Stroke Volume Calculator Tte

Stroke Volume Formula:

\[ Stroke Volume = \pi \times \left(\frac{LVOT Diameter}{2}\right)^2 \times VTI \]

Stroke Volume:

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1. What is Stroke Volume?

Stroke Volume is the amount of blood pumped by the left ventricle of the heart in one contraction. It is an important hemodynamic parameter used to assess cardiac function and calculate cardiac output.

2. How Does the Calculator Work?

The calculator uses the Doppler echocardiography formula:

\[ Stroke Volume = \pi \times \left(\frac{LVOT Diameter}{2}\right)^2 \times VTI \]

Where:

\( \pi \) — Mathematical constant (approximately 3.14159)
\( LVOT Diameter \) — 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 during systole (VTI) to determine stroke volume.

3. Importance of Stroke Volume Measurement

Details: Stroke volume measurement is crucial for assessing cardiac performance, diagnosing heart failure, monitoring response to therapy, and calculating cardiac output (Stroke Volume × Heart Rate).

4. Using the Calculator

Tips: Enter LVOT diameter and VTI values in centimeters. Both values must be positive numbers. Accurate measurement of LVOT diameter is critical 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, but varies with body size, age, and fitness level.

Q2: How is LVOT diameter measured?
A: LVOT diameter is typically measured in the parasternal long-axis view during echocardiography, from the inner edge to inner edge at the aortic annulus level.

Q3: What is VTI and how is it obtained?
A: VTI (Velocity Time Integral) is the integral of the systolic velocity curve obtained by pulsed-wave Doppler in the LVOT. It represents the distance blood travels during systole.

Q4: What are limitations of this calculation?
A: Accuracy depends on precise measurement of LVOT diameter (squared in the formula), assumption of circular LVOT geometry, and optimal Doppler alignment.

Q5: How does stroke volume relate to cardiac output?
A: Cardiac output = Stroke Volume × Heart Rate. Stroke volume is a key component in determining the heart's pumping efficiency.