Diastolic Pulmonary Gradient Calculator

Diastolic Pulmonary Gradient Equation:

\[ Gradient = 4 \times (TR Velocity)^2 \]

Pressure Gradient:

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1. What is the Diastolic Pulmonary Gradient?

The Diastolic Pulmonary Gradient estimates pressure gradient across the pulmonary valve using the simplified Bernoulli equation from echocardiography. It is calculated from tricuspid regurgitation (TR) velocity and provides important hemodynamic information about right ventricular pressure.

2. How Does the Calculator Work?

The calculator uses the simplified Bernoulli equation:

\[ Gradient = 4 \times (TR Velocity)^2 \]

Where:

\( TR Velocity \) — Tricuspid regurgitation velocity measured by echocardiography (m/s)
\( 4 \) — Constant in the simplified Bernoulli equation

Explanation: The equation converts velocity measurements into pressure gradients, providing an estimate of the pressure difference across the pulmonary valve.

3. Importance of Pressure Gradient Calculation

Details: Accurate pressure gradient estimation is crucial for assessing pulmonary valve function, diagnosing pulmonary hypertension, and evaluating right ventricular hemodynamics in various cardiac conditions.

4. Using the Calculator

Tips: Enter TR velocity in meters per second (m/s) as measured by Doppler echocardiography. The value must be greater than 0 for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the clinical significance of diastolic pulmonary gradient?
A: It helps assess pulmonary valve stenosis severity, monitor pulmonary hypertension, and guide treatment decisions in various cardiac conditions.

Q2: What are normal TR velocity values?
A: Normal TR velocity is typically 2.0-2.5 m/s, corresponding to a gradient of 16-25 mmHg. Values above 2.8 m/s may indicate elevated right ventricular pressure.

Q3: When is this calculation most useful?
A: Particularly valuable in evaluating patients with suspected pulmonary hypertension, right ventricular dysfunction, or pulmonary valve disease.

Q4: Are there limitations to this equation?
A: The simplified Bernoulli equation assumes negligible proximal velocity and may be less accurate with very high gradients or in the presence of significant proximal flow acceleration.

Q5: How does this relate to pulmonary artery pressure?
A: The calculated gradient, when added to estimated right atrial pressure, provides an estimate of pulmonary artery systolic pressure.