1. What is Pulmonary Artery Systolic Pressure?

Pulmonary artery systolic pressure (sPAP) is the pressure in the pulmonary artery during systole. It's used to assess pulmonary hypertension and right heart function. The equation estimates sPAP from echocardiographic measurements.

2. How Does the Calculator Work?

The calculator uses the sPAP equation:

Where:

• \( TRV \) — Tricuspid regurgitant velocity (m/s)
• \( RAP \) — Right atrial pressure (mmHg)

Explanation: The equation estimates pulmonary artery pressure based on the velocity of tricuspid regurgitation and estimated right atrial pressure.

3. Importance of sPAP Calculation

Details: sPAP estimation is crucial for diagnosing pulmonary hypertension, assessing right heart function, and guiding treatment decisions in cardiopulmonary diseases.

4. Using the Calculator

Tips: Enter TRV in m/s (typically 2.6-3.4 m/s in pulmonary hypertension) and RAP in mmHg (typically 3-15 mmHg). All values must be valid (TRV > 0, RAP ≥ 0).

5. Frequently Asked Questions (FAQ)

Q1: What is a normal sPAP value?
A: Normal sPAP is typically 15-30 mmHg. Values >35 mmHg at rest suggest pulmonary hypertension.

Q2: How accurate is this estimation?
A: The estimation correlates well with catheter measurements but may underestimate in severe PH or overestimate with poor TR signals.

Q3: When should RAP be estimated higher?
A: RAP may be increased in cases of right heart failure, volume overload, or pericardial disease.

Q4: Are there limitations to this equation?
A: Accuracy depends on quality of TR signal and RAP estimation. Not reliable when TRV < 2 m/s or with eccentric jets.

Q5: What other measurements are important?
A: RV size/function, pulmonary artery dimensions, and other Doppler parameters provide additional important information.