction.

Q5: Can this method be used for right ventricular stroke volume?
A: Yes, similar principles apply using pulmonary artery diameter and pulmonary valve VTI measurements.