1. What is the Pulmonary Artery Pulsatility Index (PAPi)?

The Pulmonary Artery Pulsatility Index (PAPi) is a hemodynamic parameter calculated from right heart catheterization measurements. It assesses right ventricular function and is particularly useful in predicting outcomes in patients with heart failure, pulmonary hypertension, and following cardiac surgery.

2. How Does the Calculator Work?

The calculator uses the PAPi formula:

Where:

• \( sPAP \) — Systolic Pulmonary Artery Pressure (mmHg)
• \( dPAP \) — Diastolic Pulmonary Artery Pressure (mmHg)
• \( RAP \) — Right Atrial Pressure (mmHg)

Explanation: The formula calculates the pulsatility of the pulmonary artery by dividing the pulmonary artery pulse pressure (sPAP - dPAP) by the right atrial pressure.

3. Importance of PAPi Calculation

Details: PAPi is a valuable prognostic indicator in various cardiac conditions. Lower PAPi values (<1.0) are associated with worse outcomes in heart failure patients and are predictive of right ventricular failure following left ventricular assist device implantation.

4. Using the Calculator

Tips: Enter all pressure values in mmHg. These values are typically obtained through right heart catheterization. All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal PAPi value?
A: A normal PAPi is typically greater than 2.0. Values below 1.0 are considered abnormal and may indicate impaired right ventricular function.

Q2: How is PAPi used clinically?
A: PAPi is used to assess right ventricular function, predict outcomes in heart failure patients, guide management in pulmonary hypertension, and assess risk prior to cardiac surgery or device implantation.

Q3: What are the limitations of PAPi?
A: PAPi requires invasive measurement through right heart catheterization. It may be affected by various factors including volume status, tricuspid regurgitation, and respiratory variations.

Q4: Can PAPi be used in children?
A: While the formula is the same, normal values and clinical implications may differ in pediatric populations. Consultation with a pediatric cardiologist is recommended for interpretation in children.

Q5: How often should PAPi be measured?
A: The frequency of measurement depends on the clinical context. It's typically measured during right heart catheterization procedures which are performed based on clinical indication rather than at regular intervals.