Pulmonary Artery Pulse Index Calculator

PAPi Formula:

\[ PAPi = \frac{sPAP - dPAP}{RAP} \]

Systolic Pulmonary Artery Pressure (sPAP):

mmHg

Diastolic Pulmonary Artery Pressure (dPAP):

mmHg

Right Atrial Pressure (RAP):

mmHg

Pulmonary Artery Pulsatility Index (PAPi):

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1. What is Pulmonary Artery Pulsatility Index?

The Pulmonary Artery Pulsatility Index (PAPi) is a hemodynamic parameter that assesses right ventricular function by measuring the pulsatility of pulmonary artery pressure. It's calculated as the ratio of pulmonary artery pulse pressure to right atrial pressure.

2. How Does the Calculator Work?

The calculator uses the PAPi formula:

\[ PAPi = \frac{sPAP - dPAP}{RAP} \]

Where:

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

Explanation: The equation calculates the pulsatility index by dividing the pulmonary artery pulse pressure (difference between systolic and diastolic pressures) by the right atrial pressure.

3. Importance of PAPi Calculation

Details: PAPi is a valuable prognostic marker in heart failure patients, particularly for assessing right ventricular function and predicting outcomes in various cardiac conditions including myocardial infarction and pulmonary hypertension.

4. Using the Calculator

Tips: Enter systolic and diastolic pulmonary artery pressures and right atrial pressure in mmHg. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal PAPi value?
A: Normal PAPi values typically range from 1.0 to 3.0. Values below 1.0 may indicate right ventricular dysfunction.

Q2: How is PAPi used clinically?
A: PAPi is used to assess right ventricular function, predict outcomes in heart failure, and guide management in various cardiac conditions.

Q3: When should PAPi be measured?
A: PAPi is typically measured during right heart catheterization procedures in patients with suspected or known cardiac conditions.

Q4: Are there limitations to PAPi measurement?
A: PAPi accuracy depends on precise pressure measurements and may be affected by various factors including respiratory variations and technical aspects of measurement.

Q5: How does PAPi relate to other cardiac indices?
A: PAPi complements other hemodynamic parameters like cardiac output, pulmonary capillary wedge pressure, and right ventricular stroke work index in comprehensive cardiac assessment.