1. What is Left Ventricular Stroke Volume?

Left Ventricular Stroke Volume (SV) is the volume of blood pumped from the left ventricle per beat. It is a crucial hemodynamic parameter used to assess cardiac function and output.

2. How Does the Calculator Work?

The calculator uses the stroke volume equation:

Where:

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

Explanation: The equation calculates the cross-sectional area of the LVOT and multiplies it by the VTI to determine the volume of blood ejected per heartbeat.

3. Importance of Stroke Volume Calculation

Details: Stroke volume measurement is essential for evaluating cardiac performance, diagnosing heart conditions, monitoring treatment effectiveness, and assessing overall cardiovascular health.

4. Using the Calculator

Tips: Enter LVOT Diameter in centimeters and VTI in centimeters. 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 typically ranges from 60-100 mL in healthy adults at rest.

Q2: How is LVOT diameter measured?
A: LVOT diameter is typically measured using echocardiography in the parasternal long-axis view during systole.

Q3: What factors affect stroke volume?
A: Preload, afterload, contractility, heart rate, and ventricular function all influence stroke volume.

Q4: How is VTI obtained?
A: VTI is measured using pulsed-wave Doppler echocardiography at the LVOT, tracing the spectral Doppler envelope.

Q5: Can this calculation be used for right ventricular stroke volume?
A: No, this specific equation is for left ventricular stroke volume. Right ventricular calculations use different measurements (usually pulmonary artery or right ventricular outflow tract).