1. What is Pulmonary Artery Systolic Pressure (PASP)?

Definition: PASP is the pressure in the pulmonary artery during heart contraction (systole), estimated using echocardiography.

Purpose: This non-invasive measurement helps assess pulmonary hypertension and right heart function.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{PASP} \) — Pulmonary artery systolic pressure (mmHg)
• \( \text{TRV} \) — Tricuspid regurgitation velocity (m/s)
• \( \text{RAP} \) — Right atrial pressure (mmHg, typically estimated as 5-15 mmHg)

Explanation: The Bernoulli equation converts TRV to pressure gradient, which is added to RAP to estimate PASP.

3. Clinical Importance of PASP

Details: PASP helps diagnose pulmonary hypertension (normal < 25 mmHg, mild 25-40 mmHg, moderate 40-55 mmHg, severe > 55 mmHg).

4. Using the Calculator

Tips: Enter TRV from echocardiography and estimated RAP (default 5 mmHg). All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this PASP estimation?
A: It provides a reasonable estimate but may differ from invasive measurements by ±10 mmHg.

Q2: What's a typical RAP value?
A: Usually 5 mmHg (normal), 10 mmHg (mild elevation), or 15 mmHg (significant elevation) based on IVC assessment.

Q3: When is this calculation not valid?
A: With poor TRV Doppler signals, severe TR, or pulmonary stenosis.

Q4: What TRV value suggests pulmonary hypertension?
A: TRV > 2.8 m/s suggests possible PH (PASP > 36 mmHg with RAP=5).

Q5: How does this relate to right ventricular systolic pressure (RVSP)?
A: In absence of pulmonary stenosis, PASP ≈ RVSP.